Write a Java Program to Calculate Sum of Even Numbers from 1 to N using For Loop, and While Loop with example. Any number that is divisible by 2 is an even number.
Java Program to Calculate Sum of Even Numbers Example 1
This Java program allows the user to enter the maximum limit value. Next, this Java program finds the sum of even numbers from 1 to maximum limit value using For Loop and If statement.
TIP : We already explained the logic to check the number is Even or Not in Java Odd or Even Program article in Java.
// Java Program to Calculate Sum of Even Numbers using for loop import java.util.Scanner; public class SumofEven1 { private static Scanner sc; public static void main(String[] args) { int number, i, evenSum = 0; sc = new Scanner(System.in); System.out.print(" Please Enter any Number : "); number = sc.nextInt(); for(i = 1; i <= number; i++) { if(i % 2 == 0) { evenSum = evenSum + i; } } System.out.println("\n The Sum of Even Numbers upto " + number + " = " + evenSum); } }

First, we used the For loop to iterate from 1 to maximum value (Here, number = 5). Next, the If condition to check whether the remainder of the number divided by 2 is exactly equal to 0 or not.
User entered value for this Java Program to find Sum of Even Numbers : number = 5
For Loop First Iteration: for(i = 1; i <= 5; i++)
if(i % 2 == 0) => if(1 % 2 == 0) – Condition is False
Second Iteration: for(i = 2; 2 <= 5; 2++)
if(2 % 2 == 0) – Condition is True.
evenSum = evenSum + i
evenSum = 0 + 2 = 2
Third Iteration: for(i = 3; 3 <= 5; 3++)
if(3 % 2 == 0) – False
Fourth Iteration: for(i = 4; 4 <= 5; 4++)
if(4 % 2 == 0) – True.
evenSum = evenSum + i
evenSum = 2 + 4 = 6
Fifth Iteration: for(i = 5; 5 <= 5; 5++)
if(5 % 2 == 0) – False
Sixth Iteration: for(i = 6; 6 <= 5; 6++)
Condition (6 <= 5) is False. So, the Java compiler exits from the For Loop
Java Program to Calculate Sum of Even Numbers Example 2
In this Java program, we used for loop without the If statement. If you observe the below Java code, we started i from 2 and incremented by 2 (not 1). It means, for the first iteration i = 2, and for the second iteration i = 4 (not 3) so on.
// Java Program to Calculate Sum of Even Numbers import java.util.Scanner; public class SumofEven2 { private static Scanner sc; public static void main(String[] args) { int number, i, evenSum = 0; sc = new Scanner(System.in); System.out.print(" Please Enter any Number : "); number = sc.nextInt(); for(i = 2; i <= number; i = i + 2) { evenSum = evenSum + i; } System.out.println("\n The Sum of Even Numbers upto " + number + " = " + evenSum); } }
Java Sum of Even Numbers using for loop output
Please Enter any Number : 25
The Sum of Even Numbers upto 25 = 156
Java Program to Calculate Sum of Even Numbers Example 3
This Java program to find the sum of even numbers is the same as the second example, but we are using the While Loop.
// Java Program to find Sum of Even Numbers using While Loop import java.util.Scanner; public class SumofEven5 { private static Scanner sc; public static void main(String[] args) { int number, i = 2, evenSum = 0; sc = new Scanner(System.in); System.out.print(" Please Enter any Number : "); number = sc.nextInt(); while(i <= number) { evenSum = evenSum + i; i = i + 2; } System.out.println("\n The Sum of Even Numbers upto " + number + " = " + evenSum); } }
Please Enter any Number : 35
The Sum of Even Numbers upto 35 = 306
Java Program to Calculate Sum of Even Numbers using Method
This program is the same as the first example. But we separated the logic and placed it in a separate method.
// Java Program to find Sum of Even Numbers import java.util.Scanner; public class SumofEven3 { private static Scanner sc; public static void main(String[] args) { int number, evenSum = 0; sc = new Scanner(System.in); System.out.print(" Please Enter any Number : "); number = sc.nextInt(); evenSum = sumOfEven(number); System.out.println("\n The Sum of Even Numbers upto " + number + " = " + evenSum); } public static int sumOfEven(int num) { int i, sum = 0; for(i = 1; i <= num; i++) { if(i % 2 == 0) { sum = sum + i; } } return sum; } }
Please Enter any Number : 45
The Sum of Even Numbers upto 45 = 506
Java Program to find Sum of Even Numbers between a Given Range
This Java program allows the user to enter Minimum and maximum value. Next, the Java program calculates the sum of even numbers between Minimum value and maximum value.
// Java Program to Calculate Sum of Even Numbers between Maximum and Minimum import java.util.Scanner; public class SumofEven4 { private static Scanner sc; public static void main(String[] args) { int minimum, maximum, evenSum = 0; sc = new Scanner(System.in); System.out.print(" Please Enter the Minimum value : "); minimum = sc.nextInt(); System.out.print(" Please Enter the Maximum value : "); maximum = sc.nextInt(); evenSum = sumOfEven(minimum, maximum); System.out.println("\n The Sum of Even Numbers from " + minimum + " to " + maximum + " = " + evenSum); } public static int sumOfEven(int minimum, int maximum) { int i, sum = 0; if(minimum % 2 != 0) { minimum++; } for(i = minimum; i <= maximum; i++) { if(i % 2 == 0) { sum = sum + i; } } return sum; } }
Please Enter the Minimum value : 10
Please Enter the Maximum value : 75
The Sum of Even Numbers from 10 to 75 = 1386