Test : Java_8

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.

Select Test Type

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

Time Left - minutes :seconds

What is the output of this program?

 class newthread extends Thread {
 Thread t;
 newthread() {
     t1 = new Thread(this,"Thread_1");
     t2 = new Thread(this,"Thread_2");
     t1.start();
     t2.start();
 }
 public void run() {
     t2.setPriority(Thread.MAX_PRIORITY); 
     System.out.print(t1.equals(t2));
        }    
    }
    class multithreaded_programing {
        public static void main(String args[]) {
            new newthread();        
        }
    }

true	false
truefalse	falsefalse

D

Which of these classes is not part of Java?s collection framework?

Maps	Array
Stack	Queue

D

Queue is not a part of collection framework

Which of these statement is correct?

true and false are numeric values 1 and 0.	true and false are numeric values 0 and 1.
true is any non zero value and false is 0.	true and false are non numeric values.

D

When does a finally block get executed ?

When an exception is thrown in a try block	When the method in which finally block is present is about to return.
When an unhandled exception is thrown in a try block.	After execution has left a try catch block, no matter exception occurs or not.

D

The finally block is executed after the try catch block has completed the execution. Whether an exception occurs or not, finally block is always executed. Hence, finally block can be used to do some common cleanup under normal or exceptional conditions.

What is the output of this program?

import java.util.*;
    class vector {
        public static void main(String args[]) {
            Vector obj = new Vector(4,2);
            obj.addElement(new Integer(3));
            obj.addElement(new Integer(2));
            obj.addElement(new Integer(5));
            obj.removeAll(obj);
            System.out.println(obj.isEmpty());
        }
    }

0	1
True	False

C

firstly elements 3, 2, 5 are entered in the vector obj, but when obj.removeAll(obj); is executed all the elements are deleted and vector is empty, hence obj.isEmpty() returns true. Output: $ javac vector.java $ java vector true

Consider the following code

int number[] = new int[5];

After execution of this statement, which of the following are true? (A) number[0] is undefined (B) number[5] is undefined (C) number[4] is null (D) number[2] is 0 (E) number.length() is 5

(B), (D) & (E)	(A) & (E)
(C) & (E)	(E)

A

What is the output of this program?

class main_class {
        public static void main(String args[])
        {
            int x = 9;
            if (x == 9) { 
                int x = 8;
                System.out.println(x);
            }
        } 
    }

9	8
Compilation error	Runtime error

C

Which of these interface declares core method that all collections will have?

set	EventListner
Comparator	Collection

D

Collection interfaces defines core methods that all the collections like set, map, arrays etc will have.

What is the output of this program?

class newthread implements Runnable {
 Thread t;
        newthread() {
            t1 = new Thread(this,"Thread_1");
            t2 = new Thread(this,"Thread_2");
            t1.start();
            t2.start();
 }
 public void run() {
            t2.setPriority(Thread.MAX_PRIORITY); 
     System.out.print(t1.equals(t2));
        }    
    }
    class multithreaded_programing {
        public static void main(String args[]) {
            new newthread();        
        }
    }

true	false
truefalse	falsefalse

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);
        } 
    }

1	2
Runtime error owing to division by zero in if condition.	Unpredictable behavior of program.

B

Finish Test