java 实现万年历

package com.direct.str;

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Scanner;

public class CalendarOne {

	/**
	 * @param args
	 */
	public static void showCalendar(int year,int month){
		String[]  weekString = {"日","	","一","	","二","	","三","	","四","	","五","	","六"};
		for (int i = 0; i <weekString.length ; i++) {
			System.out.print(weekString[i]);
		}
		System.out.println();
		Calendar c = new GregorianCalendar();
		c.set(Calendar.YEAR, year);
		c.set(Calendar.MONTH, month-1);
		c.set(Calendar.DATE,1);
		int count = c.getActualMaximum(c.DAY_OF_MONTH);//得到当月的天数
		int day_week = c.get(Calendar.DAY_OF_WEEK)-1;
		for(int i=0;i<day_week;i++){
			System.out.print("	");
		}
		for(int j=1;j<=count;j++,day_week++){
			if((day_week)%7==0){
				System.out.println();
			}
			System.out.print(j+"	");
		}
		
	}
	
	public static void main(String[] args) {
		System.out.println("<<<<<<<<万年历>>>>>>>>");
		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("-------------"+year+"年"+month+"月------------");
		CalendarOne.showCalendar(year,month);

	}

}

　　

package com.direct.str;

public class CalendarTwo {

	public static void main(String[] args) {
		
		int year = 2017;
		int month = 12;
		int totalDay = 0;
		//天数计算从1900开始，毫秒数型1970年开始
		for (int i = 1900; i < year; i++) {
			if(i%4==0 && i%100!=0 || i%400==0){
				totalDay+=366;
			}else{
				totalDay+=365;
			}
		}
		int dayM = 0;
		for (int i = 1; i <= month; i++) {
			switch (i) {
			case 1:
			case 3:
			case 5:
			case 7:
			case 8:
			case 10:
			case 12:
				dayM = 31;
				totalDay+=dayM;
				break;
			case 4:
			case 6:
			case 9:
			case 11:
				dayM = 30;
				break;
			case 2:
				if(year%4==0 && year%100!=0 || year%400==0){
					dayM = 29;
				}else{
					dayM = 28;
				}
				break;
			default:
				System.out.println("月份有错");
				break;
			}
			if(i<month){
				totalDay+=dayM;
			}
			
		}
		int temp = totalDay%7;
		int firstDayofMonth = 0;
		if(temp==7){
			firstDayofMonth = 0;
		}else {
			firstDayofMonth = temp;
		}
		System.out.println("日	一	二	三	四	五	六	");
		for(int i=0;i<firstDayofMonth;i++){
			System.out.print("	");
		}
		for(int i=1;i<= dayM;i++){
			System.out.print(i+"	");
			if((totalDay+i)%7==0){
				System.out.println();
			}
		}

		
		
	}
}