Java對(duì)象數(shù)組

數(shù)組中存儲(chǔ)元素的類(lèi)型是引用類(lèi)型

package com.wkcto.chapter03.demo01;
/**
 * 對(duì)象數(shù)組
 * 	數(shù)組元素是一個(gè)對(duì)象, 數(shù)組中存儲(chǔ)的是引用類(lèi)型數(shù)據(jù)
 * 	數(shù)組元素實(shí)際上存儲(chǔ)的是對(duì)象的引用
 * 	遍歷對(duì)象數(shù)組,訪問(wèn)對(duì)象的實(shí)例成員時(shí), 注意避免出現(xiàn)空指針異常
 * @author 蛙課網(wǎng)
 *
 */
public class Test08 {

	public static void main(String[] args) {
		//定義數(shù)組,存儲(chǔ)5個(gè)Person對(duì)象
		Person[] personss = new Person[5];
		
		//給數(shù)組的元素賦值, 實(shí)際上是把對(duì)象的引用保存到數(shù)組元素中
		Person lisi = new Person("lisi", 18);
		personss[0] = lisi;
		personss[2] = new Person("feifei", 28);
		
		//遍歷數(shù)組,輸出每個(gè)元素
		for( int i = 0 ; i<personss.length; i++){
			System.out.println( personss[i] );
		}
		
		//讓數(shù)組中的所有人吃飯, 遍歷數(shù)組中的Person對(duì)象, 調(diào)用eat()
		for (Person person : personss) {
			if ( person != null ) {				
				person.eat();
			}
		}
		
	}

}


class Person{
	String name;
	int age;
	
	//吃飯
	public void eat() {
		System.out.println(name + "正在吃飯....");
	}
	
	public Person(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}
	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + "]";
	}
	
}