java实现万年历_java 寿星万年历

题目：输出万年历
提示：1900年1月1日是星期一

import java.util.Scanner;

public class Calendar {
    public static void main(String[] args){
    	Help util =new Help();
    	Scanner sc= new Scanner(System.in);
    	System.out.println("请输入年");
    	int year = sc.nextInt();
    	boolean ynleapyear = Help.ynleapyear(year);
    //	System.out.println("是否是闰年"+ynleapyear);
    	Scanner sc1= new Scanner(System.in);
    	System.out.println("请输入月");
    	int month = sc1.nextInt();
    	int getMonthdays = Help.getMonthdays(year, month);
    //	System.out.println("当前月有几天："+getMonthdays);
    	int yeartotaldays =Help.yeartotaldays(year);//每一年总天数
    	int totalmonthdays=Help.totalmonthdays(year, month);//当前年输入月前面月份的总天数
    	int sumdays = yeartotaldays+totalmonthdays;//总天数
    	//System.out.println("总天数："+sumdays);
    	int firstday =Help.firstday(sumdays);//当前月第一天是周几
    	//System.out.println("第一天是："+firstday);
    	System.out.println("周日\t周一\t周二\t周三\t周四\t周五\t周六");
    	int i =1;
    	if(i!=7){
    		for (i=0;i<firstday;i++){
        		System.out.print("\t");
        	}
    	}
    	for (i=1;i<=getMonthdays;i++){
    		System.out.print(i+"\t");
    		if((sumdays+i+1)%7==0&&i!=1){//换行i=1时会直接换行
    			System.out.println("");
    		}
    	}	
    }
}


public class Help {
	/**
	 * 判断是否是闰年
	 */
	public static boolean ynleapyear(int year) {
		if (year % 400 == 0 || year % 4 == 0 && year % 100 != 0) {
			return true;
		}
		return false;
	}

	/**
	 * 获取当前月有几天
	 */
	public static int getMonthdays(int year, int month) {
		switch (month) {
		case 1:
		case 3:
		case 5:
		case 7:
		case 8:
		case 10:
		case 12:
			return 31;
		case 4:
		case 6:
		case 9:
		case 11:
			return 30;
		default:
			if (ynleapyear(year)) {
				return 29;
			} else {
				return 28;
			}
		}
	}

	/**
	 * 获取1900年到输入年前一年的总天数
	 */
	public static int yeartotaldays(int year) {
		int days = 0;
		for (int years = 1900; years < year; years++)
			if (ynleapyear(years)) {
				days += 366;
			} else {
				days += 365;
			}
		return days;
	}

	/**
	 * 获取输入年一月到输入月前一月总天数,可以提取方法getMonthdays
	 */
	public static int totalmonthdays(int year, int month) {
		int days = 0;
		int i = 0;
		for (i = 1; i < month; i++) {
			days += getMonthdays(year, i);
		}
		return days;
	}

	/**
	 * 判断第一天是周几
	 */
	public static int firstday(int sumdays) {
		int firstday = (sumdays % 7) + 1;
		return firstday;
	}

	

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