Generics

Generics

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Applet
  1. What is the output of this program?
    import java.util.*;
        class genericstack 
        {
            Stack  object = new Stack ();
    	public void push(E obj)
            {
                object.push(obj);
    	    }
    	public E pop()
            {
                E obj = object.pop();
    	    return obj;
    	    }
        }
        
        public class Result
        {
            public static void main(String args[])
            {
                genericstack  genericstackObj0 = new genericstack();
                genericstackObj0.push("Inteview");
                System.out.print(genericstackObj0.pop() + " ");
                genericstack  genericstackObj1 = new genericstack();
                genericstackObj1.push("Mania");
                System.out.println(genericstackObj1.pop());
            }
        }










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: D

    Inerview Mania

  1. What is the output of this program?
    import java.util.*;
        class genericstack 
        {
            Stack  object = new Stack ();
    	public void push(E obj) 
            {
                object.push(obj);
    	    }
    	    
    	public E pop()
            {
                E obj = object.pop();
    	    return obj;
    	    }
        }
        
        public class Output
        {
            public static void main(String args[])
            {
                genericstack  genericObj = new genericstack();
                genericObj.push("Interview");
                System.out.println(genericObj.pop());
            }
        }










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: A

    Interview

  1. What is the output of this program?
    import java.util.*;
        class genericstack 
        {
            Stack  object = new Stack ();
    	public void push(E obj)
            {
                object.push(obj);
    	}
    	public E pop()
            {
                E obj = object.pop();
    	    return obj;
    	}
        }
        
        public class Output
        {
            public static void main(String args[])
            {
                genericstack  genericObject = new genericstack();
                genericObject.push(50);
                System.out.println(genericObject.pop());
            }
        }










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: C

    50

  1. Which of the following reference types cannot be generic?










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: C

    Anonymous inner class

  1. What is the output of this program?
    import java.util.*;
        class genericstack  
        {
            Stack  object = new Stack ();
    	public void push(E obj)
            {
                object.push(obj);
    	}
    	public E pop()
            {
                E obj = object.pop();
    	    return obj;
    	}
        }
        
        public class Output 
        {
            public static void main(String args[])
            {
                genericstack  genericstackObj = new genericstack();
                genericstackObj.push("Interview Mania");
                System.out.println(genericstackObj.pop());
            }
        }










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: D

    genericstack’s object genericstackObj is defined to contain a integer parameter but we are sending an string parameter, which results in compilation error.

    utput.java:21: error: incompatible types: String cannot be converted to Integer
                genericstackObj.push("Interview Mania");
                                     ^
    Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
    1 error