java对象排序Comparable

/**
 * 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]]