java基礎——萬年曆

java基礎（switch）
判斷某年某月的某日是星期幾。

完整代碼

/**
 * Weekday
 */
import java.util.Scanner;
public class Weekday { 

   private static final  int startYear=1980;    
     public static void main(String[] args) {

        int year;int month;int day;
        int total,week,i;
System.out.println("**********************使用萬年曆**********************");
    Scanner input=new Scanner(System.in);
    System.out.println("請輸入年");
    year=input.nextInt();
    System.out.println("請輸入月");
    month=input.nextInt();
    System.out.println("請輸入日");
    day=input.nextInt();
    boolean leap=false;
    leap=(year%400==0)|(year%100!=0)&(year%4==0);
    week=1;//起始日1979——12——31是星期一
    total=year-startYear+(year-startYear+3)/4;
    for(i=1;i<=month-1;i++)
    {
        switch (i) {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
            total=total+31;

                break;
        case 4:
        case 6:
        case 9:
        case 11:
        total=total+30;
        break;
        case 2:
            if (leap)
                total=total+29;
            else
                total=total+28;
            break;


        }

    }
    total=total+day;
    week=(week+total)%7;
    //System.out.println(week);
    System.out.println("The date"+year+'-'+month+'-'+day+"is"+displayWeekDay(week));


}
private static String  displayWeekDay(int week) {
    String weekDay=null;
    switch(week)
    {
        case 0:
        weekDay="Sunday";
        break;
        case 1:
        weekDay="Monday";
        break;
        case 2:
        weekDay="Tuseday";
        break;
        case 3:
        weekDay="Wednesday";
        break;
        case 4:
        weekDay="Thursday";
        break;
        case 5:
        weekDay="Friday";
        break;
        case 6:
        weekDay="Saturday";
        break;



    }
    return weekDay;
}
}

運行：