package com.zwg.calweek;

import java.time.MonthDay;

import java.util.Scanner;

public class CalMain {

public static void main(String[] arge){

Scanner sc=new Scanner(System.in);

int year,month,day;

while(true){

System.out.println("我可以计算你输入的日期是星期几,请依次输入年月日");

System.out.println("请输入年份:");

year=sc.nextInt();

while(year<1900){

System.out.println("我还无法计算1900之前的日期");

System.out.println("请重新输入年:");

year=sc.nextInt();

}

System.out.println(CheckDay.isLeap(year));

System.out.println("请输入月份:");

month=sc.nextInt();

while(month>12||month<1){

System.out.println("月份输入错误,请重新输入:");

month=sc.nextInt();

}

System.out.println("请输入日:");

day=sc.nextInt();

while(!CheckDay.checkDay(year,month,day)){

day=sc.nextInt();

}

System.out.println("日期输入完毕,正在计算...");

FinalCal.finalCal(year, month, day);

}

}}

/*---------------------------------------------------------------------------*/

package com.zwg.calweek;   public class CheckDay { public static boolean isLeap(int year){  boolean mark=false; if((year%4==0&&year%100!=0)||year%400==0) mark=true;   return mark; }  public static boolean checkDay(int year, int month,int day){  switch(month){ case 1: case 3: case 5: case 7: case 8: case 10: case 12: if(day<1||day>31) return false; break; case 4: case 6: case 9: case 11: if(day<1||day>30) return false; break; case 2: if(isLeap(year)){ if(day<1||day>29) { System.out.println(year+"年2月有29天"); return false; } } else { if(day<1||day>28) { System.out.println(year+"年2月有28天"); return false; } }break; default: System.out.println("Error! checkDay函数出错"); } return true;   } }/*------------------------------------------------------------------------------------------*/

package com.zwg.calweek;   public class FinalCal { public static void finalCal(int year,int month,int day){ /**1.计算该年与1900年间有几个闰年,有几个,就额外+几天;  * 1904是第一个闰年;   */ int y=year-1904,count=0; if(y>=0)   count=y/4+1; int total; total=(year-1900)*365+calMonth(month-1)+day+count; int week=total%7; System.out.print(year+"年"+month+"月"+day+"日是星期"); switch(week){ case 1: System.out.println("一");break; case 2: System.out.println("二");break; case 3: System.out.println("三");break; case 4: System.out.println("四");break; case 5: System.out.println("五");break; case 6: System.out.println("六");break; case 7: System.out.println("日");break; default: System.out.println("error week"); } System.out.println(); } public static int calMonth(int month){ switch(month){ case 0:return 0; case 1:return 31; case 2:return 31+28; case 3:return 31+28+31; case 4:return 31+28+31+30; case 5:return 31+28+31+30+31; case 6:return 31+28+31+30+31+30; case 7:return 31+28+31+30+31+30+31; case 8:return 31+28+31+30+31+30+31+31; case 9:return 31+28+31+30+31+30+31+31+30; case 10:return 31+28+31+30+31+30+31+31+30+31; case 11:return 31+28+31+30+31+30+31+31+30+31+30; case 12:return 31+28+31+30+31+30+31+31+30+31+30+31; default: System.out.println("Error! calMonth"); return 0; } }   }