ArrayList

package com.sxt;

import java.util.ArrayList;

/**
* 狗类
* @author Administrator
*
*/
public class DogDemo {
private String name;
private int love;

public DogDemo(String name,int love){    this.name=name;    this.love=love;}public static void main(String[] args) {    DogDemo d1 = new DogDemo("小红", 99);    DogDemo d2 = new DogDemo("小黑", 90);    DogDemo d3 = new DogDemo("小白", 93);    DogDemo d4 = new DogDemo("小蓝", 88);    //创建一个集合用来装狗    ArrayList<DogDemo> ar = new ArrayList<DogDemo>();    ar.add(d1);    ar.add(d2);    ar.add(d3);    ar.add(d4);    //查看狗的数量以及信息    //1.集合的大小    System.out.println("总共有:"+ar.size()+"只狗");    System.out.println("分别是：");    System.out.println("昵称\t亲密度");    //2.遍历集合打印内容    for (DogDemo dogDemo : ar) {        System.out.println(dogDemo.name+"\t"+dogDemo.love);    }    //删除下标为零的狗    ar.remove(0);    ar.remove(0);    System.out.println("删除之后还有："+ar.size()+"只狗");    System.out.println("分别是：");    System.out.println("昵称\t亲密度");    for (DogDemo s : ar) {        System.out.println(s.name+"\t"+s.love+"\t");    }    if (ar.contains(d4)) {        System.out.println("有小蓝");    }else{        System.out.println("被偷了");    }}

}