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2016 Nov 1z0-851 study guide pdf:

Q141. Given:

1. public class Boxer1{

2. Integer i;

3. int x;

4. public Boxer1(int y) {

5. x = i+y;

6. System.out.println(x);

7. }

8. public static void main(String[] args) {

9. new Boxer1(new Integer(4));

10. }

11. }

What is the result?

A. The value "4" is printed at the command line.

B. Compilation fails because of an error in line 5.

C. Compilation fails because of an error in line 9.

D. A NullPointerException occurs at runtime.

E. A NumberFormatException occurs at runtime.

F. An IllegalStateException occurs at runtime.

Answer: D


Q142. Which statement is true?

A. A class's finalize() method CANNOT be invoked explicitly.

B. super.finalize() is called implicitly by any overriding finalize() method.

C. The finalize() method for a given object is called no more than once by the garbage collector.

D. The order in which finalize() is called on two objects is based on the order in which the two objects

became finalizable.

Answer: C


Q143. Given:

10. interface Jumper { public void jump(); } ...

20. class Animal {} ...

30. class Dog extends Animal {

31. Tail tail; 32. } ...

40. class Beagle extends Dog implements Jumper{

41. public void jump() {}

42. } ...

50. class Cat implements Jumper{

51. public void jump() {}

52. }

Which three are true? (Choose three.)

A. Cat is-a Animal

B. Cat is-a Jumper

C. Dog is-a Animal

D. Dog is-a Jumper

E. Cat has-a Animal

F. Beagle has-a Tail

G. Beagle has-a Jumper

Answer: BCF


Q144. DRAG DROP

Click the Task button.

Answer:


Q145. Given classes defined in two different files:

1. package util;

2. public class BitUtils {

3. private static void process(byte[] b) {}

4. }

1. package app;

2. public class SomeApp {

3. public static void main(String[] args) {

4. byte[] bytes = new byte[256];

5. // insert code here

6. }

7. }

What is required at line 5 in class SomeApp to use the process method of BitUtils?

A. process(bytes);

B. BitUtils.process(bytes);

C. app.BitUtils.process(bytes);

D. util.BitUtils.process(bytes);

E. import util.BitUtils.*; process(bytes);

F. SomeApp cannot use the process method in BitUtils.

Answer: F


Renewal 1z0-851 enu:

Q146. 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


Q147. Given:

5. class Thingy { Meter m = new Meter(); }

6. class Component { void go() { System.out.print("c"); } }

7. class Meter extends Component { void go() { System.out.print("m"); } }

8.

9. class DeluxeThingy extends Thingy {

10. public static void main(String[] args) {

11. DeluxeThingy dt = new DeluxeThingy();

12. dt.m.go();

13. Thingy t = new DeluxeThingy();

14. t.m.go();

15. }

16. }

Which two are true? (Choose two.)

A. The output is mm.

B. The output is mc.

C. Component is-a Meter.

D. Component has-a Meter.

E. DeluxeThingy is-a Component.

F. DeluxeThingy has-a Component.

Answer: AF


Q148. A programmer must create a generic class MinMax and the type parameter of MinMax must implement

Comparable. Which implementation of MinMax will compile?

A. class MinMax<E extends Comparable<E>> {

E min = null;

E max = null;

public MinMax() {}

public void put(E value) { /* store min or max */ }

B. class MinMax<E implements Comparable<E>> {

E min = null;

E max = null;

public MinMax() {}

public void put(E value) { /* store min or max */ }

C. class MinMax<E extends Comparable<E>> {

<E> E min = null;

<E> E max = null;

public MinMax() {}

public <E> void put(E value) { /* store min or max */ }

D. class MinMax<E implements Comparable<E>> {

<E> E min = null;

<E> E max = null;

public MinMax() {}

public <E> void put(E value) { /* store min or max */ }

Answer: A


Q149. 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; i<myObjects.length; i++) {

31. System.out.print(myObjects[i].toString());

32. System.out.print(" ");

33. }

What is the result?

A. Compilation fails due to an error in line 23.

B. Compilation fails due to an error in line 29.

C. A ClassCastException occurs in line 29.

D. A ClassCastException occurs in line 31.

E. The value of all four objects prints in natural order.

Answer: C


Q150. Click the Exhibit button. Given: ClassA a = new ClassA(); a.methodA(); What is the result?

A. Compilation fails.

B. ClassC is displayed.

C. The code runs with no output.

D. An exception is thrown at runtime.

Answer: D