Test : Java_24

This test contains 10 questions based on Java.
Each question answered correctly awards you 1 point and each incorrect answer has a penalty of -0.25 points, no points are deducted for unattempted answers.

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You Get +1 for each correct answer and -0.25 for each incorrect answer

Time Left - minutes :seconds

What is the order of precedence (highest to lowest) of following operators? 1. & 2. ^ 3. ?:

1 -> 2 -> 3	2 -> 1 -> 3
3 -> 2 -> 1	2 -> 3 -> 1

A

What is the process by which we can control what parts of a program can access the members of a class?

Recursion	Polymorphism
Abstraction	Encapsulation

D

What is the output of this program?

class ternary_operator {
        public static void main(String args[]) 
        {        
             int x = 3;
             int y = ~ x;
             int z;
             z = x > y ? x : y;
             System.out.print(z);
        } 
    }

0	1
3	-4

C

Which of the following statements about abstract methods/classes in Java are true? (A)An abstract class cannot be instantiated. (B)Constructors cannot be abstract. (C)All sub classes of an abstract class must override the abstract methods. (D)Static methods may be declared abstract.

(A) & (B)	(B) & (C)
(C) & (D)	(A) & (D)

A

what will be the output of int i=12; System.out.println(++i);

11	12
13	14

C

++i will first increment the value of i then use it Therefore ++i=12+1 =13

What is the Message is displayed in the applet made by this program?

import java.awt.*;
    import java.applet.*;
    public class myapplet extends Applet {
        public void paint(Graphics g) {
            g.drawString("A Simple Applet", 20, 20);    
        }
    }

A Simple Applet	A Simple Applet 20 20
Compilation Error	Runtime Error

A

What is the output of this program?

class box {
        int width;
        int height;
        int length;
        int volume;
        void finalize() {
            volume = width*height*length;
            System.out.println(volume);
        }
        protected void volume() {
            volume = width*height*length;
            System.out.println(volume);
       } 
    }    
    class Output { 
        public static void main(String args[])
        {
            box obj = new box();
            obj.volume();
        } 
    }

Runtime error	Compilation error
150	200

C

Which of these class is used to make a thread?

String	System
Thread	Runnable

C

Which operator is used by Java run time implementations to free the memory of an object when it is no longer needed?

delete	new
free	None of the mentioned

D

What is the output of this program?

 class exception_handling {
        public static void main(String args[]) {
            try {
                System.out.print("Hello" + " " + 1 / 0);
            }
            finally {
         System.out.print("World");         
            }
        }
    }

A	B
Compilation Error	Runtime Error

B

Finish Test