关于#软件测试#的问题，如何解决？

public class Calendar{

static int month = 0;
static int year = 0;

public static void main(String[] args) {


    System.out.println("input year ");
    Scanner y= new Scanner(System.in);
    year = y.nextInt();
    System.out.println("input month");
    Scanner m= new Scanner(System.in);
    month = m.nextInt();
    //month = Integer.parseInt(args[0]);//得到用户输入的月份
    if (year % 400 == 0){
        System.out.println(year+"年"+"2月有29天");
    }
            else if (year % 4 == 0)
    {if (year % 100 != 0){if (month==2){
        System.out.println(year+"年"+"2月有29天");
    }}
    }
    else{
        Calendar c = new Calendar();
        c.CalulateDay();
    }
}

static int CalulateDay() {
    if (month == 2) //使用IF分支控制判断月份拥有的天数
    {
        System.out.print(month + "月有28天");
    } else if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
        System.out.print(year+"年"+month + "月有31天");
    } else {
        System.out.print(year+"年"+month + "月有30天");
    }
    return month;
}

}

/*你这边的代码我做了一下简化，我知道你的意思，就是判断某年某月的天数，分闰年情况，可以把判断都放在你设的方法里，*  
 *还有你没传参数，所以你这边应该会总是显示2月的天数对吧，答题不易，还望**博友采纳**，可直接运行我的代码的
 *代码如下：
 */
static int month = 0;
static int year = 0;
 
public static void main(String[] args) {
 
 
    System.out.println("input year ");
    Scanner y= new Scanner(System.in);
    year = y.nextInt();
    System.out.println("input month");
    Scanner m= new Scanner(System.in);
    month = m.nextInt();

    CalulateDay(year,month);
}
 
static int CalulateDay(int year,int month) {
    if (month == 2) //使用IF分支控制判断月份拥有的天数
    {
        if(year%400==0||(year%4==0&&year%100!=0)){
            System.out.print(month + "月有29天");
        }
        else{
            System.out.print(month + "月有28天");
        }
    } else if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
        System.out.print(year+"年"+month + "月有31天");
    } else {
        System.out.print(year+"年"+month + "月有30天");
    }
    return month;
}