1. Identify the output of the following program.

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

2. In Iterator, hasMoreElements() method of Enumeration has been changed to:

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

class multidimention_array 
    {
        public static void main(String args[])
        {
            int arr[][] = new int[3][];
            arr[0] = new int[1];
            arr[1] = new int[2];
            arr[2] = new int[3];               
	    int sum = 0;
	    for (int i = 0; i < 3; ++i) 
	        for (int j = 0; j < i + 1; ++j)
                    arr[i][j] = j + 1;
	    for (int i = 0; i < 3; ++i) 
	        for (int j = 0; j < i + 1; ++j)
                    sum + = arr[i][j];
	    System.out.print(sum); 	
        } 
    }

4. File class is included in which package?

5. Which of the following is not an OOPS concept in Java?

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

        class Output 

        {

            public static void main(String args[])

            {

                 Object obj = new Object();

    	     System.out.print(obj.getclass());

            }

        }

7. 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);
}
} 

8.  Which variables are created when an object is created with the use of the keyword 'new' and destroyed when the object is destroyed?

9. Which of these statements are incorrect?

10. 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] + " ");

            } 

        }

11. 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;  
         }   
     }  

12. 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);
       }
}

13. Which statement provides an easy way to dispatch execution to different parts of your code based on the value of an expression?

14. Find the output of the following code.

       class overload 

       {

            int x;

     	double y;

            void add(int a , int b) 

            {

                x = a + b;

            }

            void add(double c , double d)

            {

                y = c + d;

            }

            overload() 

            {

                this.x = 0;

                this.y = 0;

            }        

        }    

        class Overload_methods 

        {

            public static void main(String args[])

            {

                overload obj = new overload();   

                int a = 2;

                double b = 3.2;

                obj.add(a, a);

                obj.add(b, b);

                System.out.println(obj.x + " " + obj.y);     

            }

       }

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