Java Quiz

1. What is the process of defining a method in terms of itself, that is a method that calls itself?

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

        class A 

        {

            public int i;

            protected int j;

        }    

        class B extends A 

        {

            int j;

            void display() 

            {

                super.j = 3;

                System.out.println(i + " " + j);

            }

        }    

        class Output 

        {

            public static void main(String args[])

            {

                B obj = new B();

                obj.i=1;

                obj.j=2;   

                obj.display();     

            }

       }

3. What is garbage collection in the context of Java?

4. What is the syntax for java main method?

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

    class San

    {

     public void m1 (int i,float f)

     {

      System.out.println(" int float method");

     }

     

     public void m1(float f,int i);

      {

      System.out.println("float int method");

      }

     

      public static void main(String[]args)

      {

        San s=new San();

            s.m1(20,20);

      }

    }

6. A method within a class is only accessible by classes that are defined within the same package as the class of the method. Which one of the following is used to enforce such restriction?

7. Find the output of the following program.

public class Solution{
       public static void main(String[] args){
                     byte x = 127;
                     x++;
                     x++;
                     System.out.print(x);
       }
}

8. Which of these statements is incorrect about Thread?

9. What is not the use of “this” keyword in Java?

10. Which environment variable is used to set the java path?

11. Identify the modifier which cannot be used for constructor.

12. Find the output of the following code.

        class leftshift_operator 

        {

            public static void main(String args[]) 

            {        

                 byte x = 64;

                 int i;

                 byte y; 

                 i = x << 2;

                 y = (byte) (x << 2);

                 System.out.print(i + " " + y);

            } 

        }

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

14. Which of these keywords cannot be used for a class which has been declared final?

15. Which of these data types is used to store command line arguments?