java实现简单的日历功能

 

package com.zx.text1;

import java.util.Scanner;//获取输入窗口函数

import java.util.Calendar;

import java.util.Date;//获取时间日期函数

import java.util.GregorianCalendar;

import  java.text.*;

public class demo3 {

       public static void main (String[] args) throws ParseException{

             

             int maxDay = 0;

             int firstDay = 0;

             int currentDay = 0;

             

             System.out.println("请输入一个日期,格式为:2019-01-01");

             Scanner sc = new Scanner(System.in);

             //获取键盘输入的时间格式

             String str = sc.nextLine();

             

             DateFormat format = new SimpleDateFormat("yyyy-MM-dd");

             Date date = format.parse(str);

             //将字符串转化为指定的日期格式

             Calendar calendar = new GregorianCalendar();

             //将日期转为日历

             calendar.setTime(date);

             maxDay = calendar.getActualMaximum(Calendar.DATE);//获取最大的数

             currentDay = calendar.get(Calendar.DATE);

             //当前日期中前天

             calendar.set(Calendar.DATE,1);

             //设置为当前页的第一天

             firstDay = calendar.get(Calendar.DAY_OF_WEEK);

             //当前日期中 当月第一天对应的星期数

             System.out.println("--------------------------------------------------");

             System.out.println("周日 \t 周一\t 周二 \t 周三 \t周四\t 周五\t 周六");

             System.out.println("---------------------------------------------------");

             

             for(int j = 1;j < firstDay;j++) {

                    //当前月之前空格输出

 

                    System.out.print("\t");

             }

             

             //输出当月每一天的号数

             for(int i = 1;i <= maxDay;i++) {

                    //表示当天日期

                    if(i == currentDay) {

                           System.out.print("");

                    }

                    System.out.print(i+"\t");

                    if((i-(8-firstDay))%7 == 0) {//7天为一个循环 输出所有的数

                           System.out.println("\n");

                           

                    }

             }

             

             

       }

}