Mphasis Placement Paper -: Java Questions With Answers

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1. What is the key difference between a while loop and a do-while loop in Java?

   A: The syntax used to define the loop

   B: The number of iterations performed

   C: The condition check timing

   D: The ability to use the break statement

   Ans: C

2. Which loop construct guarantees that the loop body is executed at least once?

   A: for loop

   B: while loop

   C: do-while loop

   D: continue statement

   Ans: C

3. What is an infinite loop?

   A: A loop that executes only once

   B: A loop that never terminates naturally

   C: A loop that contains an unreachable code block

   D: A loop that uses the continue statement

   Ans: B

4. Which statement is used to exit a loop prematurely?

   A: return statement

   B: continue statement

   C: break statement

   D: exit statement

   Ans: C

5. Which loop construct is best suited for iterating over an array or a collection?

   A: for loop

   B: while loop

   C: do-while loop

   D: continue statement

   Ans: A

6. How do you declare an array in Java?

   A: int arrayName;

   B: int[] arrayName;

   C: int arrayName[];

   D: Both b and c

   Ans: D

7. Which method is used to get the length of an array in Java?

   A: length()

   B: size()

   C: getLength()

   D: length

   Ans: D

8. How do you initialize an array in Java?

   A: int[] arr = (1,2,3,4,5);

   B: int arr = {1,2,3,4,5};

   C: int[] arr = new int[]{1,2,3,4,5};

   D: int arr = new int(5);

   Ans: C

9. What happens when you try to access an array element with an index that is out of bounds?

   A: It returns -1

   B: It returns a null value

   C: It throws an exception

   D: It initializes a new array

   Ans: C

10. How can you check if two arrays are equal in Java?

    A: Use the == operator

    B: Use the .equals() method

    C: Use Arrays.equals() method

    D: Compare each element one by one

    Ans: C

11. How do you access the fourth element of an array named numbers?

    A: numbers[4];

    B: numbers(3);

    C: numbers[3];

    D: numbers.get(3);

    Ans: C

12. Which of the following operators is used for concatenation of two strings?

    A: +

    B: *

    C: &

    D: +=

    Ans: A

13. Which of the following creates a mutable string?

    A: String

    B: StringBuilder

    C: StringChar

    D: StringMutable

    Ans: B

14. In Java, strings are:

    A: Primitive data types

    B: Immutable objects

    C: Mutable objects

    D: Arrays of characters

    Ans: B

15. How do you find the length of a string named 'example'?

    A: example.size()

    B: example.length()

    C: example.getLength()

    D: example.len()

    Ans: B

16. What is the result of the expression "Java" + "Programming"?

    A: JavaProgramming

    B: Java Programming

    C: Java-Programming

    D: JavaProgramming-

    Ans: A

17. Which method is used to compare two strings for equality?

    A: ==

    B: equals()

    C: compare()

    D: isEqual()

    Ans: B

18. Which class can create a string that is thread-safe?

    A: String

    B: StringBuffer

    C: StringBuilder

    D: StringSafe

    Ans: B

19. What is the root class for all Java classes?

    A: Object

    B: Class

    C: Superclass

    D: Root

    Ans: A

20. What is polymorphism?

    A: Multiple forms

    B: Single form

    C: No form

    D: Static form

    Ans: A

21. What is encapsulation in Java?

    A: The process of combining data and methods into a single unit

    B: The process of hiding data and methods within a class

    C: The process of creating multiple instances of a class

    D: The process of reusing code from existing classes

    Ans: B

22. What is inheritance in Java?

    A: The process of creating multiple instances of a class

    B: The process of hiding data and methods within a class

    C: The process of reusing code from existing classes

    D: The process of combining data and methods into a single unit

    Ans: C

23. What is polymorphism in Java?

    A: The ability of a class to inherit properties and behaviors from another class

    B: The process of hiding data and methods within a class

    C: The process of creating multiple instances of a class

    D: The ability of an object to take on many forms

    Ans: D