Using the while loop to calculate sum : While Loop « Statement Control « Java Tutorial

1. Java Tutorial
2. Statement Control
3. While Loop

public class MainClass {
  public static void main(String[] args) {
    int limit = 20;
    int sum = 0;
    int i = 1;

    while (i <= limit) {
      sum += i++;
    }
    System.out.println("sum = " + sum);
  }
}

sum = 210