集合测试题

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class CollectionExercise {
    @SuppressWarnings({"all"})
    public static void main(String[] args) {
        
        List list = new ArrayList();

        list.add(new Dog("富贵",5));
        list.add(new Dog("翠花",50));
        list.add(new Dog("发财",8));

        //遍历  快捷方式：  -- >  I
        for (Object dog : list) {
            System.out.println(dog);
        }

        //迭代器遍历   快捷方式： -->  itit
        System.out.println("===============");
        Iterator iterator = list.iterator();
        while (iterator.hasNext()) {
            Object next =  iterator.next();
            System.out.println(next);
        }


    }
}
class Dog{
    private String name;
    private int age;

    public Dog(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Dog{" +
                "name='" + name + ''' +
                ", age=" + age +
                '}';
    }
}