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public class Test {

    public static void main(String[] args) {

        // 1、创建四个狗狗对象

        Dog ououDog = new Dog("欧欧", "雪娜瑞");

        Dog yayaDog = new Dog("亚亚", "拉布拉多");

        Dog meimeiDog = new Dog("美美", "雪娜瑞");

        Dog feifeiDog = new Dog("菲菲", "拉布拉多");

        // 2、创建ArrayList集合对象并把四个狗狗对象放入其中

        List dogs = new ArrayList();

        dogs.add(ououDog);

        dogs.add(yayaDog);

        dogs.add(meimeiDog);

        dogs.add(2, feifeiDog); // 添加feifeiDog到指定位置

        // 3、输出集合中狗狗的数量

        System.out.println("共计有" + dogs.size() + "条狗狗。");

        // 4、通过foreach遍历集合显示各条狗狗信息

        for(Object object :dogs){

            Dog dog = (Dog) object;

            System.out.println(dog.getName() + "\t" + dog.getStrain());

        }

    }

}