Java Program to Display Even Numbers From 1 to 100

In this section, we will create a Java program to display even numbers from 1 to 100. To learn the Java even number program, you must have the basic knowledge of Java for loop and if statement.

We can use different ways to display even numbers:

Using Java for Loop
Using nested-if Statement
Using while Loop

Using Java for Loop

In the following example, we have declared a variable named number and initialized it with 100 (the limit to print the even number). We have used a for loop that executes up to 100 times and for each iteration of i the if statement checks the number is even or not. After printing each even number, the value if i is increased by 1.

In order to check the number, we have divided the number by 2 if it does not leave any remainder, the number is even and the print statement prints that number.

DisplayEvenNumbersExample1.java

public class DisplayEvenNumbersExample1
{
public static void main(String args[]) 
{
int number=100;
System.out.print("List of even numbers from 1 to "+number+": ");
for (int i=1; i<=number; i++) 
{
//logic to check if the number is even or not
//if i%2 is equal to zero, the number is even
if (i%2==0) 
{
System.out.print(i + " ");
}
}
}
}

Output:

List of even numbers from 1 to 100: 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100

Using nested-if Statement

The following program is slightly different from the above program because we have defined a method that contains the logic to check even number. Inside the method, we have used nested-if statement.

DisplayEvenNumbersExample2.java

public class DisplayEvennumbersExample2
{
public static void main(String[] args) 
{
System.out.println("List of even numbers: ");     
//method calling
displayEvenNumbers(1, 100); 
} 
//method that checks the number is even or not
private static void displayEvenNumbers(int number, int end) 
{ 
if(number>end) 
return; 
if(number%2==0) 
{ 
//prints the even numbers
System.out.print(number +" "); 
//calling the method and increments the number by 2 if the number is even
displayEvenNumbers(number + 2, end); 
} 
else 
{ 
//increments the number by 1 if the number is odd
displayEvenNumbers(number + 1, end); 
} 
} 
}

Output:

List of even numbers: 
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100

Using while Loop

In the following program, we have replaced the for loop with while loop.

DisplayEvenNumbersExample3.java

import java.util.Scanner;
public class DisplayEvenNumbersExample3
{
public static void main(String[] args) 
{
int number, i;
Scanner sc=new Scanner(System.in);
System.out.print("Enter the limit: ");
number = sc.nextInt();	
i=2; 
System.out.print("Lit of even numbers: ");
//the while loop executes until the condition become false
while(i<=number)
{
//prints the even number
System.out.print(i +" "); 
//increments the variable i by 2
i=i+2;
}	
}
}

Output:

Enter the limit: 100
Lit of even numbers: 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100

Next TopicJava Programs

← prev next →