java简单日历

Posted 2020-08-15 zhenhong

一、使用java的calendar类写一个简单的日历

package com.calendar;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Scanner;

public class CalendarWrite {
    
    public static void main(String[] args) {
        
        Scanner scanner = new Scanner(System.in);
        
        System.out.println("请输入时间，格式：2016-10-21");
        
        String date = scanner.next();
        
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        
        try {
            Date d = dateFormat.parse(date);
            Calendar calendar = new GregorianCalendar();
            calendar.setTime(d);
            int today = calendar.get(Calendar.DATE);
            calendar.set(Calendar.MONTH, 0);
            int week = calendar.get(Calendar.DAY_OF_WEEK);
            String str = "";
            for(int i = 0; i < week - 1; i++) {
                str +=" \t";
                
            }
            System.out.println("日\t一\t二\t三\t四\t五\t六\n");
            System.out.print(str);
            for(int i = 1; i <= calendar.getActualMaximum(Calendar.DAY_OF_MONTH); i++) {
                if(i != today) {
                    System.out.print(i + "\t");
                    
                } else {
                    
                    System.out.print(i + "*\t");
                    
                }
                if((i + week - 1) % 7 == 0) {
                    System.out.println("\n");
                    
                }
                
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
        if(scanner != null) {
            
            scanner.close();
            scanner = null;
        }
        
    }

}