/
Date.java
178 lines (150 loc) · 3.39 KB
/
Date.java
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package com.kyson.chapter1.section2;
public class Date {
@SuppressWarnings("unused")
private final int year;
@SuppressWarnings("unused")
private final int month;
@SuppressWarnings("unused")
private final int day;
private final int yearFirstTwo;
private static final int DAYPERWEEK = 7;
public Date(int year, int month, int day) throws Exception {
if (year < 0 || month < 0 || day < 0) {
Exception exception = new Exception("年月日要大于0");
throw exception;
}
if (month > 12) {
Exception exception = new Exception("年份要小于等于12");
throw exception;
}
switch (month) {
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
case 1: {
if (day > 31) {
Exception exception = new Exception(month + "月小于31号");
throw exception;
}
}
break;
case 2: {
if (day > 29) {
Exception exception = new Exception(month + "月小于等于29号");
throw exception;
}
boolean leapYear = this.isLeapYear(year);
if (!leapYear) {
if (day > 28) {
Exception exception = new Exception(month + "月小于等于28号");
throw exception;
}
}
}
break;
case 4:
case 6:
case 9:
case 11: {
if (day > 30) {
Exception exception = new Exception(month + "月小于30号");
throw exception;
}
}
break;
default:
break;
}
this.day = day;
this.year = year;
this.month = month;
yearFirstTwo = year / 100;
}
/**
* 判断是否为闰年
* 判断闰年的方法：闰年满足两个条件（满足一个即为闰年）
* 1、能被4整除但不能被100整除
* 2、能被400整 除
* @param year
* @return
*/
private boolean isLeapYear(int year)
{
if(year%100!=0&&year%4==0)
return true;
else if(year%100==0&&year%400==0)
return true;
else
return false;
}
public String dayOfTheWeek(){
String resultWeek = "";
int tempMonth = this.month;
int tempYear = this.year;
int tempDay = this.day;
if (this.month == 1 || this.month == 2) {
tempMonth += 12;
tempYear --;
}
int y = tempYear - yearFirstTwo * 100;
int floor1 = (int) Math.floor(y/4);
int floor2 = (int) (yearFirstTwo / 4);
int floor3 = (int) Math.floor(26 * (tempMonth+1)/10);
int w = y + floor1 + floor2 -2 * yearFirstTwo + floor3 + tempDay - 1;
int key = w % DAYPERWEEK;
if (key <0) {
key = key + 7;
}
switch (key) {
case 0:
resultWeek = "星期日";
break;
case 1:
resultWeek = "星期一";
break;
case 2:
resultWeek = "星期二";
break;
case 3:
resultWeek = "星期三";
break;
case 4:
resultWeek = "星期四";
break;
case 5:
resultWeek = "星期五";
break;
case 6:
resultWeek = "星期六";
break;
default:
break;
}
return resultWeek;
}
public String toString(){
return ""+ month + "/" + day + "/" + year;
}
public boolean equals(Object that){
if (this == that) {
return true;
}
if (that == null) {
return false;
}
Date xDate = (Date)that;
if (this.year != xDate.year) return false;
if (this.month != xDate.month) return false;
if (this.day != xDate.day) return false;
return true;
}
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
Date date = new Date(1996, 12, 5);
String week = date.dayOfTheWeek();
System.out.println( date + " is :" + week);
}
}