1. Which of the following is a type of polymorphism in Java?

2. 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?

3. Identify the output of the following program.

String str = “Hellow”;
System.out.println(str.indexOf(‘t));

4. Which of these is correct way of calling a constructor having no parameters, of superclass A by subclass B?

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

6. 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);
       }
}

7. 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));

            }

        }

8. 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() + " ");

            }

        }

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

        class A 

        {

            int i;

            public void display() 

            {

                System.out.println(i);

            }    

        }    

        class B extends A 

       {

            int j;

            public void display() 

            {

                System.out.println(j);

            } 

        }    

        class Dynamic_dispatch 

       {

            public static void main(String args[])

            {

                B obj2 = new B();

                obj2.i = 1;

                obj2.j = 2;

                A r;

                r = obj2;

                r.display();     

            }

       }

10. How to convert Date object to String?

11. Which of these statements is incorrect about Thread?

12. Find the output of the following code.

        class output 

        {

            public static void main(String args[])

            { 

               StringBuffer s1 = new StringBuffer("Quiz");

               StringBuffer s2 = s1.reverse();

               System.out.println(s2);

            }

        }

13. What is true about final class?

14. Which two classes use the Shape class correctly?

A. public class Circle implements Shape 
   {
    private int radius;
   }
B. public abstract class Circle extends Shape 
   {
    private int radius;
   }
C. public class Circle extends Shape 
   {
   private int radius;
   public void draw();
   }
D. public abstract class Circle implements Shape 
   {
    private int radius;
    public void draw();
   }
E. public class Circle extends Shape 
   {
    private int radius;
    public void draw()
    {
     /* code here */
    }
   }
F. public abstract class Circle implements Shape 
   {
     private int radius;
     public void draw() 
     { 
      /* code here */ 
     }
   }

15. Find the output of the following program.

public class MyFirst {  
 public static void main(String[] args) {  
 MyFirst obj = new MyFirst(n);  
     }  
     static int a = 10;  
     static int n;  
     int b = 5;  
     int c;  
     public MyFirst(int m) {  
           System.out.println(a + ", " + b + ", " + c + ", " + n + ", " + m);  
       }  
    // Instance Block  
      {  
         b = 30;  
         n = 20;  
      }   
    // Static Block  
      static   
    {  
              a = 60;  
         }   
     }