PRO 192 Final Exam Questions and All Correct Answers 2025/2026 Updated.

PRO 192 Final Exam Questions and All
Correct Answers 2025/2026 Updated.
What is the output of this program?

class Test {

public static void main(String[] args){

HashSet set = new HashSet();

set.add("ABC");

set.add("ABC");

set.add("CDF");

Iterator iterator = set.iterator();

while(iterator.hasNext())

{

System.out.println(iterator.next().toString()); break;

}

}

}

a. Compile error

b. ABCABC

CDF

c. ABCCDF

d. ABC - Answer d.



How many finally blocks can there be in a try/catch structure?

Select one:

a. There can be 0 or 1 following the last catch block.

b. There must be 1.

c. There is no limit to the number of finally blocks following the last catch block.

d. There can be 1 following each catch block. - Answer a.



What is the output of this program?

class Test {

public static void main(String[] args){

String str1 = "ABC");

String str2 = "ABC";

,System.out.println(str1==str2);

}

}

Select one:

a. true

b. false - Answer a.



Which one of the following is not true?

Select one:

a. Abstract methods should be implemented in the derived class.

b. A class containing abstract methods is called an abstract class.

c. An abstract class cannot have non-abstract methods.

d. A class must be qualified as 'abstract' class, if it contains one abstract method.

e. None of the above. - Answer c.



What modifier is to be used If you wish to declare that you want to no longer allow subclasses
to override your variables or methods?

Select one:

a. synchronized

b. final

c. volatile

d. finally

e. abstract - Answer b.



Consider the following class definition:

public class MyClass

{

private int value;

public void setValue(int i){ /* code */ }

// Other methods...

}

The method setValue assigns the value of i to the instance field value. What could you write for
the implementation of setValue?

Select one:

a. III. value == i;

,b. Both (I) and (II) and above

c. (I), (II) and (III) above.

d. II. this.value = i;

e. I. value = i; - Answer b.



Consider the following program written in Java.

class Selection{

public static void main(String args[]){

int x=7;

if(x==2); //? Note the semicolon

System.out.println("Number seven");

System.out.println("Not seven");

}

}

What would the output of the program be?

Select one:

a. Number sevenNot seven

b. 7

c. Number seven

d. Not seven

e. Error - Answer a.



InputStream class is an ________

Select one:

a. base class

b. interface

c. class

d. abstract class - Answer d.



A collection is a container that helps to group multiple elements of Object class into a single unit

Select one:

a. FALSE

b. TRUE - Answer a.



Which access specifiers should be implemented in a class for all interface methods?

, I. private.

II. public.

III. protected.

Select one:

a. Only (I) above

b. Only (III) above

c. All (I), (II) and (III) above.

d. Both (I) and (III) above

e. Only (II) above - Answer e.



char chars[] = { 'a', 'b', 'c', 'd', 'e', 'f'};

String s = new String(chars, 2, 3);

System.out.println (s);

What is the output of the above code?

Select one:

a. abc

b. bcd

c. acd.

d. deb

e. cde - Answer e.



What is the error in the following class definitions?

abstract class xy

{

abstract sum (int x, int y) { }

}

Select one:

a. Method is not defined properly

b. Class header is not defined properly.

c. Method is defined properly

d. No error.

e. Constructor is not defined. - Answer a.



Given Main class

class Main {