参考答案
Queue的element()和peek()方法的区别:
- Queue 中 element() 和 peek() 都是用来返回队列的头元素,不删除;
- 在队列元素为空的情况下,element() 方法会抛出NoSuchElementException异常,peek() 方法只会返回 null。
JDK1.8 中源码解释:
/** * Retrieves, but does not remove, the head of this queue. This method * differs from {@link #peek peek} only in that it throws an exception * if this queue is empty. * * @return the head of this queue * @throws NoSuchElementException if this queue is empty */ E element(); /** * Retrieves, but does not remove, the head of this queue, * or returns {@code null} if this queue is empty. * * @return the head of this queue, or {@code null} if this queue is empty */ E peek();
以上,是Java面试题【Queue的element()和peek()方法有什么区别】的参考答案。
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