Java Quiz

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

        class String_demo 

        {

            public static void main(String args[])

            {

                int ascii[] = { 65, 66, 67, 68};

                String s = new String(ascii, 1, 3);

                System.out.println(s);

            }

       }

2. How to sort an array?

3. Which of these can be used to differentiate two or more methods having the same name?

4. What is the process of defining two or more methods within same class that have same name but different parameters declaration?

5. File class is included in which package?

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

        class recursion 

        {

            int func (int n) 

            {

                int result;

                result = func (n - 1);

                return result;

            }

        } 

        class Output 

        {

            public static void main(String args[]) 

            {

                recursion obj = new recursion() ;

                System.out.print(obj.func(12));

            }

        }

7. Which constructor creates an empty string buffer with the specified capacity as length.

8. Find the output of the following code.

        class bool_operator 

        {

            public static void main(String args[]) 

            {    

                 boolean a = true;

                 boolean b = !true;

                 boolean c = a | b;

     	     boolean d = a & b;

                 boolean e = d ? b : c;

                 System.out.println(d + " " + e);

            } 

        }

9. Find the output of the following code.

        import java.util.*;

        class Collection_iterators 

        {

            public static void main(String args[]) 

            {

                LinkedList list = new LinkedList();

                list.add(new Integer(2));

                list.add(new Integer(8));

                list.add(new Integer(5));

                list.add(new Integer(1));

                Iterator i = list.iterator();

                Collections.reverse(list);

    	    Collections.sort(list);

                while(i.hasNext())

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

            }

        }

10. Find the output of the following program.

public class Solution{
       public static void main(String[] args){
                     short x = 10;
                     x =  x * 5;
                     System.out.print(x);
       }
}

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

        class recursion 

        {

            int fact(int n) 

            {

                int result;

                if (n == 1)

                    return 1;

                result = fact(n - 1) * n;

                return result;

            }

        } 

        class Output 

        {

            public static void main(String args[]) 

            {

                recursion obj = new recursion() ;

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

            }

        }

12. From the following statements which is a disadvantage of an java array?

13. What is the default value of String variable?

14. Which of these is correct about passing an argument by call-by-value process?

15. What is true about final class?