首先：定義bean

然後：定義比較器

最後：測試使用

一.userBean

1. package com.butterfly.Class; 
2. publicclass user { 
3.     private String name; 
4.     private String sex; 
5.     privateint age; 
6.     private String birthday; 
7.     public user(String name,String sex,int age,String birthday){ 
8.         this
   .name = name; 
9.         this.sex = sex; 
10.         this.age = age; 
11.         this.birthday = birthday; 
12.     } 
13.     public String getName() { 
14.         return name; 
15.     } 
16.     publicvoid setName(String name) { 
17.         this.name = name; 
18.     } 
19.     public String getSex() { 
20.         return sex; 
21.     } 
22.     public
    void setSex(String sex) { 
23.         this.sex = sex; 
24.     } 
25.     publicint getAge() { 
26.         return age; 
27.     } 
28.     publicvoid setAge(int age) { 
29.         this.age = age; 
30.     } 
31.     public String getBirthday() { 
32.         return birthday; 
33.     } 
34.     publicvoid setBirthday(String birthday) { 
35.         this
    .birthday = birthday; 
36.     } 
37. } 

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

1. package com.butterfly.Class; 
2. import java.util.Comparator; 
3. publicclass sortClass implements Comparator{ 
4.     publicint compare(Object arg0,Object arg1){ 
5.         user user0 = (user)arg0; 
6.         user user1 = (user)arg1; 
7.         int flag = user0.getBirthday().compareTo(user1.getBirthday()); 
8.         return flag; 
9.     } 
10. } 

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

1. package com.butterfly.Class; 
2. import java.util.ArrayList; 
3. import java.util.Collections; 
4. import java.util.List; 
5. publicclass testClass { 
6.     publicstaticvoid main(String[] args){ 
7.         List userList = new ArrayList(); 
8.         userList.add(new user("吳光雷","男",25,"19871028")); 
9.         userList.add(new user("吳橋","男",22,"19900923")); 
10.         userList.add(new user("陸曉敏","男",25,"19870728")); 
11.         userList.add(new user("王佳俊","男",23,"19890728")); 
12.         userList.add(new user("秦菁","女",23,"19891212")); 
13.         sortClass sort = new sortClass(); 
14.         Collections.sort(userList,sort); 
15.         for(int i=0;i<userList.size();i++){ 
16.             user temp = (user)userList.get(i); 
17.             System.out.println("姓名:"+temp.getName()+",生日:"+temp.getBirthday()); 
18.         } 
19.     } 
20. } 

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