Java Multiple Choice Question MCQ

Categories: Java

1. Which exception is thrown when java is out of memory?

a) MemoryError

b) OutOfMemoryError

c) MemoryOutOfBoundsException

d) MemoryFullException

Answer: b

2. What will be the output of the following Java code?

    class String_demo 

    {

        public static void main(String args[])

        {

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

            String s = new String(chars);

            System.out.println(s);

        }

   }

a) abc

b) a

c) b

d) c

Answer: a

3. Which of these are selection statements in Java?

a) break

b) continue

c) for()

d) if()

Answer: d

4. What will be the output of the following Java program?

    class recursion 

    {

        int func (int n) 

        {

            int result;

            if (n == 1)

                return 1;

            result = func (n - 1);

            return result;

        }

    } 

    class Output 

    {

        public static void main(String args[]) 

        {

            recursion obj = new recursion() ;

            System.out.print(obj.func(5));

        }

    }

a) 1

b) 120

c) 0

d) None of the mentioned

Answer: a

5. What will be the output of the following Java code?

    class output 

    {

        public static void main(String args[])

        { 

           String c = "Hello i love java";

           boolean var;

           var = c.startsWith("hello");

           System.out.println(var);

        }

    }

a) 0

b) true

c) 1

d) false

Answer: d

6. Which of these keywords is used to define interfaces in Java?

a) intf

b) Intf

c) interface

d) Interface

Answer: c

7. What will be the output of the following Java program?

    class output 

    {

        public static void main(String args[])

        { 

           StringBuffer s1 = new StringBuffer("Quiz");

           StringBuffer s2 = s1.reverse();

           System.out.println(s2);

        }

    }

a) QuizziuQ

b) ziuQQuiz

c) Quiz

d) ziuQ

Answer: d

8. What will be the output of the following Java code?

    class Output 

    {

        public static void main(String args[]) 

        {

            Integer i = new Integer(257);  

            byte x = i.byteValue();

            System.out.print(x);

        }

    }

a) 257

b) 256

c) 1

d) 0

Answer: c

9. What will be the output of the following Java program?

    class Output 

    {

         public static void main(String args[]) 

        {

            double x = 2.0;  

            double y = 3.0;

            double z = Math.pow( x, y );

            System.out.print(z);

        }

    }

a) 9.0

b) 8.0

c) 4.0

d) 2.0

Answer: b

10. Which of the following is a superclass of every class in Java?

a) ArrayList

b) Abstract class

c) Object class

d) String

Answer: c