java线性表排序示例分享

大家可以先看一下这个静态方法public static void sort(List list, Comparator c)

1.先定义一个模型：

复制代码 代码如下:
package model;

public class User
{
    private String userName;
    private int userAge;

    public User()
    {
    }

    public User(String userName, int userAge)
    {
        this.userName = userName;
        this.userAge = userAge;
    }

    public String getUserName()
    {
        return userName;
    }

    public void setUserName(String userName)
    {
        this.userName = userName;
    }

    public int getUserAge()
    {
        return userAge;
    }

    public void setUserAge(int userAge)
    {
        this.userAge = userAge;
    }
}

2.然后定义一个比较器，实现java.util.Comparator接口，在compare()方法编写比较规则：

复制代码 代码如下:
package util;

import java.util.Comparator;

import model.User;

public class ComparatorUser implements Comparator
{
    @Override
    public int compare(User arg0, User arg1)
    {
        // 先比较名字
        int flag = arg0.getUserName().compareTo(arg1.getUserName());

        // 如果名字一样，就比较年龄
        if (flag == 0)
        {
            return arg0.getUserAge() - arg1.getUserAge();
        }
        return flag;
    }
}

3.排序的时候用java.util.Collections里面的sort(List list, Comparator c)方法：

复制代码 代码如下:
package test;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import util.ComparatorUser;
import model.User;

public class TestApp
{
    public static void main(String[] arg0)
    {
        List userList = new ArrayList();

        // 插入数据
        userList.add(new User("A", 15));
        userList.add(new User("B", 14));
        userList.add(new User("A", 14));

        // 排序
        Collections.sort(userList, new ComparatorUser());

        // 打印结果
        for (User u : userList)
        {
            System.out.println(u.getUserName() + " " + u.getUserAge());
        }
    }
}

4.运行结果：

复制代码 代码如下:
A 14
A 15
B 14