Java collections.sort()根据时间排序list

首先：定义bean然后：定义比较器最后：测试使用一.userBeanpackage com.butterfly.Class;public class user { private String name; private String sex; private int age; private String birthday;  public user(String name,String sex,int age,String birthday){  this.name = name;  this.sex = sex;  this.age = age;  this.birthday = birthday; } public String getName() {  return name; } public void setName(String name) {  this.name = name; } public String getSex() {  return sex; } public void setSex(String sex) {  this.sex = sex; } public int getAge() {  return age; } public void setAge(int age) {  this.age = age; } public String getBirthday() {  return birthday; } public void setBirthday(String birthday) {  this.birthday = birthday; }  }二.定义比较器package com.butterfly.Class;import java.util.Comparator;public class sortClass implements Comparator{ public int compare(Object arg0,Object arg1){  user user0 = (user)arg0;  user user1 = (user)arg1;  int flag = user0.getBirthday().compareTo(user1.getBirthday());  return flag; }}三.测试使用package com.butterfly.Class;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class testClass { public static void main(String[] args){  List userList = new ArrayList();  userList.add(new user("吴光雷","男",25,"19871028"));  userList.add(new user("吴桥","男",22,"19900923"));  userList.add(new user("陆晓敏","男",25,"19870728"));  userList.add(new user("王佳俊","男",23,"19890728"));  userList.add(new user("秦菁","女",23,"19891212"));   sortClass sort = new sortClass();  Collections.sort(userList,sort);  for(int i=0;i<userList.size();i++){   user temp = (user)userList.get(i);   System.out.println("姓名:"+temp.getName()+",生日:"+temp.getBirthday());  } }}输出结果：姓名:陆晓敏,生日:19870728姓名:吴光雷,生日:19871028姓名:王佳俊,生日:19890728姓名:秦菁,生日:19891212姓名:吴桥,生日:19900923