2018,2.28号发过一篇关于日期类的文章但是在后来测试的过程中发现了BUG,是关于计算周几这个功能的BUG，在测试数据时我是以2018年测试的数据，而2018的一月一号刚好是星期一，后来我换到别的年发现一月一号是星期几与计算周几有很大的关系，所以我们要确立本年度一月一号是星期几。经过完善（代码如下）
public class MyDate {
private int year;
private int month;
private int day;
String[] wekesday = new String[] { "星期四", "星期五", "星期六", "星期天", "星期一",
"星期二", "星期三" };
int[] week = new int[] { 4, 5, 6, 7, 1, 2, 3 };
public MyDate() {
super();
}
public MyDate(int year, int month, int day) {
if (!feifapanduan(year, month, day))
throw new MyDateException();
this.year = year;
this.month = month;
this.day = day;
}
/**
* 本年度第几天
*
* @return
*/
public int day() {
int years = this.year;
int months = this.month;
int days = this.day;
/*
* 计算日期在本年度的天数
*/
int sum = 0;
for (int i = 1; i < months; i++) {
sum += ym(years, i);
}
// 返回本年度多少天
return sum + days;
}
/**
* 第几周
*/
public void weeks() {
int sum = day();
int weekday = this.yiyueyihao();
int weeks = sum / 7;
if (sum <= 7 - weekday) {
int week = weeks + 1;
System.out.println("第" + week + "周");
} else if (sum == 7) {
System.out.println("第" + weeks + "周");
} else if ((sum - 7 + weekday) % 7 == 0) {
int week = (sum - 7 + weekday) / 7 + 1;
System.out.println("第" + week + "周");
} else if (weekday == 7 && (sum - 7 + weekday) % 7 != 0) {
int weekss = (sum - 7 + weekday) / 7 + 1;
System.out.println("第" + weekss + "周");
} else {
int weekss = (sum - 7 + weekday) / 7 + 2;
System.out.println("第" + weekss + "周");
}
}
/**
* 星期几
*/
public int weekxingqi() {
String[] wekesday = this.wekesday;
int year = this.year;
int sum = day();
/**
*
*
*/
int yearsum = 0;
for (int a = 1970; a < year; a++) {
if (a % 4 == 0 && a % 100 != 0 || a % 400 == 0) {
yearsum += 366;
} else {
yearsum += 365;
}
}
// 定义距70年的天数
int ymsum = yearsum + sum;
// 天数对7取余
int weekday = (ymsum) % 7;
int weeks = ((weekday + 7) - 1) % 7;
System.out.println("相距70年" + ymsum + " " + "余数" + weekday);
/**
* 循环星期数据根据余数找出星期几
*/
for (int i = 0; i < wekesday.length; i++) {
if (i == weeks) {
System.out.println("今天是" + wekesday[i]);
}
}
return yearsum;
}
/**
* 判断是否闰年，选择月份
*
* @param years
* @param month
* @return
*/
public static int ym(int years, int month) {
int days = 0;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
days = 31;
break;
case 4:
case 6:
case 9:
case 11:
days = 30;
break;
case 2:
if (years % 4 == 0 && years % 100 != 0 || years % 400 == 0) {
days = 29;
} else {
days = 28;
}
break;
default:
break;
}
return days;
}
/**
* 本年度一月一号距离70年一月一号的天数取余得到本年度一月一号是星期几
*
* @return
*/
public int yiyueyihao() {
int[] zhou = this.week;
// 本年度一月一号距70年的天数取余
int tianshu = this.weekxingqi() % 7;
int i;
int a = 0;
for (i = 0; i < zhou.length; i++) {
if (i == tianshu) {
a = zhou[i];
break;
}
}
System.out.println("本年度一月一号\t星期" + a);
return a;
}
/**
* 判断输入日期是否合法
*
* @param year
* @param month
* @param ri
* @return
*/
public static boolean feifapanduan(int year, int month, int ri) {
if (year != 0 && month > 0 && month < 13 && ri > 0
&& ri < ym(year, month)) {
return true;
}
return false;
}
@SuppressWarnings("static-access")
public static void main(String[] args) {
// TODO Auto-generated method stub
MyDate date = new MyDate(2017, 2, 5);
System.out.println("本年度第" + date.day() + "天");
date.weeks();
date.weekxingqi();
}
}
不知道还有没有BUG，感觉写得并不好，欢迎大家一起讨论，指点。
