学Java的第二天,直接上万年历!

学Java第二天直接上万年历!差点给cpu干烧了,还好多学了一个小时,成功敲进10分钟!
package com.jr.www.demo1;

import java.util.Scanner;

public class Wannianli {
    public static void main(String[] args) {
        //接收年月
        Scanner input = new Scanner(System.in);
        System.out.println("请输入年份:");
        int year = input.nextInt();
        System.out.println("请输入月份:");
        int month = input.nextInt();
        //计算输入的月份有多少天?
        int days = panDuanMonth(month, year);
        //求输入的年份距离1900年的整年天数差
        int yearNum = 0;
        for (int i = 1900; i < year; i++) {
            yearNum += panDuanPingRun(i) ? 366 : 365;
        }
        //求输入年份整月的天数差
        int monthNum = 0;
        for (int i = 1; i < month; i++) {
            monthNum += panDuanMonth(i, year);
        }
        //求输入年份,输入月份的一号是星期几
        int week = (yearNum + monthNum + 1) % 7;
        System.out.println(year + "年" + month + "月一号是星期" + week);
        //打印万年历表头
        System.out.println(year + "年" + month + "月\t\t\t\t^v");
        System.out.println("一\t二\t三\t四\t五\t六\t日\t");
        //先打印空格:将1号挤到对应的星期下面
        for (int i = 1; i <= week - 1; i++) {
            System.out.print("\t");
        }
        //打印万年历表
        for (int i = 1; i <= days; i++) {
            System.out.print(i + "\t");
            if ((yearNum + monthNum + i) % 7 == 0) {
                System.out.println();
            }
        }
    }

    /*计算是平年还是闰年*/
    public static boolean panDuanPingRun(int year) {
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
            return true;
        } else {
            return false;
        }
    }

    /*计算是大月,小月还是二月*/
    public static int panDuanMonth(int month, int year) {
        if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
            return 31;
        } else if (month == 4 || month == 6 || month == 9 || month == 11) {
            return 30;
        } else if (month == 2) {
            return panDuanPingRun(year) ? 29 : 28;
        } else {
            return -1;
        }
    }
}