java对象排序Comparable

最新推荐文章于 2023-02-10 14:24:37 发布

weixin_30487701

最新推荐文章于 2023-02-10 14:24:37 发布

阅读量51

点赞数

CC 4.0 BY-SA版权

文章标签： java

原文链接：http://www.cnblogs.com/itBulls/articles/9899860.html

本文详细介绍了一个使用Java实现的Person对象，通过实现Comparable接口进行对象间的比较，并演示了如何利用Collections.sort()方法对包含Person对象的ArrayList进行排序。排序依据为年龄和分数字段，展示了在实际编程中如何有效管理和组织数据。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

/**
 * Person.java
 * testComparable
 * Copyright (c) 2018, IT版权所有.
 * @author   IT_BULL                      
*/

package testComparable;

import java.util.jar.Attributes.Name;

/**
 * 对象比较器
 */
public class Person implements Comparable<Person> {
    
    private String name;
    private int age;
    private int score;
    
    public Person() {    
        super();        
    }
    
    public Person(String name, int age, int score) {
        super();
        this.name = name;
        this.age = age;
        this.score = score;
    }

    @Override
    public int compareTo(Person o) {
        
        if(this.age > o.age) {
            return 1;
        }
        if(this.age < o.age) {
            return -1;
        }
        if(this.score > o.score) {
            return 1;
        }
        
        if(this.score < o.score) {
            return -1;
        }else {
            return 0;
        }
                
    }

    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + ", score=" + score + "]";
    }

}

/**
 * TestPerson.java
 * testComparable
 * Copyright (c) 2018, IT版权所有.
 * @author   IT_BULL                      
*/

package testComparable;

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

/**
 * 测试比较器
 */
public class TestPerson {
    public static void main(String[] args) {
        ArrayList<Person> pList = new ArrayList<>();
        
        pList.add(new Person("张三",10,80));
        pList.add(new Person("李四",10,70));
        pList.add(new Person("王五",12,60));
        pList.add(new Person("赵六",8,100));
        
        System.out.println("排序前："+pList);
        
        Collections.sort(pList);
        
        System.out.println("排序后:"+pList);
        
        
    }

}

测试结果：

排序前：[Person [name=张三, age=10, score=80], Person [name=李四, age=10, score=70], Person [name=王五, age=12, score=60], Person [name=赵六, age=8, score=100]]
排序后:[Person [name=赵六, age=8, score=100], Person [name=李四, age=10, score=70], Person [name=张三, age=10, score=80], Person [name=王五, age=12, score=60]]

转载于:https://www.cnblogs.com/itBulls/articles/9899860.html