Listing Even Numbers in Java

What are Even Numbers?

Hello pupils, what are even numbers?
Answer:
Even numbers are numbers that are divisible by 2.

They include:

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ...

Well then, let's see how we can write a programming code to make our computer list a set of even numbers in the Java language, between a given range of values.

Create a new java project; call it Arithmetic.
Create a new java class file; call it EvenNumbers.

Type out the adjoining Java code for listing even numbers.
We will see what each significant part does as we go along.

How to run Java Codes

Run the Java code from the main function class by pressing key f6 or the run symbol.

Java code for EvenNumbers class.

package arithmetic;

public class EvenNumbers {
    private int start; // Our starting point
    private final int stop; // where we will stop
    private String result; // Store result here.

    // Our constructor
    public EvenNumbers(int first, int last) {
        start = first;
        stop = last;
        result = "Even numbers between " + first + " and " + last + " are: \n";
    }

    public String prepResult() {
        /*
        * Loop from start to stop and rip out even numbers;
         */
        while (start <= stop) {
            if (start % 2 == 0) { // modulo(%) is explained below
                result = result + start + "; ";
            }
            start = start + 1; // increase start by 1
        }
        return result;
    }
}

Main Class Code.

package arithmetic;

public class Arithmetic {

    public static void main(String[] args) {
        System.out.println("Welcome to our demonstration sequels");
        System.out.println("Hope you enjoy (and follow) the lessons.");
        System.out.println("");

        /* Use the Even Number class. */
        String answer;

        EvenNumbers even_data = new EvenNumbers(1, 100); // even numbers between 1 and 100
        answer = even_data.prepResult();

        System.out.println(answer);

        System.out.println();
    }

}

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