输入两个数求其中的质数之和和个数

public static void susu() {
        int count = 0, i, j, m, n, sum = 0;
        System.out.println("请输入两个整数：");
        Scanner in2 = new Scanner(System.in);
        m = in2.nextInt();
        n = in2.nextInt();
        sum = 0;
        count = 0;
        if (m == 1 && n == 1) {
            System.out.println("对不起，您的输入有误！");
        }
        for (j = m; j <= n; j++) {
            int count2 = 0;// 用于判断每个数的因数是否为2
            for (i = 1; i <= j; i++) {
                if (j % i == 0) {
                    count2++;
                }
            }
            if (count2 == 2) {
                count++;
                sum += j;
                System.out.print(j + " ");
            }
        }
        System.out.println();
        System.out.println("count=" + count + ", sum=" + sum);
    }