Test : Java_23

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

Which of these lines of code will give better performance? 1. a | 4 + c >> b & 7; 2. (a | ((( 4 * c ) >> b ) & 7 ))

1 will give better performance as it has no parentheses.	2 will give better performance as it has parentheses.
Both 1 & 2 will give equal performance.	Dependent on the computer system.

C

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();
        } 
    }

150	200
Runtime error	Compilation error

A

Which of the following is a valid declaration of an object of class Box?

Box obj = new Box();	Box obj = new Box;
obj = new Box();	new Box obj;

A

What is the output of this program?

 class A {
        public int i;
        private int j;
    }    
    class B extends A {
        void display() {
            super.j = super.i + 1;
            System.out.println(super.i + " " + super.j);
        }
    }    
    class inheritance {
        public static void main(String args[])
        {
            B obj = new B();
            obj.i=1;
            obj.j=2;   
            obj.display();     
        }
   }

2 2	2 3
Runtime Error	Compilation Error

D

What is the output of this program?

class exception_handling {
        public static void main(String args[]) {
            try {
                int a[] = {1, 2,3 , 4, 5};
                for (int i = 0; i < 7; ++i) 
                    System.out.print(a[i]);
            }
            catch(ArrayIndexOutOfBoundsException e) {
         System.out.print("0");         
            }
        }
    }

12345	123450
1234500	Compilation Error

B

What is the name of the thread in output of this program?

class multithreaded_programing {
        public static void main(String args[]) {
            Thread t = Thread.currentThread();
            System.out.println(t.isAlive());        
        }
    }

0	1
true	false

A

What is the output of this program?

 class operators {
        public static void main(String args[])
        {
            int var1 = 5; 
            int var2 = 6;
            int var3;
            var3 = ++ var2 * var1 / var2 + var2;
            System.out.print(var2);
        } 
    }

10	11
12	56

C

What is the stored in the object obj in following lines of code? box obj;

Memory address of allocated memory of object.	NULL
Any arbitrary pointer	Garbage

B

Which of the following contain error? (A) int x[] = int[10]; (B) int[] y = new int[5]; (C) float d[] =

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

A

Which of these modifiers can be used for a variable so that it can be accessed from any thread or parts of a program?

transient	volatile
global	No modifier is needed

B

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