1. Which of these statements are incorrect?

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

class Char {
public static void main(String args[]) {
char ch1, ch2;
ch1 = 88; // code for X
ch2 = 'Y';
System.out.print("ch1 and ch2: ");
System.out.println(ch1 + " " + ch2);
}
} 

3. 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 */ 
     }
   }

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

        class Output 

        {

            public static void main(String args[])

            {

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

                for ( int i = 0; i < arr.length - 2; ++i)

                    System.out.println(arr[i] + " ");

            } 

        }

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

7. Which of these statements is incorrect about Thread?

8. 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();     

            }

       }

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

        class static_out 

        {

            static int x;

     	static int y;

            void add(int a, int b)

            {

                x = a + b;

                y = x + b;

            }

        }    

        public class static_use 

        {

            public static void main(String args[])

            {

                static_out obj1 = new static_out();

                static_out obj2 = new static_out();   

                int a = 2;

                obj1.add(a, a + 1);

                obj2.add(5, a);

                System.out.println(obj1.x + " " + obj2.y);     

            }

       }

10. What is an ineterface?

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

12. 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() + " ");

            }

        }

13. Find the value of A[1] after execution of the following program.

int[] A = {0,2,4,1,3};
for(int i = 0; i < a.length; i++){
    a[i] = a[(a[i] + 3) % a.length];
}

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

        class output 

        {

            public static void main(String args[])

            {

                String a = "hello i love java";

                System.out.println(a.indexOf('i')+" "+a.indexOf('o') +" "+a.lastIndexOf('i')+" "+a.lastIndexOf('o'));

            }

        }

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

        class output 

        {

            public static void main(String args[])

            {

                 String chars[] = {"a", "b", "c", "a", "c"};

                 for (int i = 0; i < chars.length; ++i)

                     for (int j = i + 1; j < chars.length; ++j)

                         if(chars[i].compareTo(chars[j]) == 0)

                             System.out.print(chars[j]); 

            }

       }