Java collections.sort()根據時間排序list

首先：定義bean

然後：定義比較器

最後：測試使用

一.userBean

package 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.定義比較器

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.測試使用

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("吳光雷","男",25,"19871028"));
  userList.add(new user("吳橋","男",22,"19900923"));
  userList.add(new user("陸曉敏","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());
  }
 }
}

輸出結果：

姓名:陸曉敏,生日:19870728
姓名:吳光雷,生日:19871028
姓名:王佳俊,生日:19890728
姓名:秦菁,生日:19891212
姓名:吳橋,生日:19900923