发布于 2017-11-18 05:55:53 | 172 次阅读 | 评论: 0 | 来源: 网友投递
Java程序设计语言
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言，是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台（即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se)）的总称。
本文实例讲述了java获取昨天日期字符串的方法。分享给大家供大家参考，具体如下：
import java.text.SimpleDateFormat;
import java.util.Date;
public class Test
{
/**
* 获取昨天的日期字符串
*
* @param nowDate
* 当前日期的字符串
* @return
*/
public static String getLastDayInfo(String nowDate)
{
String yesterday = "";
int year = 0;
int month = 0;
int day = 0;
try
{
year = Integer.parseInt(nowDate.substring(0, nowDate.indexOf("-")));
month = Integer.parseInt(nowDate.substring(
nowDate.indexOf("-") + 1, nowDate.lastIndexOf("-")));
day = Integer.parseInt(nowDate
.substring(nowDate.lastIndexOf("-") + 1));
// System.out.println("nowYear = " + year);
// System.out.println("nowMonth = " + month);
// System.out.println("dayDay = " + day);
day = day - 1;
if (day == 0)
{
month = month - 1;
if (month == 0)
{
// January
month = 12;
day = 31;
year = year - 1;
}
else
{
// not Jan.
switch (month)
{
// 1|3|5|7|8|10|12) day=31;;
case 1:
day = 31;
break;
case 3:
day = 31;
break;
case 5:
day = 31;
break;
case 7:
day = 31;
break;
case 8:
day = 31;
break;
case 10:
day = 31;
break;
case 12:
day = 31;
break;
// 4|6|9|11) day=30;;
case 4:
day = 30;
break;
case 6:
day = 30;
break;
case 9:
day = 30;
break;
case 11:
day = 30;
break;
case 2:
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
{
// leap year
day = 29;
}
else
day = 28;
}
}
}
String monthStr = "";
String dayStr = "";
if (month < 10)
{
monthStr = "0" + String.valueOf(month);
}
else
{
monthStr = String.valueOf(month);
}
if (day < 10)
{
dayStr = "0" + String.valueOf(day);
}
else
{
dayStr = String.valueOf(day);
}
yesterday = String.valueOf(year) + "-" + monthStr + "-" + dayStr;
} catch (Exception e)
{
e.printStackTrace();
}
return yesterday;
}
public static void main(String[] args) throws Exception
{
System.out.println(getLastDayInfo("2008-03-01"));
System.out.println(getLastDayInfo("2008-01-01"));
SimpleDateFormat sdf = new SimpleDateFormat("MMMM-dd-yyyy");
Date date;
String datetime = "02-14-1984";
try
{
date = sdf.parse(datetime);
System.out.println(sdf.format(date));
} catch (Exception e)
{
System.out.println(e.getMessage());
}
Date d = java.sql.Date.valueOf("2008-07-06");
System.out.println(d.toString());
}
}
希望本文所述对大家java程序设计有所帮助。