如果List中Object实现了Comparator接口，便可以直接用以下的方式对List进行排序 如List list，通过list.add("abc")等操作为list添加了一些元素，通过以下代码即可完成排序： Collections.sort(list) 由于使用了默认的排序规则，所以sort只传

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

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