Page 200 - CTS - CSA TP - Volume 2

COMPUTER SOFTWARE APPLICATION - CITS

Explanation:
1 Package Declaration (package p2;): Specifies that the Sub class belongs to the p2 package.
2 Import Statement (import java.util.Scanner;): Imports the Scanner class from the java.util package, which
is used for reading user input.
3 Class Definition (public class Sub { ... }): Defines the Sub class.
4 Instance Variable (int d;): Declares an instance variable d to store the difference between two numbers.
5 Method Definition (public void diff() { ... }): Defines a method named diff that calculates and displays the
difference between two numbers.
6 Scanner Initialization (Scanner scan = new Scanner(System.in);): Creates a Scanner object to read input
from the console.
7 User Input and Calculation (int x = scan.nextInt();, int y = scan.nextInt();, d = x - y;): Prompts the user to
enter two numbers, reads the input, and calculates the difference.

8 Output Display (System.out.println(“Difference = “ + d);): Displays the calculated difference.
9 Resource Cleanup (scan.close();): Closes the Scanner object to release system resources.
10 Main Method (public static void main(String[] args) { ... }): The entry point of the program. Creates an instance
of the Sub class and calls the diff method for testing.

Output:

This program demonstrates basic input/output operations and the use of the Scanner class to interact with the
user.

TASK 2: Example: Using a Package (Another Example)
Step 1: Create a Package

Create a folder named myPackage and save two Java files inside it.
Step 2: Create Classes inside the Package
1. MyMath.java
// Inside the ‘myPackage’ folder
package myPackage;

public class MyMath {
public static int add(int a, int b) {
return a + b;
}

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CITS : IT & ITES - Computer Software Application - Exercise 115