java计算1+2+3……+n的和要求在控制台输入数字n计算1+2+3……+n的和

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入一个正整数n：");
        int n = scanner.nextInt();
        int sum = 0;
        for (int i = 1; i <= n; i++) {
            sum += i;
        }
        System.out.println("1+2+3+...+" + n + "的和为：" + sum);
    }
}