技術標籤：Java演算法及JDK原始碼探究日常小知識隨筆java

使用 Arrays.sort() 對物件陣列排序

注意:

使用此方法時, 必須實現 Comparable 介面

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("張三", 20) ,
				new Person("張四", 18) ,
				new Person("王五", 19) ,
		};
		Arrays.sort(p)
 
;
		System.out.println(Arrays.toString(p));
		
	}

}