package com.shine.demo.test;

import java.io.Serializable;

public class Car implements Serializable, Comparable<Car> {

    /**

     * 序列化版本.

     */

    private static final long serialVersionUID = 5854674665110917200L;

    private Long id;

    private String name;

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    @Override

    public int compareTo(Car car) {

        if(!this.id.equals(car.getId()))

            return this.id.compareTo(car.getId());

        else if(!this.name.equals(car.getName()))

            return this.name.compareTo(car.getName());

        return 0;

    }

    @Override

    public String toString() {

        return "Car的id为：" + this.id + ",名称为：" + this.name;

    }

}

package com.shine.demo.test;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

import java.util.Set;

import java.util.TreeSet;

public class Test {

    public static void main(String[] args) {

        Car car = new Car();

        car.setId(1L);

        car.setName("小汽车");

        Car car1 = new Car();

        car1.setId(2L);

        car1.setName("货车");

        Car car2 = new Car();

        car2.setId(3L);

        car2.setName("载客小汽车");

        Car car3 = new Car();

        car3.setId(4L);

        car3.setName("出租车");

        //使用Comparable与Set进行排序

        Set<Car> cars = new TreeSet<Car>();

        cars.add(car);

        cars.add(car3);

        cars.add(car1);

        cars.add(car2);    

        for (Car carInfo : cars) {

            System.out.println(carInfo);

        }

        //常用Collections的sort排序

        List<Car> carList = new ArrayList<Car>();

        carList.add(car);

        carList.add(car3);

        carList.add(car1);

        carList.add(car2);    

        Collections.sort(carList, new Comparator<Car>() {

            @Override

            public int compare(Car car1, Car car2) {

                return (int) (car1.getId() - car2.getId());

            }

        });

        for (Car carInfoList : carList) {

            System.out.println(carInfoList);

        }

    }

}