Test : Java_20

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 the following is incorrect statement about packages?

Interfaces specifies what class must do but not how it does.	Interfaces are specified public if they are to be accessed by any code in the program.
All variables in interface are implicitly final and static.	All variables are static and methods are public if interface is defined pubic.

D

What is the output of this program?

class Output {
        public static void main(String args[]) 
        {    
             int x , y = 1;
             x = 10;
             if (x != 10 && x / 0 == 0)
                 System.out.println(y);
             else
                 System.out.println(++y);
        } 
    }

0	1
Runtime error owing to division by zero in if condition.	Unpredictable behavior of program.

B

What is the output of this program?

class exception_handling {
        public static void main(String args[]) {
            try {
                int i, sum;
                sum = 10;
                for (i = -1; i < 3 ;++i)
                    sum = (sum / i);
            }
            catch(ArithmeticException e) {
         System.out.print("0");         
            } 
            System.out.print(sum);
        }
    }

0	05
50	55

B

Which of these class is related to all the exceptions that can be caught by using catch?

Error	Exception
RuntimeExecption	All of the mentioned

B

Which of these keywords are used to implement synchronization?

sunchronize	syn
synch	synchronized

D

Which of these is returned by greater than, <, and equal to, ==, operator?

Integers	Floating - point numbers
Boolean	None of the mentioned

C

What is the output of this program?

class output {
        public static void main(String args[])
        { 
           String s1 = "Hello i love java";
           String s2 = new String(s1);
           System.out.println((s1 == s2) + " " + s1.equals(s2));
        }
    }

true true	false false
true false	false true

D

What is the output of this program?

 import java.util.*;
    class hashtable {
        public static void main(String args[]) {
            Hashtable obj = new Hashtable();
            obj.put("A", new Integer(3));
            obj.put("B", new Integer(2));
            obj.put("C", new Integer(8));
            obj.remove(new String("A"));
            System.out.print(obj);
        }
    }

{C=8, B=2}	[C=8, B=2]
{A=3, C=8, B=2}	[A=3, C=8, B=2]

B

What is synchronization in reference to a thread?

Its a process of handling situations when two or more threads need access to a shared resource.	Its a process by which many thread are able to access same shared resource simultaneously.
Its a process by which a method is able to access many different threads simultaneously.	Its a method that allow to many threads to access any information the require.

A

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 < 5; ++i) 
                    System.out.print(a[i]);
                int x = 1/0;
            }
            catch(ArrayIndexOutOfBoundsException e) {
         System.out.print("A");         
            }
            catch(ArithmeticException e) {      
                System.out.print("B");
            }
        }
    }

12345	12345A
12345B	Compilation Error

D

Finish Test