新手问一个关于java集合,Iterator的代码问题>>>>>打印方法一只打印出两个，方法二打印全都打印出来了

Question

public class Test {

public static void main(String[] args) {
    Dog ououDog =new Dog("欧欧","雪瑞娜");     //构造函数，参数是name和strain
    Dog meimeiDog =new Dog("美美","拉布拉多");
    Dog yayaDog =new Dog("亚亚","雪瑞娜");
    Dog feifeiDog =new Dog("菲菲","拉布拉多");

    Map<String,Dog> lists =new HashMap<String,Dog>();
    lists.put(ououDog.getName(),ououDog);
    lists.put(meimeiDog.getName(), meimeiDog);
    lists.put(feifeiDog.getName(),feifeiDog);
    lists.put(yayaDog.getName(),yayaDog);

    Set<String> keys =lists.keySet();
    Iterator<String> it =keys.iterator();


    //打印方法一
    while(it.hasNext()){

        System.out.println(it.next()+"\t"+lists.get(it.next()).getStrain());
    }

    //打印方法二
    while(it .hasNext()){
        String key =it.next();
        Dog dog =lists.get(key);
        System.out.println(key+"\t"+dog.getStrain());
    }
}

}

Answer 1

你的打印方法一动用了两次it.next，没吊用一次指针就会往下移一个，所以你打印不全，而且每次打印的数据应该也不是对应的，如果答案是对的，请赐给我c币， 谢谢大佬。