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Q51. Given:

public class ComputeSum {

public int x;

public int y;

public int sum;

public ComputeSum (int nx, int ny) {

x = nx; y =ny;

public void setX(int nx) { x = nx; updateSum();}

public void setY(int ny) { x = ny; updateSum();}

void updateSum() { sum = x + y;}

This class needs to protect an invariant on the sum field.

Which three members must have the private access modifier to ensure that this invariant is maintained?

A. The x field

B. The y field

C. The sum field

D. The ComputerSum ( ) constructor

E. The setX ( ) method

F. The setY ( ) method

Explanation: The sum field and the two methods (setX and SetY) that updates the sum field.

Q52. Given:

class Cake {

int model;

String flavor;

Cake() {

model = 0;

flavor = "Unknown";

public class Test {

public static void main(String[] args) {

Cake c = new Cake();

bake1(c);

System.out.println(c.model + " " + c.flavor);

bake2(c);

System.out.println(c.model + " " + c.flavor);

public static Cake bake1(Cake c) {

c.flavor = "Strawberry";

c.model = 1200;

return c;

public static void bake2(Cake c) {

c.flavor = "Chocolate";

c.model = 1230;

return;

What is the result?

A. 0 unknown 0 unknown

B. 1200 Strawberry 1200 Strawberry

C. 1200 Strawberry 1230 Chocolate

D. Compilation fails

Explanation: 1200 Strawberry 1230 Chocolate

Q53. Given:

What is the result?

A. 10 : 22 : 20

B. 10 : 22 : 22

C. 10 : 22 : 6

D. 10 : 30 : 6

Q54. Which three statements describe the object-oriented features of the Java language?

A. Objects cannot be reused.

B. A subclass can inherit from a superclass.

C. Objects can share behaviors with other objects.

D. A package must contain more than one class.

E. Object is the root class of all other objects.

F. A main method must be declared in every class.

Q55. Which two statements correctly describe checked exception?

A. These are exceptional conditions that a well-written application should anticipate and recover from.

B. These are exceptional conditions that are external to the application, and that the application usually cannot anticipate or recover from.

C. These are exceptional conditions that are internal to the application, and that the application usually cannot anticipate or recover from.

D. Every class that is a subclass of RuntimeException and Error is categorized as checked exception.

E. Every class that is a subclass of Exception, excluding RuntimeException and its subclasses, is categorized as checked exception.

Explanation: Checked exceptions:

* (B) represent invalid conditions in areas outside the immediate control of the program (invalid user input, database problems, network outages, absent files)

* are subclasses of Exception It's somewhat confusing, but note as well that RuntimeException (unchecked) is itself a subclass of Exception (checked).

* a method is obliged to establish a policy for all checked exceptions thrown by its implementation (either pass the checked exception further up the stack, or handle it somehow)

Reference: Checked versus unchecked exceptions

Q56. Given:

Which two code fragments are valid?

A. Option A

B. Option B

C. Option C

D. Option D

E. Option E

Explanation: When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class (C). However, if it does not, then the subclass must also be declared abstract (B). Note: An abstract class is a class that is declared abstract—it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.

Q57. Given the following class declarations:

public abstract class Animal

public interface Hunter

public class Cat extends Animal implements Hunter

public class Tiger extends Cat

Which answer fails to compile?

A. Option A

B. Option B

C. Option C

D. Option D

E. Option E

Explanation: Look at the right side of the declaration ArrayLIst() rather than ArrayList

Q58. Given:

What is the result?

A. C B A

B. C

C. A B C

D. Compilation fails at line n1 and line n2

Q59. Given:

What is the result?

A. Option A

B. Option B

C. Option C

D. Option D

Q60. Given the code fragment:

What is the result?

A. A B C

B. A B C D E

C. A B D E

D. Compilation fails.