java,求1-100之和。

package study01;

public class TestWhile {
    public static void main(String[] args) {
        int sum = 0;
        int i = 1;
        while (i <= 100) {
            System.out.println(i);

            sum += i;
            i++;
        }
        System.out.println(sum);

    }
}

結果等於 
5050