java 实现 日历 效果

package com.software.oop;

import java.util.Calendar;

import java.util.Scanner;

public final class MyCalendar2 {

private Calendar calendar; //定义一个Calendar类的属性

private int year,month;

//调用抽象类Calendar的方法

public  MyCalendar2() {

calendar = Calendar.getInstance();

}

//从键盘输入年份和月份

public void input() {

Scanner scanner = new Scanner(System.in);

System.out.println("请输入年份：");

year = scanner.nextInt();

System.out.println("请输入月份(1-12)：");

month = scanner.nextInt();

}

//判断是否闰年 和 月份的天数

public int Judgment() {

if (month == 2) {

if (year % 400 == 0 || (year %4 ==0 && year % 100 !=0)) {

return 29;

}

return 28;

}

if (month == 1 || month == 3 || month == 5 || month == 7 ||month == 8 || month == 10 || month == 12) {

return 31;

}

return 30;

}

//设置年份和月份

public void setTime() {

calendar.set(calendar.YEAR, year);

calendar.set(calendar.MONTH, month-1);

}

//显示，输出日历

public void show() {

int flag = 0;

System.out.println("-----"+calendar.get(calendar.YEAR)+"年"+(calendar.get(calendar.MONTH)+1)+"月-----");

System.out.println("日\t一\t二\t三\t四\t五\t六");

//下面两排-----非常重要的地方，将每个月的第一天，定位到那一个周的第几天---也就是说，要在前面输出几个空格

calendar.set(calendar.DAY_OF_MONTH,1); //由于DAY_OF-MONTH 与 DATE是同义词，所以此处，，可以替换为 DATE

int firstDay = calendar.get(calendar.DAY_OF_WEEK);

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

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

flag++;

}

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

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

flag++;

if (flag % 7 == 0) {

System.out.println();

}

}

}

//判断 月份 和 年份是否符合 规范

public void use(MyCalendar2 mycalendar2) {

mycalendar2.input();

if (month >=1 && month <=12 && year>0) {

mycalendar2.Judgment();

mycalendar2.setTime();

mycalendar2.show();

}else {

System.out.println("请输入正确的年份或月份");

}

}

public static void main(String[] args) {

MyCalendar2 mycalendar2 = new MyCalendar2();

mycalendar2.use(mycalendar2);

}

}

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