帮忙看看这个程序怎样运行。

编译过后，怎样运行？是自己输入年份和月份吗？


import java.lang.Math;
public class SwitchDemo
{
    public static void main(String[] args)
    {
        int year=Integer.parseInt(args[0]);
        int month=Integer.parseInt(args[1]);
        boolean flag=true;
        int days=-1;
    switch(month)
    {
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            days=31;
            break;
        case 4:
        case 6:
        case 9:
        case 11:
            days=30;
            break;
        case 2:
        if(year%400==0||(year%4==0&&year%100!=0))
        {
            flag=true;
            days=29;
        }
        else
        {            
            flag=false;
            days=28;
        }
    }
    if(flag)
        System.out.println(year+"年是闰年！");
    else
        System.out.println(year+"年是平年！");
    System.out.println(year+"年"+month+"是"+days+"天。");
    }
}
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