Competitive Programming Lab Quiz- 4B

public class Solution{

       public static void main(String[] args){

                     short x = 10;

                     x =  x * 5;

                     System.out.print(x);

       }

}

• The code will print 50
• The code will print 10
• compilation Error

• Generates Exception

public class Solution{

       public static void main(String[] args){

               int[]  x = {120, 200, 016};

               for(int i = 0; i < x.length; i++){

                        System.out.print(x[i] + “ “);

               }                  

       }

}

• 120 200 16
• 120 200 016
• 120 200 14
• none

Identify the correct restriction on static methods.

1. I. They must access only static data

2. II. They can only call other static methods.

3. III. They cannot refer to this or super.

• I and II

• II and III

• Only III

• All of the above

public class ArraysInJava

{

public static void main(String[] args)

{

int[] i = new int[-1];

i[1]=20;

System.out.println(i[1]);

}

}

• This code will compile and run without any issues with the output 20

• This code will throw an ArrayIndexOutOfBoundsException
• This code will throw a NegativeArraySizeException
• This code will throw a NullPointerException

Identify the corrected definition of a package.

 

• A package is a collection of editing tools

• A package is a collection of classes

• A package is a collection of classes and interfaces

• A package is a collection of interfaces

What will be the output of following Java code?

public class Main {

  public static void main(String arg[]) {

    int i;

    for (i = 1; i <= 12; i += 2) {

      if (i == 8) {

        System.out.println(i);

        break;

      }

    }

  }

}

• 8
• 1, 3, 5, 7, 9, 11
• 1, 3, 5, 7
• No output

import java.util.Scanner;

 

class ThisKeyword {

  private int a = 4;

  private int b = 1;

 

  void getSum(int a, int b) {

    this.a = a;

    this.b = b;

    System.out.println(this.a + this.b);

  }

}

 

public class Main {

  public static void main(String args[]) {

    ThisKeyword T = new ThisKeyword();

    T.getSum(3, 5);

  }

}

• The output will be 8
• The output will be 5
• The output will be 9
• The output will be 7

The super() method is used to ___.

• Call a method from the parent class
• Create a new instance of a class
• Override a method in the child class
• Delete an instance of a class

Class can extend another class and also implement two more interface in to the same class?

• Yes, a class can extend another class and implement two more interfaces into the same class
• No, a class cannot extend another class
• No, a class cannot implement interfaces
• No, a class can either extend another class or implement interfaces, not both

Which of the following ways is the correct way to create an object in Java?

• Using the new keyword

• Using newInstance() method

•   clone() method

• All of the above