按照年-月-日输入日期计算该日期是该年第几天

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package com.zhidi.loop;import java.util.Scanner;public class Mouyitian {    public static void main(String[] args){        Scanner sc=new Scanner(System.in);        System.out.println("请输入年份：");        int year=sc.nextInt();        System.out.println("请输入月份:");        int month=sc.nextInt();        System.out.println("请输入该月几号:");        int data=sc.nextInt();        int sum=0;        int m;        for(m=1;m<month;m++){        switch(month){        case 1:        case 3:        case 5:        case 7:        case 8:        case 10:        case 12:            sum+=31;            break;        case 4:        case 6:        case 9:        case 11:            sum+=30;            break;        case 2:            if(year%4==0 && (year%100!=0)||(year%400==0)){                sum+=29;            }else{                sum+=28;            }        }    }        System.out.println("该日期是本年的第"+(sum+data)+"天");    }}

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