leetcode 341 Flatten Nested List Iterator 以及其他Iterator合集--next,stack,括号,iterator,listadd



leetcode 341 Flatten Nested List Iterator 以及其他Iterator合集--next,stack,括号,iterator,listadd

Iterator其实就是一个单链表,无法回头看。java里很多数据结构都有这个接口,使用时需要initalize,得到一个iterator. 调用next()返回的是一个object, 指向的是下一个未访问过的部分。 hasnext()返回的是boolean, 表示是否走到了结尾。


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