java比较器的使用

java比较器的基本实现有两种方式，一种是直接实现Comparable接口，一种是建立一个Comparator

两种方式差不多，但比较的结果却有不一样之处

Main.java

import java.util.Arrays;import com.enson.chan.Person;public class Main {public static void main(String[] args) {Person person[] = { new Person(10, 120), new Person(18, 100),new Person(13, 100), new Person(15, 90) };for(Person per:person){System.out.println(per);}System.out.println("=======");//此处使用的是Comparable比较器方式Arrays.sort(person);for(Person per:person){System.out.println(per);}}}

直接实现Comparable

package com.enson.chan;public class Person implements Comparable<Person> {private int age;private int height;public int getAge() {return age;}public void setAge(int age) {this.age = age;}public int getHeight() {return height;}public void setHeight(int height) {this.height = height;}public Person(int age, int height) {super();this.age = age;this.height = height;}@Overridepublic int compareTo(Person person) {if (this.getAge() > person.getAge()) {return 1;} else if (this.getAge() < person.getAge()) {return -1;} else {return 0;}}@Overridepublic String toString(){return this.getAge()+"|"+this.getHeight();}}

设计PersonComparator，此时的Person中不需要有compareTo方法

package com.enson.chen;import java.util.Comparator;public class PersonComparator implements Comparator<Person> {@Overridepublic int compare(Person arg0, Person arg1) {if (arg0.getAge() > arg1.getAge()) {return -1;} else if (arg0.getAge() < arg1.getAge()) {return 1;} else {return 0;}}}

运行结果：

10|12018|10013|10015|90=======10|12013|10015|9018|100

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