Java 实现对象数组排序

使用 Arrays.sort() 对对象数组排序

注意:

使用此方法时, 必须实现 Comparable 接口

package com.cwq.beyond;

import java.text.SimpleDateFormat;
import java.util.Arrays;

class Person implements Comparable<Person>{

	private String name;
	private int age;
	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + "]";
	}
	public Person(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}
	
	@Override
	public int compareTo(Person o) {
		if (this.age > o.age) {
			return 1;
		}else if (this.age < o.age) {
			return -1;
		}else {
			return 0;
		}
	}
	
}

public class TestDemo {
	public static void main(String[] args) throws Exception {

		Person p[] = new Person[] {
				new Person("张三", 20) ,
				new Person("张四", 18) ,
				new Person("王五", 19) ,
		};
		Arrays.sort(p);
		System.out.println(Arrays.toString(p));
		
	}

}