41. Given:
10. class One {
11. public One foo() { return this; }
12. }
13. class Two extends One {
14. public One foo() { return this; }
15. }
16. class Three extends Two {
17. // insert method here
18. }
Which two methods, inserted individually, correctly complete the Three class? (Choose two.)
A. public void foo() {}
B. public int foo() { return 3; }
C. public Two foo() { return this; }
D. public One foo() { return this; }
E. public Object foo() { return this; }
Answer: CD
42. Given:
10. class One {
11. void foo() { }
12. }
13. class Two extends One {
14. //insert method here
15. }
Which three methods, inserted individually at line 14, will correctly complete class Two? (Choose three.)
A. int foo() { /* more code here */ }
B. void foo() { /* more code here */ }
C. public void foo() { /* more code here */ }
D. private void foo() { /* more code here */ }
E. protected void foo() { /* more code here */ }
Answer: BCE
45. Given:
1. public class A {
2. public void doit() {
3. }
4. public String doit() {
5. return "a";
6. }
7. public double doit(int x) {
8. return 1.0;
9. }
10. }
What is the result?
A. An exception is thrown at runtime.
B. Compilation fails because of an error in line 7.
C. Compilation fails because of an error in line 4.
D. Compilation succeeds and no runtime errors with class A occur.
Answer: C
46. Given:
10. class Line {
11. public static class Point {}
12. }
13.
14. class Triangle {
15. // insert code here
16. }
Which code, inserted at line 15, creates an instance of the Point class defined in Line?
A. Point p = new Point();
B. Line.Point p = new Line.Point();
C. The Point class cannot be instatiated at line 15.
D. Line l = new Line() ; l.Point p = new l.Point();
Answer: B
47. Given:
10. class Line {
11. public class Point { public int x,y;}
12. public Point getPoint() { return new Point(); }
13. }
14. class Triangle {
15. public Triangle() {
16. // insert code here
17. }
18. }
Which code, inserted at line 16, correctly retrieves a local instance of a Point object?
A. Point p = Line.getPoint();
B. Line.Point p = Line.getPoint();
C. Point p = (new Line()).getPoint();
D. Line.Point p = (new Line()).getPoint();
Answer: D
48. Given:
10. class One {
11. public One() { System.out.print(1); }
12. }
13. class Two extends One {
14. public Two() { System.out.print(2); }
15. }
16. class Three extends Two {
17. public Three() { System.out.print(3); }
18. }
19. public class Numbers{
20. public static void main( String[] argv ) { new Three(); }
21. }
What is the result when this code is executed?
A. 1
B. 3
C. 123
D. 321
E. The code runs with no output.
Answer: C
49. Click the Exhibit button.
11. class Person {
12. String name = "No name";
13. public Person(String nm) { name = nm; }
14. }
15.
16. class Employee extends Person {
17. String empID = "0000";
18. public Employee(String id) { empID = id; }
19. }
20.
21. public class EmployeeTest {
22. public static void main(String[] args) {
23. Employee e = new Employee("4321");
24. System.out.println(e.empID);
25. }
26. }
What is the result?
A. 4321
B. 0000
C. An exception is thrown at runtime.
D. Compilation fails because of an error in line 18.
Answer: D
50. Given:
1. public class Plant {
2. private String name;
3. public Plant(String name) { this.name = name; }
4. public String getName() { return name; }
5. }
1. public class Tree extends Plant {
2. public void growFruit() { }
3. public void dropLeaves() { }
4. }
Which is true?
A. The code will compile without changes.
B. The code will compile if public Tree() { Plant(); } is added to the Tree class.
C. The code will compile if public Plant() { Tree(); } is added to the Plant class.
D. The code will compile if public Plant() { this("fern"); } is added to the Plant class.
E. The code will compile if public Plant() { Plant("fern"); } is added to the Plant class.
Answer: D
51. Click the Exhibit button.
11. public class Bootchy {
12. int bootch;
13. String snootch;
14.
15. public Bootchy() {
16. this("snootchy");
17. System.out.print("first ");
18. }
19.
20. public Bootchy(String snootch) {
21. this(420, "snootchy");
22. System.out.print("second ");
23. }
24.
25. public Bootchy(int bootch, String snootch) {
26. this.bootch = bootch;
27. this.snootch = snootch;
28. System.out.print("third ");
29. } 30.
31. public static void main(String[] args) {
32. Bootchy b = new Bootchy();
33. System.out.print(b.snootch + " " + b.bootch);
34. }
35. }
What is the result?
A. snootchy 420 third second first
B. snootchy 420 first second third
C. first second third snootchy 420
D. third second first snootchy 420
E. third first second snootchy 420
F. first second first third snootchy 420
Answer: D
52. Given:
11. public class Test {
12. public enum Dogs {collie, harrier, shepherd};
13. public static void main(String [] args) {
14. Dogs myDog = Dogs.shepherd;
15. switch (myDog) {
16. case collie:
17. System.out.print("collie ");
18. case default:
19. System.out.print("retriever ");
20. case harrier:
21. System.out.print("harrier ");
22. }
23. }
24. }
What is the result?
A. harrier
B. shepherd
C. retriever
D. Compilation fails.
E. retriever harrier
F. An exception is thrown at runtime.
Answer: D
53. Given:
12. public class Test {
13. public enum Dogs {collie, harrier};
14. public static void main(String [] args) {
15. Dogs myDog = Dogs.collie;
16. switch (myDog) {
17. case collie:
18. System.out.print("collie ");
19. case harrier:
20. System.out.print("harrier ");
21. }
22. }
23. }
What is the result?
A. collie
B. harrier
C. Compilation fails.
D. collie harrier
E. An exception is thrown at runtime.
Answer: D
54. Given:
11. public void testIfA() {
12. if (testIfB("True")) {
13. System.out.println("True");
14. } else {
15. System.out.println("Not true");
16. } 17. }
18. public Boolean testIfB(String str) {
19. return Boolean.valueOf(str);
20. }
What is the result when method testIfA is invoked?
A. True
B. Not true
C. An exception is thrown at runtime.
D. Compilation fails because of an error at line 12.
E. Compilation fails because of an error at line 19.
Answer: A
55. Given:
11. public static void main(String[] args) {
12. Integer i = new Integer(1) + new Integer(2);
13. switch(i) {
14. case 3: System.out.println("three"); break;
15. default: System.out.println("other"); break;
16. }
17. }
What is the result?
A. three
B. other
C. An exception is thrown at runtime.
D. Compilation fails because of an error on line 12.
E. Compilation fails because of an error on line 13.
F. Compilation fails because of an error on line 15.
Answer: A
56. Given:
11. public static void main(String[] args) {
12. String str = "null";
13. if (str == null) {
14. System.out.println("null");
15. } else (str.length() == 0) {
16. System.out.println("zero");
17. } else {
18. System.out.println("some");
19. }
20. }
What is the result?
A. null
B. zero
C. some
D. Compilation fails.
E. An exception is thrown at runtime.
Answer: D
57. Given:
11. Float pi = new Float(3.14f);
12. if (pi > 3) {
13. System.out.print("pi is bigger than 3. ");
14. }
15. else {
16. System.out.print("pi is not bigger than 3. ");
17. }
18. finally {
19. System.out.println("Have a nice day.");
20. }
What is the result?
A. Compilation fails.
B. pi is bigger than 3.
C. An exception occurs at runtime.
D. pi is bigger than 3. Have a nice day.
E. pi is not bigger than 3. Have a nice day.
Answer: A
58. Given:
10. int x = 0;
11. int y = 10;
12. do {
310-055
http://www.hotcerts.com - 21 -
13. y--;
14. ++x;
15. } while (x <>
21. Given: 11. public abstract class Shape { 12. int x; 13. int y; 14. public abstract void draw(); 15. public void setAnchor(int x, int y) { 16. this.x = x; 17. this.y = y; 18. } 19. } and a class Circle that extends and fully implements the Shape class. Which is correct? A. Shape s = new Shape(); s.setAnchor(10,10); s.draw(); B. Circle c = new Shape(); c.setAnchor(10,10); c.draw(); C. Shape s = new Circle(); s.setAnchor(10,10); s.draw(); D. Shape s = new Circle(); s->setAnchor(10,10); s->draw(); E. Circle c = new Circle(); c.Shape.setAnchor(10,10); c.Shape.draw(); Answer: C
22. Given: 10. abstract public class Employee { 11. protected abstract double getSalesAmount(); 12. public double getCommision() { 13. return getSalesAmount() * 0.15; 14. } 15. } 16. class Sales extends Employee { 17. // insert method here 18. } Which two methods, inserted independently at line 17, correctly complete the Sales class? (Choose two.) A. double getSalesAmount() { return 1230.45; } B. public double getSalesAmount() { return 1230.45; } C. private double getSalesAmount() { return 1230.45; } D. protected double getSalesAmount() { return 1230.45; } Answer: BD Your Ad Here 23. Given: 10. interface Data { public void load(); } 11. abstract class Info { public abstract void load(); } A. public class Employee extends Info implements Data { public void load() { /*do something*/ } } B. public class Employee implements Info extends Data { public void load() { /*do something*/ } } C. public class Employee extends Info implements Data public void load(){ /*do something*/ } public void Info.load(){ /*do something*/ } } D. public class Employee implements Info extends Data { public void Data.load(){ /*do something*/ } public void load(){ /*do something*/ } } E. public class Employee implements Info extends Data { public void load(){ /*do something*/ } public void Info.load(){ /*do something*/ } } F. public class Employee extends Info implements Data{ public void Data.load() { /*do something*/ } public void Info.load() { /*do something*/ } } Which class correctly uses the Data interface and Info class? Answer: A
24. Given: 11. public abstract class Shape { 12. private int x; 13. private int y; 14. public abstract void draw(); 15. public void setAnchor(int x, int y) { 16. this.x = x; 17. this.y = y; 18. } 19. } Which two classes use the Shape class correctly? (Choose two.) A. public class Circle implements Shape { private int radius; } B. public abstract class Circle extends Shape { private int radius; } C. public class Circle extends Shape { private int radius; public void draw(); } D. public abstract class Circle implements Shape { private int radius; public void draw(); } E. public class Circle extends Shape { private int radius; public void draw() {/* code here */} } F. public abstract class Circle implements Shape { private int radius; public void draw() { /* code here */ } } Answer: BE Your Ad Here 25. Which two classes correctly implement both the java.lang.Runnable and the java.lang.Clonable interfaces? (Choose two.) A. public class Session implements Runnable, Clonable { public void run(); public Object clone(); } B. public class Session extends Runnable, Clonable { public void run() { /* do something */ } public Object clone() { /* make a copy */ } } C. public class Session implements Runnable, Clonable { public void run() { /* do something */ } public Object clone() { /* make a copy */ } } D. public abstract class Session implements Runnable, Clonable { public void run() { /* do something */ } public Object clone() { /*make a copy */ } } E. public class Session implements Runnable, implements Clonable { public void run() { /* do something */ } public Object clone() { /* make a copy */ } } Answer: CD
26. Click the Exhibit button. 1. public class GoTest { 2. public static void main(String[] args) { 3. Sente a = new Sente(); a.go(); 4. Goban b = new Goban(); b.go(); 5. Stone c = new Stone(); c.go(); 6. } 7. } 8. 9. class Sente implements Go { 10. public void go() { System.out.println("go in Sente."); } 11. } 12. 13. class Goban extends Sente { 14. public void go() { System.out.println("go in Goban"); } 15. } 16. 17. class Stone extends Goban implements Go { } 18. 19. interface Go { public void go(); } What is the result? A. go in Goban go in Sente go in Sente B. go in Sente go in Sente go in Goban C. go in Sente go in Goban go in Goban D. go in Goban go in Goban go in Sente E. Compilation fails because of an error in line 17. Answer: C Your Ad Here 27. Given: 11. public static void parse(String str) { 12. try { 13. float f = Float.parseFloat(str); 14. } catch (NumberFormatException nfe) { 15. f = 0; 16. } finally { 17. System.out.println(f); 18. } 19. } 20. public static void main(String[] args) { 21. parse("invalid"); 22. } What is the result? A. 0.0 B. Compilation fails. C. A ParseException is thrown by the parse method at runtime. D. A NumberFormatException is thrown by the parse method at runtime Answer: B
28. Click the Exhibit button. 1. public class Test { 2. int x = 12; 3. public void method(int x) { 4. x+=x; 5. System.out.println(x); 6. } 7. } Given: 34. Test t = new Test(); 35. t.method(5); What is the output from line 5 of the Test class? A. 5 B. 10 C. 12 D. 17 E. 24 Answer: B Your Ad Here 29. Given: 55. int [] x = {1, 2, 3, 4, 5}; 56. int y[] = x; 57. System.out.println(y[2]); Which is true? A. Line 57 will print the value 2. B. Line 57 will print the value 3. C. Compilation will fail because of an error in line 55. D. Compilation will fail because of an error in line 56. Answer: B
30. Given: 35. String #name = "Jane Doe"; 36. int $age = 24; 37. Double _height = 123.5; 38. double ~temp = 37.5; Which two are true? (Choose two.) A. Line 35 will not compile. B. Line 36 will not compile. C. Line 37 will not compile. D. Line 38 will not compile. Answer: AD Your Ad Here 31. Which two code fragments correctly create and initialize a static array of int elements? (Choose two.) A. static final int[] a = { 100,200 }; B. static final int[] a; static { a=new int[2]; a[0]=100; a[1]=200; } C. static final int[] a = new int[2]{ 100,200 }; D. static final int[] a; static void init() { a = new int[3]; a[0]=100; a[1]=200; } Answer: AB
32. Given: 11. public class Ball{ 12. public enum Color { RED, GREEN, BLUE }; 13. public void foo(){ 14. // insert code here 15. { System.out.println(c); } 16. } 17. } Which code inserted at line 14 causes the foo method to print RED, GREEN, and BLUE? A. for( Color c : Color.values() ) B. for( Color c = RED; c <= BLUE; c++ ) C. for( Color c ; c.hasNext() ; c.next() ) D. for( Color c = Color[0]; c <= Color[2]; c++ ) E. for( Color c = Color.RED; c <= Color.BLUE; c++ ) Answer: A
Your Ad Here 33. Given: 10. public class Fabric 11. public enum Color { 12. RED(0xff0000), GREEN(0x00ff00), BLUE(0x0000ff); 13. private final int rgb; 14. Color( int rgb ) { this.rgb = rgb; } 15. public int getRGB() { return rgb; } 16. }; 17. public static void main( String[] argv ) { 18. // insert code here 19. } 20. } Which two code fragments, inserted independently at line 18, allow the Fabric class to compile? (Choose two.) A. Color skyColor = BLUE; B. Color treeColor = Color.GREEN; C. Color purple = new Color( 0xff00ff ); D. if( RED.getRGB() < BLUE.getRGB() ) {} E. Color purple = Color.BLUE + Color.RED; F. if( Color.RED.ordinal() < Color.BLUE.ordinal() ) } Answer: BF
Your Ad Here 34. Given: 11. public enum Title { 12. MR("Mr."), MRS("Mrs."), MS("Ms."); 13. private final String title; 14. private Title(String t) { title = t; } 15. public String format(String last, String first) { 16. return title + " " + first + " " + last; 17. } 18. } 19. public static void main(String[] args) { 20. System.out.println(Title.MR.format("Doe", "John")); 21. } What is the result? A. Mr. John Doe B. An exception is thrown at runtime. C. Compilation fails because of an error in line 12. D. Compilation fails because of an error in line 15. E. Compilation fails because of an error in line 20. Answer: A Your Ad Here 35. Given: 11. public static void main(String[] args) { 12. Object obj = new int[] { 1, 2, 3 }; 13. int[] someArray = (int[])obj; 14. for (int i : someArray) System.out.print(i + " "); 15. } What is the result? A. 1 2 3 B. Compilation fails because of an error in line 12. C. Compilation fails because of an error in line 13. D. Compilation fails because of an error in line 14. E. A ClassCastException is thrown at runtime. Answer: A Your Ad Here 36. Given 10. class Foo { 11. static void alpha() { /* more code here */ } 12. void beta() { /* more code here */ } 13. } Which two are true? (Choose two.) A. Foo.beta() is a valid invocation of beta(). B. Foo.alpha() is a valid invocation of alpha(). C. Method beta() can directly call method alpha(). D. Method alpha() can directly call method beta(). Answer: BC Your Ad Here 37. A programmer needs to create a logging method that can accept an arbitrary number of arguments. For example, it may be called in these ways: logIt("log message1"); logIt("log message2","log message3"); logIt("log message4","log message5","log message6); Which declaration satisfies this requirement? A. public void logIt(String * msgs) B. public void logIt(String [] msgs) C. public void logIt(String... msgs) D. public void logIt(String msg1, String msg2, String msg3) Answer: C
38. A programmer is designing a class to encapsulate the information about an inventory item. A JavaBeans component is needed to do this. The InventoryItem class has private instance variables to store the item information: 10. private int itemId; 11. private String name; 12. private String description; Which method signature follows the JavaBeans naming standards for modifying the itemId instance variable? A. itemID(int itemId) B. update(int itemId) C. setItemId(int itemId) D. mutateItemId(int itemId) E. updateItemID(int itemId) Answer: C Your Ad Here 39. Click the Exhibit button. 1. public class A { 2. 3. private int counter = 0; 4. 5. public static int getInstanceCount() { 6. return counter; 7. } 8. 9. public A() { 10. counter++; 11. } 12. 13. } Given this code from Class B: 25. A a1 = new A(); 26. A a2 = new A(); 27. A a3 = new A(); 28. System.out.println(A.getInstanceCount()); What is the result? A. Compilation of class A fails. B. Line 28 prints the value 3 to System.out. C. Line 28 prints the value 1 to System.out. D. A runtime error occurs when line 25 executes. E. Compilation fails because of an error on line 28. Answer: A
40. A JavaBeans component has the following field: 11. private boolean enabled; Which two pairs of method declarations follow the JavaBeans standard for accessing this field? (Choose two.) A. public void setEnabled( boolean enabled ) public boolean getEnabled() B. public void setEnabled( boolean enabled ) public void isEnabled() C. public void setEnabled( boolean enabled ) public boolean isEnabled() D. public boolean setEnabled( boolean enabled ) public boolean getEnabled() Answer: AC Your Ad Here
1. Given 11. public interface Status { 12. /* insert code here */ int MY_VALUE = 10; 13. } Which three are valid on line 12? (Choose three.) A. final B. static C. native D. public E. private F. abstract G. protected Answer: ABD
2. Given: 10. public class Bar { 11. static void foo( int... x ) { 12. // insert code here 13. } 14. } Which two code fragments, inserted independently at line 12, will allow the class to compile? (Choose two.) A. foreach( x ) System.out.println(z); B. for( int z : x ) System.out.println(z); C. while( x.hasNext() ) System.out.println(x.next()); D. for( int i=0; i<>
3. Given: 11. public class Test { 12. public static void main(String [] args) { 13. int x = 5; 14. boolean b1 = true; 15. boolean b2 = false; 16. 17. if ((x == 4) && !b2 ) 18. System.out.print("1 "); 19. System.out.print("2 "); 20. if ((b2 = true) && b1 ) 21. System.out.print("3 "); 22. } 23. } What is the result? A. 2 B. 3 C. 1 2 D. 2 3 E. 1 2 3 F. Compilation fails. G. An exception is thrown at runtime. Answer: D
4. Given: 31. // some code here 32. try { 33. // some code here 34. } catch (SomeException se) { 35. // some code here 36. } finally { 37. // some code here 38. } Under which three circumstances will the code on line 37 be executed? (Choose three.) A. The instance gets garbage collected. B. The code on line 33 throws an exception. C. The code on line 35 throws an exception. D. The code on line 31 throws an exception. E. The code on line 33 executes successfully. Answer: BCE
5. Given: 10. interface Foo {} 11. class Alpha implements Foo {} 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main( String[] args ) { 15. Beta x = new Beta(); 16. // insert code here 17. } 18. } Which code, inserted at line 16, will cause a java.lang.ClassCastException? A. Alpha a = x; B. Foo f = (Delta)x; C. Foo f = (Alpha)x; D. Beta b = (Beta)(Alpha)x; Answer: B
6. Given: • d is a valid, non-null Date object • df is a valid, non-null DateFormat object set to the current locale What outputs the current locale's country name and the appropriate version of d's date?
A. Locale loc = Locale.getLocale(); System.out.println(loc.getDisplayCountry() + " " + df.format(d)); B. Locale loc = Locale.getDefault(); System.out.println(loc.getDisplayCountry()+ " " + df.format(d)); C. Locale loc = Locale.getLocale(); System.out.println(loc.getDisplayCountry()+ " " + df.setDateFormat(d)); D. Locale loc = Locale.getDefault(); System.out.println(loc.getDisplayCountry()+ " " + df.setDateFormat(d)); Answer: B
7. Given: 20. public class CreditCard { 21. 22. private String cardID; 23. private Integer limit; 24. public String ownerName; 25. 26. public void setCardInformation(String cardID, 27. String ownerName, 28. Integer limit) { 29. this.cardID = cardID; 30. this.ownerName = ownerName; 31. this.limit = limit; 32. } 33. } Which is true? A. The class is fully encapsulated. B. The code demonstrates polymorphism. C. The ownerName variable breaks encapsulation. D. The cardID and limit variables break polymorphism. E. The setCardInformation method breaks encapsulation. Answer: C
8. Assume that country is set for each class. Given: 10. public class Money { 11. private String country, name; 12. public getCountry() { return country; } 13.} and: 24. class Yen extends Money { 25. public String getCountry() { return super.country; } 26. } 27. 28. class Euro extends Money { 29. public String getCountry(String timeZone) { 30. return super.getCountry(); 31. } 32. } Which two are correct? (Choose two.) A. Yen returns correct values. B. Euro returns correct values. C. An exception is thrown at runtime. D. Yen and Euro both return correct values. E. Compilation fails because of an error at line 25. F. Compilation fails because of an error at line 30. Answer: BE
9. Which Man class properly represents the relationship "Man has a best friend who is a Dog"? A. class Man extends Dog { } B. class Man implements Dog { } C. class Man { private BestFriend dog; } D. class Man { private Dog bestFriend; } E. class Man { private Dog } F. class Man { private BestFriend } Answer: D
10. Given: 11. public class Person { 12. private name; 13. public Person(String name) { 14. this.name = name; 15. } 16. public int hashCode() { 17. return 420; 18. } 19. } Which is true? A. The time to find the value from HashMap with a Person key depends on the size of the map. B. Deleting a Person key from a HashMap will delete all map entries for all keys of type Person. C. Inserting a second Person object into a HashSet will cause the first Person object to be removed as a duplicate. D. The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map. Answer: A
13. Given: 10. package com.sun.scjp; 11. public class Geodetics { 12. public static final double DIAMETER = 12756.32; // kilometers 13. } Which two correctly access the DIAMETER member of the Geodetics class? (Choose two.) A. import com.sun.scjp.Geodetics; public class TerraCarta { public double halfway() { return Geodetics.DIAMETER/2.0; } } B. import static com.sun.scjp.Geodetics; public class TerraCarta{ public double halfway() { return DIAMETER/2.0; } } C. import static com.sun.scjp.Geodetics.*; public class TerraCarta { public double halfway() { return DIAMETER/2.0; } } D. package com.sun.scjp; public class TerraCarta { public double halfway() { return DIAMETER/2.0; } } Answer: AC
14. Given: 10. class Nav{ 11. public enum Direction { NORTH, SOUTH, EAST, WEST } 12. } 13. public class Sprite{ 14. // insert code here 15. } Which code, inserted at line 14, allows the Sprite class to compile? A. Direction d = NORTH; B. Nav.Direction d = NORTH; C. Direction d = Direction.NORTH; D. Nav.Direction d = Nav.Direction.NORTH; Answer: D
15. Given: 10. interface Foo { int bar(); } 11. public class Sprite { 12. public int fubar( Foo foo ) { return foo.bar(); } 13. public void testFoo() { 14. fubar( 15. // insert code here 16. ); 17. } 18. } Which code, inserted at line 15, allows the class Sprite to compile? A. Foo { public int bar() { return 1; } } B. new Foo { public int bar() { return 1; } } C. new Foo() { public int bar() { return 1; } } D. new class Foo { public int bar() { return 1; } } Answer: C
16. Click the Exhibit button. 10. interface Foo { 11. int bar(); 12. }13.14. public class Beta {15.16. class A implements Foo { 17. public int bar() { return 1; } 18 19 20. public int fubar( Foo foo ) { return foo.bar(); } 21. 22. public void testFoo() { 23. 24. class A implements Foo { 25. public int bar() { return 2; } 26. } 27. 28. System.out.println( fubar( new A() ) ); 29. } 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } Which three statements are true? (Choose three.) A. Compilation fails. B. The code compiles and the output is 2. C. If lines 16, 17 and 18 were removed, compilation would fail. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and output would be 1. Answer: BEF
17. Given: 1. package sun.scjp; 2. public enum Color { RED, GREEN, BLUE } 1. package sun.beta; 2. // insert code here 3. public class Beta { 4. Color g = GREEN; 5. public static void main( String[] argv ) 6. { System.out.println( GREEN ); } 7. } The class Beta and the enum Color are in different packages. Which two code fragments, inserted individually at line 2 of the Beta declaration, will allow this code to compile? (Choose two.) A. import sun.scjp.Color.*; B. import static sun.scjp.Color.*; C. import sun.scjp.Color; import static sun.scjp.Color.*; D. import sun.scjp.*; import static sun.scjp.Color.*; E. import sun.scjp.Color; import static sun.scjp.Color.GREEN; Answer: CE 18. Given: 1. public interface A { 2. String DEFAULT_GREETING = "Hello World"; 3. public void method1(); 4. } A programmer wants to create an interface called B that has A as its parent. Which interface declaration is correct? A. public interface B extends A {} B. public interface B implements A {} C. public interface B instanceOf A {} D. public interface B inheritsFrom A {} Answer: A
19. Given: 1. class TestA { 2. public void start() { System.out.println("TestA"); } 3. } 4. public class TestB extends TestA { 5. public void start() { System.out.println("TestB"); } 6. public static void main(String[] args) { 7. ((TestA)new TestB()).start(); 8. } 9. } What is the result? A. TestA B. TestB C. Compilation fails. D. An exception is thrown at runtime. Answer: B
20. Given: 1. interface TestA { String toString(); } 2. public class Test { 3. public static void main(String[] args) { 4. System.out.println(new TestA() { 5. public String toString() { return "test"; } 6. }); 7. } 8. } What is the result? A. test B. null C. An exception is thrown at runtime. D. Compilation fails because of an error in line 1. E. Compilation fails because of an error in line 4. F. Compilation fails because of an error in line 5. Answer: A
EaSynth License: Apache License 2.0 Development: Active Size: 347Kb JRE: 5 or above Skinnable: Yes
EaSynth look and feel is a Synth based look and feel, the name \"EaSynth\" comes from \"Easy Synth\", because this look and feel is generated by EaSynth look and feel designer, this can be much easier than doing it manually. EaSynth look and feel and its source code (including the XML, Painter and GraphicsUtils classes java code and look and feel project file) will be released under the Apache License 2.0 very soon.Now you can get the stand-alone look and feel JAR file inside the EaSynth Look And Feel Designer package and integrate it into your application.
Oyoaha License: Free Apache Like License, Development: Active, Size: 382 Kb JRE: 4 or above Skinnable: Yes
Oyoaha look and feel is an open source project similar to EaSynth .It introduces new feature like transparency, sounds and is Skinable
1) Which package contains exception handling related classes?
java.lang
2) What are the two types of Exceptions?
Checked Exceptions and Unchecked Exceptions.
3) What is the base class of all exceptions?
java.lang.Throwable
4) What is the difference between Exception and Error in java?
Exception and Error are the subclasses of the Throwable class. Exception class is used for exceptional conditions that user program should catch. Error defines exceptions that are not excepted to be caught by the user program. Example is Stack Overflow.
5) What is the difference between throw and throws?
Throw is used to explicitly raise a exception within the program, the statement would be throw new Exception(); throws clause is used to indicate the exceptions that are not handled by the method. It must specify this behavior so the callers of the method can guard against the exceptions.
Throws is specified in the method signature. If multiple exceptions are not handled, then they are separated by a comma. the statement would be as follows: public void doSomething() throws IOException,MyException{}
6) Differentiate between Checked Exceptions and Unchecked Exceptions?
Checked Exceptions are those exceptions which should be explicitly handled by the calling method. Unhandled checked exceptions results in compilation error.
Unchecked Exceptions are those which occur at runtime and need not be explicitly handled. RuntimeException and it's subclasses, Error and it's subclasses fall under unchecked exceptions.
7) What are User defined Exceptions?
Apart from the exceptions already defined in Java package libraries, user can define his own exception classes by extending Exception class.
Cool What is the importance of finally block in exception handling?
Finally block will be executed whether or not an exception is thrown. If an exception is thrown, the finally block will execute even if no catch statement match the exception. Any time a method is about to return to the caller from inside try/catch block, via an uncaught exception or an explicit return statement, the finally block will be executed. Finally is used to free up resources like database connections, IO handles, etc.
9) Can a catch block exist without a try block?
No. A catch block should always go with a try block.
10) Can a finally block exist with a try block but without a catch?
Yes. The following are the combinations try/catch or try/catch/finally or try/finally.
11) What will happen to the Exception object after exception handling?
Exception object will be garbage collected.
12) The subclass exception should precede the base class exception when used within the catch clause. True/False?
True.
13) Exceptions can be caught or rethrown to a calling method. True/False?
True.
14) The statements following the throw keyword in a program are not executed. True/False?
True.
15) How does finally block differ from finalize() method?
Finally block will be executed whether or not an exception is thrown. So it is used to free resoources. finalize() is a protected method in the Object class which is called by the JVM just before an object is garbage collected.
16) What are the constraints imposed by overriding on exception handling?
An overriding method in a subclass may only throw exceptions declared in the parent class or children of the exceptions declared in the parent class.
continue must be in a loop( for, do , while ). It cannot appear in case constructs.
Primitive array types can never be assigned to each other, eventhough the primitives themselves can be assigned. ie., ArrayofLongPrimitives = ArrayofIntegerPrimitives gives compiler error eventhough longvar = intvar is perfectly valid.
Sun Certified Programmer for the Java 2 Platform, Standard
Question 1 Given: 11. public interface Status { 12. /* insert code here */ int MY_VALUE = 10; 13. } Which three are valid on line 12? (Choose three.)
A. final B. static C. native D. public E. private F. abstract G. protected
Answer: ABD
Question 2 Given: 10. public class Bar { 11.static void foo(int...x) { 12. // insert code here 13. } 14. } Which two code fragments, inserted independently at line 12, will allow the class to compile? (Choose two.) A. foreach(x) System.out.println(z); B. for(int z : x) System.out.println(z); C. while( x.hasNext()) System.out.println( x.next()); D. for( int i=0; i< x ="5;" b1 =" true;" b2 =" false;" x="=" b2 =" true)" x =" new" a =" x;" f=" (Delta)x;" f=" (Alpha)x;" b =" (Beta)(Alpha)x;" loc =" Locale.getLocale();" loc =" Locale.getDefault();" bc =" Locale.getLocale();" loc =" Locale.getDefault();" cardld =" cardlD;" ownername =" ownerName;" limit =" limit;"> } F. class Man { private BestFriend } Answer: D
Question 10 Given: 11. public class Person { 12. private name; 13. public Person(String name) { 14. this.name = name; 15. } 16. public int hashCode() { 17. return 420; 18. } 19. } Which is true? A. The time to find the value from HashMap with a Person key depends on the size of the map. B. Deleting a Person key from a HashMap will delete all map entries for all keys of type Person. C. Inserting a second Person object into a HashSet will cause the first Person object to be removed as a duplicate. D. The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map. Answer: A
Question 11 Given: 23. Object [] myObjects = { 24. new integer(12), 25. new String(”foo”), 26. new integer(5), 27. new Boolean(true) 28. }; 29. Arrays.sort(myObjects); 30. for( int i=0; isetAnchor(10,10); s->draw(); E. Circle c = new Circle(); c.Shape.setAnchor(10,10); c.Shape.draw(); Answer: C
Question 22 Given: 10. abstract public class Employee { 11. protected abstract double getSalesAmount(); 12. public double getCommision() { 13. return getSalesAmount() * 0.15; 14. } 15. } 16. class Sales extends Employee { 17. // insert method here 18. } Which two methods, inserted independently at line 17, correctly complete the Sales class? (Choose two.) A. double getSalesAmount() { return 1230.45; } B. public double getSalesAmount() { return 1230.45; } C. private double getSalesAmount() { return 1230.45; } D. protected double getSalesAmount() { return 1230.45; } Answer: BD
Question 23 Given: 10. interface Data { public void load(); } 11. abstract class Info { public abstract void load(); } Which class correctly uses the Data interface and Info class? A. public class Employee extends Info implements Data { public void load() { /*do something*/ } } B. public class Employee implements Info extends Data { public void load() { /*do something*/ } } C. public class Employee extends Info implements Data { public void load() { /*do something */ } public void Info.load() { /*do something*/ } } D. public class Employee implements Info extends Data { public void Data.load() { /*d something */ } public void load() { /*do something */ } } E. public class Employee implements Info extends Data { public void load() { /*do something */ } public void Info.load(){ /*do something*/ } } F. public class Employee extends Info implements Data{ public void Data.load() { /*do something*/ } public void Info.load() { /*do something*/ } } Answer: A
Question 24 Given: 11. public abstract class Shape { 12. private int x; 13. private int y; 14. public abstract void draw(); 15. public void setAnchor(int x, int y) { 16. this.x = x; 17. this.y = y; 18. } 19. } Which two classes use the Shape class correctly? (Choose two.) A. public class Circle implements Shape { private int radius; } B. public abstract class Circle extends Shape { private int radius; } C. public class Circle extends Shape { private int radius; public void draw(); } D. public abstract class Circle implements Shape { private int radius; public void draw(); } E. public class Circle extends Shape { private int radius; public void draw() {/* code here */} } F. public abstract class Circle implements Shape { private int radius; public void draw() { / code here */ } } Answer: BE
Question 25 Which two classes correctly implement both the java.lang.Runnable and the java.lang.Clonable interfaces? (Choose two.) A. public class Session implements Runnable, Clonable { public void run(); public Object clone(); } B. public class Session extends Runnable, Clonable { public void run() { / do something */ } public Object clone() { / make a copy */ } } C. public class Session implements Runnable, Clonable { public void run() { / do something */ } public Object clone() { /* make a copy */ } } D. public abstract class Session implements Runnable, Clonable { public void run() { / do something */ } public Object clone() { /*make a copy */ } } E. public class Session implements Runnable, implements Clonable { public void run() { / do something */ } public Object clone() { / make a copy */ } } Answer: CD
Question26 Click the Exhibit button. 1. public class GoTest { 2. public static void main(String[] args) { 3. Sente a = new Sente(); a.go(); 4. Goban b = new Goban(); b.go(); 5. Stone c = new Stone(); c.go(); 6. } 7. } 8. 9. class Sente implements Go { 10. public void go() { System.out.println(”go in Sente.”); } 11. } 12. 13. class Goban extends Sente { 14. public void go() { System.out.println(”go in Goban”); } 15. } 16. 17. class Stone extends Goban implements Go { } 18. 19. interface Go { public void go(); } What is the result? A. go in Goban go in Sente go in Sente B. go in Sente go in Sente go in Goban C. go in Sente go in Goban go in Goban D. go in Goban go in Goban go in Sente E. Compilation fails because of an error in line 17. Answer: C
Question 27 Given: 11. public static void parse(String str) { 12. try { 13. float f= Float.parseFloat(str); 14. } catch (NumberFormatException nfe) { 15. f= 0; 16. } finally { 17. System.out.println(f); 18. } 19. } 20. public static void main(String[] args) { 21. parse(”invalid”); 22. } What is the result? A. 0.0 B. Compilation fails. C. A ParseException is thrown by the parse method at runtime. D. A NumberFormatException is thrown by the parse method at runtime. Answer: B
Question 28 Click the Exhibit button. 1. public class Test { 2. int x= 12; 3. public void method(int x) { 4. x+=x; 5. System.out.println(x); 6. } 7. } Given: 34. Test t = new Test(); 35. t.method(5); What is the output from line 5 of the Test class? A. 5 B. 10 C. 12 D. 17 E. 24 Answer: B
Question 28 Given: 55. int []x= {1, 2,3,4, 5}; 56.int y[] =x; 57. System.out.println(y[2]); Which is true? A. Line 57 will print the value 2. B. Line 57 will print the value 3. C. Compilation will fail because of an error in line 55. D. Compilation will fail because of an error in line 56. Answer: B
Question 30 Given: 35. String #name = “Jane Doe”; 36.int$age=24; 37. Double_height = 123.5; 38. double~temp = 37.5; Which two are true? (Choose two.) A. Line 35 will not compile. B. Line 36 will not compile. C. Line 37 will not compile. D. Line 38 will not compile. Answer: AD
Question 31 Which two code fragments correctly create and initialize a static array of int elements? (Choose two.) A. static final int[] a = { 100,200 }; B. static final int[] a; static { a=new int[2]; a[0]=100; a[1]=200; } C. static final int[] a = new int[2] { 100,200 }; D. static final int[] a; static void init() { a = new int[3]; a[0]=100; a[1]=200; } Answer: AB
Question 32 Given: 11. public class Ball { 12. public enum Color { RED, GREEN, BLUE }; 13. public void foo() { 14. // insert code here 15. { System.out.println(c); } 16. } 17. } Which code inserted at line 14 causes the foo method to print RED, GREEN, and BLUE? A. for( Color c : Color.values()) B. for( Color c = RED; c <= BLUE; c++) C. for( Color c; c.hasNext() ; c.next()) D. for( Color c = Color[0]; c <= Color[2]; c++) E. for( Color c = Color.RED; c <= Color.BLUE; c++) Answer: A Question 33 Given: 10. public class Fabric 11. public enum Color { 12. RED(0xff0000), GREEN(0x00ff00), BLUE(0x0000ff); 13. private final int rgb; 14. Color( int rgb) { this.rgb = rgb; } 15. public int getRGB() { return rgb; } 16. }; 17. public static void main( String[] argv) { 18. // insert code here 19. } 20. } Which two code fragments, inserted independently at line 18, allow the Fabric class to compile? (Choose two.) A. Color skyColor = BLUE; B. Color treeColor = Color.GREEN; C. Color purple = new Color( 0xff00ff); D. if( RED.getRGB() < purple =" Color.BLUE" title =" t;" obj ="new" somearray =" (int[])obj;" counter =" 0;" a1 ="new" a2 ="new" a3 ="new" a="new" p =" new" p =" new" 1 =" new" p =" new" p =" Line.getPoint();" p =" Line.getPoint();" p =" (new" p =" (new" name =" “No" name =" nm;" empld =" “0000”;" empid =" id;" e =" new" name =" name;" bootch =" bootch;" snootch =" snootch;" b =" new" mydog =" Dogs.shepherd;" mydog =" Dogs.collie;" i =" uew" str =" “null’;" str ="=" pi =" new">3) { 13. System.out.print(”pi is bigger than 3. “); 14. } 15. else { 16. System.out.print(”pi is not bigger than 3. “); 17. } 18. finally { 19. System.out.println(”Have a nice day.”); 20. } ‘What is the result? A. Compilation fails. B. pi is bigger than 3. C. An exception occurs at runtime. D. pi is bigger than 3. Have a nice day. E. pi is not bigger than 3. Have a nice day. Answer: A
Question 58 Given: 10.int x=0; 11.int y 10; 12. do { l3. y--; 14. ++x; 15. } while (x < intx="12;" x=" 10;" list =" new" sorted =" new" i="0;i<=">6) break; 14. } 15. System.out.println(i); 16. } What is the result? A. 6 B. 7 C. 10 D. 11 E. Compilation fails. F. An exception is thrown at runtime. Answer: E
Question 64 Given: 8. public class test { 9. public static void main(String [] a) { 10. assert a.length == 1; 11. } 12. } Which two will produce an AssertionError? (Choose two.) A. java test B. java -ea test C. java test file1 D. java -ea test file1 E. java -ea test file1 file2 F. java -ea:test test file1 Answer: BE
Question 65 Given: 12. public class AssertStuff { 13. 14. public static void main(String [] args) { 15. int x= 5; 16. int y= 7; 17. 18. assert (x> y): “stuff”; 19. System.out.println(”passed”); 20. } 21. } And these command line invocations: java AssertStuff java -ea AssertStuff What is the result? A. passed stuff B. stuff passed C. passed An AssertionError is thrown with the word “stuff” added to the stack trace. D. passed An AssertionError is thrown without the word “stuff” added to the stack trace. E. passed An AssertionException is thrown with the word “stuff” added to the stack trace. F. passed An AssertionException is thrown without the word “stuff” added to the stack trace. Answer: C
Question 66 Click the Exhibit button. 1. public class Test { 2. 3. public static void main(String [] args) { 4. boolean assert = true; 5. if(assert) { 6. System.out.println(”assert is true”); 7. } 8. } 9. 10. } Given: javac -source 1.3 Test.java What is the result? A. Compilation fails. B. Compilation succeeds with errors. C. Compilation succeeds with warnings. D. Compilation succeeds without warnings or errors. Answer: C
Question 67 Given: 23.int z=5; 24. 25. public void stuff1(int x) { 26. assert (x> 0); 27. switch(x) { 28. case 2: x= 3; 29. default: assert false; } } 30. 31. private void stuff2(int y) { assert (y < z =" 6;" name ="=" a="new" a="new" con =" resourceFactory.getConnection();" r =" con.query(”GET" info =" r.getData();" b="new" c="new" a="new" b="new" a="new" args="null;" x="null;" value ="=" value ="=" value ="=" classb =" new" value =" “ClassB”;" a =" new" a =" new" x="i+y;" str =" “420”;" i =" args[0];" j =" 12;" j="=" j="=" j="=" j="=" buffer =" new">’); 26. return buffer.toString(); 27. } Which is true? A. This code is NOT thread-safe. B. The programmer can replace StringBuffer with StringBuilder with no other changes. C. This code will perform well and converting the code to use StringBuilder will not enhance the performance. D. This code will perform poorly. For better performance, the code should be rewritten: return “<“+ this.name + “>”; Answer: B
Question 90 Given: 1. public class MyLogger { 2. private StringBuilder logger = new StringBuuilder(); 3. public void log(String message, String user) { 4. logger.append(message); 5. logger.append(user); 6. } 7. } The programmer must guarantee that a single MyLogger object works properly for a multi-threaded system. How must this code be changed to be thread-safe? A. synchronize the log method B. replace StringBuilder with StringBuffer C. No change is necessary, the current MyLogger code is already thread-safe. D. replace StringBuilder with just a String object and use the string concatenation (+=) within the log method Answer: A
Question 91 Given: 11. public String makinStrings() { 12. String s = “Fred”; 13. s = s + “47”; 14. s = s.substring(2, 5); 15. s = s.toUpperCase(); 16. return s.toString(); 17. } How many String objects will be created when this method is invoked? A. 1 B. 2 C. 3 D. 4 E. 5 F. 6 Answer: C
Question 92 Given: 1. public class TestString3 { 2. public static void main(String[] args) { 3. // insert code here 5. System.out.println(s); 6. } 7. } Which two code fragments, inserted independently at line 3, generate the output 4247? (Choose two.) A. String s = “123456789”; s = (s-”123”).replace(1,3,”24”) - “89”; B. StringBuffer s = new StringBuffer(”123456789”); s.delete(0,3).replace( 1,3, “24”).delete(4,6); C. StringBuffer s = new StringBuffer(”123456789”); s.substring(3,6).delete( 1 ,3).insert( 1, “24”); D. StringBuilder s = new StringBuilder(”123456789”); s.substring(3,6).delete( 1 ,2).insert( 1, “24”); E. StringBuilder s = new StringBuilder(”123456789”); s.delete(0,3).delete( 1 ,3).delete(2,5).insert( 1, “24”); Answer: BE
Question 93 Given: 11. public class Yikes { 12. 13. public static void go(Long n) {System.out.println(”Long “);} 14. public static void go(Short n) {System.out.println(”Short “);} 15. public static void go(int n) {System.out.println(”int “);} 16. public static void main(String [] args) { 17. short y= 6; 18. long z= 7; 19. go(y); 20. go(z); 21. } 22. } What is the result? A. int Long B. Short Long C. Compilation fails. D. An exception is thrown at runtime. Answer: A
Question 94 Given: 12. public class Wow { 13. public static void go(short n) {System.out.println(”short”); } 14. public static void go(Short n) {System.out.println(”SHORT”);} 15. public static void go(Long n) {System.out.println(” LONG”); } 16. public static void main(String [] args) { 17. Short y= 6; 18.int z=7; 19. go(y); 20. go(z); 21. } 22. } What is the result? A. short LONG B. SHORT LONG C. Compilation fails. D. An exception is thrown at runtime. Answer: C
Question 95 Given: 10. class MakeFile { 11. public static void main(String[] args) { 12. try { 13. File directory = new File(”d”); 14. File file = new File(directory,”f”); 15. if(!file.exists()) { 16. file.createNewFile(); 17. } 18. } catch (IOException e) { 19. e.printStackTrace 20. } 21. } 22. } The current directory does NOT contain a directory named “d.” Which three are true? (Choose three.) A. Line 16 is never executed. B. An exception is thrown at runtime. C. Line 13 creates a File object named “d.” D. Line 14 creates a File object named “f.’ E. Line 13 creates a directory named “d” in the file system. F. Line 16 creates a directory named “d” and a file ‘f’ within it in the file system. G. Line 14 creates a file named ‘f’ inside of the directory named “d” in the file system. Answer: BCD
Question 96 When comparing java.io.BufferedWriter to java.io.FileWriter, which capability exists as a method in only one of the two? A. closing the stream B. flushing the stream C. writing to the stream D. marking a location in the stream E. writing a line separator to the stream Answer: E
Question 97 Given: 12. import java.io.*; 13. public class Forest implements Serializable { 14. private Tree tree = new Tree(); 15. public static void main(String [] args) { 16. Forest f= new Forest(); 17. try { 18. FileOutputStream fs = new FileOutputStream(”Forest.ser”); 19. ObjectOutputStream os = new ObjectOutputStream(fs); 20. os.writeObject(f); os.close(); 21. } catch (Exception ex) { ex.printStackTrace(); } 22. } } 23. 24. class Tree { } What is the result? A. Compilation fails. B. An exception is thrown at runtime. C. An instance of Forest is serialized. D. A instance of Forest and an instance of Tree are both serialized. Answer: B
Question 98 Click the Exhibit button. 1. import java.io.*; 2. public class Foo implements Serializable { 3. public int x, y; 4. public Foo( int x, int y) { this.x = x; this.y = y; } 5. 6. private void writeObject( ObjectOutputStream s) 7. throws IOException { 8. s.writeInt(x); s.writeInt(y) 9. } 10. 11. private void readObject( ObjectInputStream s) 12. throws IOException, ClassNotFoundException { 13. 14. // insert code here 15. 16. } 17. } Which code, inserted at line 14, will allow this class to correctly serialize and deserialize? A. s.defaultReadObject(); B. this = s.defaultReadObject(); C. y = s.readInt(); x = s.readInt(); D. x = s.readInt(); y = s.readInt(); Answer: D
Question 99 Which three concerning the use of the java.io.Serializable interface are true? (Choose three.) A. Objects from classes that use aggregation cannot be serialized. B. Art object serialized on one JVM can be successfully deserialized on a different JVM. C. The values in fields with the volatile modifier will NOT survive serialization and deserialization. D. The values in fields with the transient modifier will NOT survive serialization and deserialization. E. It is legal to serialize an object of a type that has a supertype that does NOT implement java.io.Serializable. Answer: BDE
Question 100 Assuming that the serializeBanana() and the deserializeBanana() methods will correctly use Java serialization and given: 13. import java.io.*; 14. class Food implemertts Serializable {int good = 3;} 15. class Fruit externds Food {int juice = 5;} 16. public class Banana extends Fruit { 17. int yellow = 4; 18. public static void main(String [] args) { 19. Banana b = new Banana(); Banana b2 = new Banana(); 20. b.serializeBanana(b); // assume correct serialization 21. b2 = b.deserializeBanana(); // assume correct 22. System.out.println(”restore “+b2.yellow+ b2.juice+b2.good); 24. } 25. // more Banana methods go here 50. } ‘What is the result? A. restore 400 B. restore 403 C. restore 453 D. Compilation fails. E. An exception is thrown at runtime. Answer: C
Question 101 Assuming that the serializeBanana2() and the deserializeBanana2() methods will correctly use Java serialization and given: 13. import java.io.*; 14. class Food {Food() { System.out.print(”1”); } } 15. class Fruit extends Food implements Serializable { 16. Fruit() { System.out.print(”2”); } } 17. public class Banana2 extends Fruit { int size = 42; 18. public static void main(String [] args) { 19. Banana2 b = new Banana2(); 20. b.serializeBanana2(b); // assume correct serialization 21. b = b.deserializeBanana2(b); // assume correct 22. System.out.println(” restored “+ b.size + “ “); } 23. // more Banana2 methods 24. } What is the result? A. Compilation fails. B. 1 restored 42 C. 12 restored 42 D. 121 restored 42 E. 1212 restored 42 F. An exception is thrown at runtime. Answer: D
Question 102 Given: 10. public class Foo implements java.io.Serializable { 11. private int x; 12. public int getX() { return x; } 12.publicFoo(int x){this.x=x; } 13. private void writeObject( ObjectOutputStream s) 14. throws IOException { 15. // insert code here 16. } 17. } Which code fragment, inserted at line 15, will allow Foo objects to be correctly serialized and deserialized? A. s.writeInt(x); B. s.serialize(x); C. s.writeObject(x); D. s.defaultWriteObject(); Answer: D
Question 103 Given: 12. NumberFormat nf= NumberFormat.getInstance(); 13. nf.setMaximumFractionDigits(4); 14. nf.setMinimumFractionDigits(2); 15. String a = nf.format(3.1415926); 16. String b = nf.format(2); Which two are true about the result if the default locale is Locale.US? (Choose two.) A. The value of b is 2. B. The value of a is 3.14. C. The value of b is 2.00. D. The value of a is 3.141. E. The value of a is 3.1415. F. The value of a is 3.1416. G. The value of b is 2.0000. Answer: CF
Question 104 Given: 11. double input = 314159.26; 12. NumberFormat nf= NumberFormat.getInstance(Locale.ITALIAN); 13. String b; 14. //insert code here Which code, inserted at line 14, sets the value of b to 3 14.159,26? A. b = nf.parse( input); B. b = nf.format( input); C. b = nf.equals( input); D. b = nf.parseObject( input); Answer: B
Question 105 Given: 14. DateFormat df; 15. Date date = new Date(); 16. //insert code here 17. String s = df.format( date); Which two, inserted independently at line 16, allow the code to compile? (Choose two.) A. df= new DateFormat(); B. df= Date.getFormatter(); C. df= date.getFormatter(); D. df= date.getDateFormatter(); E. df= Date.getDateFormatter(); F. df= DateFormat.getInstance(); G. df = DateFormat.getDateInstance(); Answer: FG
Question 106 Given: 12. Date date = new Date(); 13. df.setLocale(Locale.ITALY); 14. String s = df.format(date); The variable df is an object of type DateFormat that has been initialized in line 11. What is the result if this code is run on December 14, 2000? A. The value of s is 14-dic-2004. B. The value of s is Dec 14, 2000. C. An exception is thrown at runtime. D. Compilation fails because of an error in line 13. Answer: D
Question 107 Given: 33. Date d = new Date(0); 34. String ds = “December 15, 2004”; 35. // insert code here 36. try { 37. d = df.parse(ds); 38. } 39. catch(ParseException e) { 40. System.out.println(”Unable to parse “+ ds); 41. } 42. // insert code here too Which will create the appropriate DateFormat object and add a day to the Date object? A. 35. DateFormat df= DateFormat.getDateFormat(); 42. d.setTime( (60 * 60 * 24) + d.getTime()); B. 35. DateFormat df= DateFormat.getDateJnstance(); 42. d.setTime( (1000 * 60 * 60 * 24) + d.getTime()); C. 35. DateFormat df= DateFormat.getDateFormat(); 42. d.setLocalTime( (1000*60*60*24) + d.getLocalTime()); D. 35. DateFormat df= DateFormat.getDateJnstance(); 42. d.setLocalTime( (60 * 60 * 24) + d.getLocalTime()); Answer: B
Question 108 Given a valid DateFormat object named df, and 16. Date d = new Date(0L); 17. String ds = “December 15, 2004”; 18. // insert code here What updates d’s value with the date represented by ds? A. 18. d = df.parse(ds); B. 18. d = df.getDate(ds); C. 18. try { 19. d = df.parse(ds); 20. } catch(ParseException e) { }; D. 18. try { 19. d = df.getDate(ds); 20. } catch(ParseException e) { }; Answer: C
Question 109 Given: 11. String test = “This is a test”; 12. String[] tokens = test.split(”\s”); 13. System.out.println(tokens.length); What is the result? A. 0 B. 1 C. 4 D. Compilation fails. E. An exception is thrown at runtime. Answer: D
Question 110 Given: 11. String test= “a1b2c3”; 12. String[] tokens = test.split(”\\d”); 13. for(String s: tokens) System.out.print(s +“ “); What is the result? A. a b c B. 1 2 3 C. a1b2c3 D. a1 b2 c3 E. Compilation fails. F. The code runs with no output. G. An exception is thrown at runtime. Answer: A
Question 111 Given: 11. String test = “Test A. Test B. Test C.”; 12. // insert code here 13. String[] result = test.split(regex); Which regular expression inserted at line 12 will correctly split test into “Test A,” “Test B,” and “Test C”? A. String regex = “”; B. String regex = “ “; C. String regex = “.*“. D. String regex = “\\s” E. String regex = “\\.\\s*”; F. String regex = “\\w[ \.] +“; Answer: E
Question 112 Given: 12. System.out.format(”Pi is approximately %d.”, Math.PI); What is the result? A. Compilation fails. B. Pi is approximately 3. C. Pi is approximately 3.141593. D. An exception is thrown at runtime. Answer: D
Question 113 Given: 12. String csv = “Sue,5,true,3”; 13. Scanner scanner = new Scanner( csv); 14. scanner.useDelimiter(”,”); 15. int age = scanner.nextInt(); What is the result? A. Compilation fails. B. After line 15, the value of age is 5. C. After line 15, the value of age is 3. D. An exception is thrown at runtime. Answer: D
Question 114 Which two code fragments will execute the method doStuff() in a separate thread? (Choose two.) A. new Thread() { public void run() { doStuff(); } } B. new Thread() { public void start() { doStuff(); } } C. new Thread() { public void start() { doStuff(); } } .run(); D. new Thread() { public void run() { doStuff(); } } .start(); E. new Thread(new Runnable() { public void run() { doStuff(); } } ).run(); F. new Thread(new Runnable() { public void run() { doStuff(); } }).start(); Answer: DF
Question 115 Given: 1. public class Threads3 implements Runnable { 2. public void run() { 3. System.out.print(”running”); 4. } 5. public static void main(String[] args) { 6. Thread t = new Thread(new Threads3()); 7. t.run(); 8. t.run(); 9. t.start(); 10. } 11. } What is the result? A. Compilation fails. B. An exception is thrown at runtime. C. The code executes and prints “running”. D. The code executes and prints “runningrunning”. E. The code executes and prints “runningrunningrunning”. Answer: E
Question 116 Given: 1. public class Threads4 { 2. public static void main (String[] args) { 3. new Threads4().go(); 4. } 5. public void go() { 6. Runnable r = new Runnable() { 7. public void run() { 8. System.out.print(”foo”); 9. } 10. }; 11. Thread t = new Thread(r); 12. t.start(); 13. t.start(); 14. } 15. } What is the result? A. Compilation fails. B. An exception is thrown at runtime. C. The code executes normally and prints ‘foo”. D. The code executes normally, but nothing is printed. Answer: B Question 117
Given: 1. public class Threads5 { 2. public static void main (String[] args) { 3. new Thread(new Runnable() { 4. public void run() { 5. System.out.print(”bar”); 6. }}).start(); 7. } 8. } What is the result? A. Compilation fails. B. An exception is thrown at runtime. C. The code executes normally and prints “bar”. D. The code executes normally, but nothing prints. Answer: C
Question 118 Given: 11. Runnable r = new Runnable() { 12. public void run() { 13. System.out.print(”Cat”); 14. } 15. }; 16. Threadt=new Thread(r) { 17. public void run() { 18. System.out.print(”Dog”); 19. } 20. }; 21. t.start(); What is the result? A. Cat B. Dog C. Compilation fails. D. The code runs with no output. E. An exception is thrown at runtime. Answer: B
Question 119 Click the Exhibit button. Given: 10. public class Starter extends Thread { 11. private int x= 2; 12. public static void main(String[] args) throws Exception { 13. new Starter().makeItSo(); 14. } 15. public Starter() { 16. x=5; 17. start(); 18. } 19. public void makeItSo() throws Exception { 20. join(); 21. x=x- 1; 22. System.out.println(x); 23. } 24. public void run() { x *= 2; } 25. } What is the output if the main() method is rum? A. 4 B. 5 C. 8 D. 9 E. Compilation fails. F. An exception is thrown at runtime. G. It is impossible to determine for certain. Answer: D
Question 120 Given: 1. public class Threads2 implements Runnable { 2. 3. public void nun() { 4. System.out.println(”run.”); 5. throw new RuntimeException(”Problem”); 6. } 7. public static void main(String[] args) { 8. Thread t = new Thread(new Threads2()); 9. t.start(); 10. System.out.println(”End of method.”); 11. } 12. } Which two can be results? (Choose two.) A. java.lang.RuntimeException: Problem B. run. java.lang.RuntimeException: Problem C. End of method. java.lang.RuntimeException: Problem D. End of method. run. java.lang.RuntimeException: Problem E. run. java.lang.RuntimeException: Problem End of method. Answer: DE
Question 121 Given: 1. public class TestOne { 2. public static void main (String[] args) throws Exception { 3. Thread.sleep(3000); 4. System.out.println(”sleep”); 5. } 6. } What is the result? A. Compilation fails. B. An exception is thrown at runtime. C. The code executes normally and prints “sleep”. D. The code executes normally, but nothing is printed. Answer: C Question 122 Given: 1. public class TestOne implements Runnable { 2. public static void main (String[] args) throws Exception { 3. Thread t = new Thread(new TestOne()); 4. t.start(); 5. System.out.print(”Started”); 6. t.join(); 7. System.out.print(”Complete”); 8. } 9. public void run() { 10. for (int i= 0; i< resource =" new" t2 =" new" name =" name;" count =" 0;" intx="0;" current =" 0;" int="i=" current =" x;" x =" current" r1 =" new" names =" new" i =" 0;" class="" implementation="" name="“hello”;" x="current" p0="new" t="new" z="new" y="new" vehicle="new" car="new" racer="new" cat="(Cat)animal;" animal="new" p2="new" p1="new" p4="new" p3="new" it="new" i="0;i<2;i++)" obj="new" computations="new" r2="new" num="num;" r1="6," current="x;" o="new" sl="new" rl="“" iscomplete="true;">list = new java.util.ArrayList(); 21. list.add(new B()); 22. list.add(new C()); 23. for (A a:list) { 24. a.x(); 25. a.y();; 26. } What is the result? A. The code runs with no output. B. An exception is thrown at runtime. C. Compilation fails because of an error in line 20. D. Compilation fails because of an error in line 21. E. Compilation fails because of an error in line 23. F. Compilation fails because of an error in line 25. Answer: F
