在Java 8的Spliterator中使用的奇怪循环 [英] Weird loops used in Spliterator of Java 8
问题描述
有人知道为什么 java.util.Spliterator
实现使用do-while而不是while循环,当循环体为空时?例如, forEachRemaining
的实现是:
Does anyone know why the java.util.Spliterator
implementation uses do-while rather than while loops, when the body of the loop is empty? For instance, the implementation of forEachRemaining
is:
default void forEachRemaining(Consumer<? super T> action) {
do { } while (tryAdvance(action));
}
为什么要使用
do { } while (tryAdvance(action));
而不是
while(tryAdvance(action));
?
我有什么优势吗?我不知道?
Are there any advantages I am not aware of?
推荐答案
逻辑检查在do {}的主体之后执行。这可以通过多种方式使用,但与最后使用逻辑检查的while循环相同。因为do {}是空的,所以线程会一直等到被通知然后执行逻辑检查,而不是执行逻辑检查,然后执行逻辑检查,如果是,则等待。
The logic check executes after the body of the do{}. This can be utilized many ways but does the same thing as a while loop with logic check at the end. Because the do{} is empty the thread will wait until notified and then execute the logic check rather than execute the logic check then if true wait.
这篇关于在Java 8的Spliterator中使用的奇怪循环的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!