java實現簡單的日歷功能

 

package com.zx.text1;

import java.util.Scanner;//獲取輸入窗口函數

import java.util.Calendar;

import java.util.Date;//獲取時間日期函數

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("請輸入一個日期,格式為:2019-01-01");

             Scanner sc = new Scanner(System.in);

             //獲取鍵盤輸入的時間格式

             String str = sc.nextLine();

             

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

             Date date = format.parse(str);

             //將字符串轉化為指定的日期格式

             Calendar calendar = new GregorianCalendar();

             //將日期轉為日歷

             calendar.setTime(date);

             maxDay = calendar.getActualMaximum(Calendar.DATE);//獲取最大的數

             currentDay = calendar.get(Calendar.DATE);

             //當前日期中前天

             calendar.set(Calendar.DATE,1);

             //設置為當前頁的第一天

             firstDay = calendar.get(Calendar.DAY_OF_WEEK);

             //當前日期中 當月第一天對應的星期數

             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++) {

                    //當前月之前空格輸出

 

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

             }

             

             //輸出當月每一天的號數

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

                    //表示當天日期

                    if(i == currentDay) {

                           System.out.print("");

                    }

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

                    if((i-(8-firstDay))%7 == 0) {//7天為一個循環 輸出所有的數

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

                           

                    }

             }

             

             

       }

}