学步园

除了使用正则表达式外，使用java自带的类也能完成类似的功能...

Calendar.get(Calendar.DAY_OF_WEEK)得到的int值，一周的第一天从Sunday开始，即

SUNDAY
         == 1

MONDAY         

TUESDAY,

WEDNESDAY,

THURSDAY,

FRIDAY,

SATURDAY      == 7

方法一：

思路：

1.使用Timestamp类的valueOf(String str)方法，返回得到一个Timestamp类的对象

2.Timestamp类转成Calendar类

说明：Timestamp类是Date的子类

import java.sql.Timestamp;<br /> import java.util.Calendar;<br /> import java.util.Date;<br /> import java.util.GregorianCalendar;<br /> public class Weekend {<br /> public static void main(String[] args) {<br /> String str = "2010-08-16 20:39:40.0";<br /> Timestamp ts = Timestamp.valueOf(str);<br /> //Timestamp类就是Date类的子类<br /> //GregorianCalendar calendar = new GregorianCalendar();<br /> //GregorianCalendar格林尼治时间，继承Calendar类<br /> Calendar calendar = Calendar.getInstance();<br /> calendar.setTime(ts);<br /> isWeekend(calendar);<br /> }</p> <p> public static boolean isWeekend(Calendar c) {<br /> int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);<br /> if(dayOfWeek != 1 && dayOfWeek != 7) {<br /> System.out.println(dayOfWeek);<br /> System.out.println("好好工作");<br /> return true;<br /> }<br /> System.out.println(dayOfWeek);<br /> System.out.println("出去游玩");<br /> return false;<br /> }<br /> }

方法二：

思路：

1.通过SimpleDateFormat类的parse()方法，把String转换成Date类

2.把Date转换成Calendar类，然后随心所欲转换

import java.util.Calendar;<br /> import java.util.Date;<br /> import java.text.DateFormat;<br /> import java.text.SimpleDateFormat;<br /> public class Weekend2 {<br /> public static void main(String[] args) {<br /> String dateString = "2010-08-22";<br /> DateFormat df = new SimpleDateFormat("yyyy-MM-dd");<br /> Calendar calendar = Calendar.getInstance();<br /> Date date;<br /> try {<br /> date = df.parse(dateString);<br /> //df.parse()返回的是一个Date类<br /> calendar.setTime(date);<br /> if(calendar.get(Calendar.DAY_OF_WEEK)==1 || calendar.get(Calendar.DAY_OF_WEEK)==7) {<br /> System.out.println(dateString + " is weekend !");<br /> } else {<br /> System.out.println(dateString + " is not weekend ");<br /> }<br /> } catch (java.text.ParseException e) {<br /> e.printStackTrace();<br /> }</p> <p> }<br /> }