Java程序对集合里的对象按对象的某个属性排序

<span style="font-size:18px;">package com.takesend.test;import java.util.ArrayList;import java.util.Collections;import java.util.Date;import java.util.List;/** * Java程序对集合里的对象按对象的某个属性排序，这个属性是日期(YYYY-MM-DD hh:mm) * @author Administrator * */public class Employee  {public static void main(String[] args) {List<Teacher> list = new ArrayList<Teacher>();Collections.sort(list);}}class Teacher implements Comparable<Teacher> {//参加工作日期private Date entry;public Date getEntry() {return entry;}public void setEntry(Date entry) {this.entry = entry;}public int compareTo(Teacher teacher) {return this.entry.compareTo(teacher.getEntry());}}</span>