Java定义域求和

package com.yan;

import java.util.Scanner;

public class SumAtoB {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入定义域：");
        int a = scanner.nextInt();
        int b = scanner.nextInt();
        int sum=0;
        for (a=a; a <= b; a++) {
            sum=sum+a;
        }
        System.out.println(sum);
    }
}