Test : Java_21

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 keyword can be used to prevent a class from being subclassed

init	equals
final	clone

C

What is the output of this program?

import java.util.*;
    class Array {
        public static void main(String args[]) {
            int array[] = new int [5];
            for (int i = 5; i > 0; i--)
                array[5-i] = i;
            Arrays.fill(array, 1, 4, 8);
            for (int i = 0; i < 5 ; i++)
                System.out.print(array[i]);
        }
    }

12885	12845
58881	54881

C

array was containing 5,4,3,2,1 but when method Arrays.fill(array, 1, 4, 8) is called it fills the index location starting with 1 to 4 by value 8 hence array becomes 5,8,8,8,1. Output: $ javac Array.java $ java Array 58881

When does Exceptions in Java arises in code sequence?

Run Time	Compilation Time
Can Occur Any Time	None of the mentioned

A

What is the output of this program?

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

Thread[New Thread,0,main]	Thread[New Thread,1,main]
Thread[New Thread,5,main]	Thread[New Thread,10,main]

D

Which function is used to perform some action when the object is to be destroyed?

finalize()	delete()
main()	None of the mentioned

A

Which of these class is related to all the exceptions that cannot be caught?

Error	Exception
RuntimeExecption	All of the mentioned

A

Which of these methods sets every element of a List to a specified object?

set()	fill()
Complete()	add()

B

Which keyword is used by method to refer to the object that invoked it?

import	catch
abstract	this

D

Which of these lines will give an error line 1. int a=1,b=2; line 2. float c=2.0; line 3. System.out.println((a==c)+""+(c==b));

line 1	line 2
line 2 & line 3	line 3

B

Line 2 will give an error because it is an invalid declaration. Correct declaration would be float c=2.0F;

What is the output of this program?

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

Hello	World
HelloWorld	Hello World

B

Finish Test