題目

https://leetcode.com/problems/peeking-iterator/

題解

一句話解釋題意：標準的 iter 接口不包含 peek 功能，本題希望你能夠增加這個功能。

// Java Iterator interface reference: // https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.htmlclass PeekingIterator implements Iterator<Integer> {Iterator<Integer> iter;Integer num;public PeekingIterator(Iterator<Integer> iterator) {// initialize any member here.iter = iterator;if (iterator.hasNext())num = iterator.next();}// Returns the next element in the iteration without advancing the iterator.public Integer peek() {return num;}// hasNext() and next() should behave the same as in the Iterator interface.// Override them if needed.@Overridepublic Integer next() {Integer ret = num;if (iter.hasNext())num = iter.next();elsenum = null;return ret;}@Overridepublic boolean hasNext() {return num != null;} }

總結

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