Weird loops used in Spliterator of Java 8 [duplicate]

Question

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• Do “nothing” while “condition” 5 answers

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));
}

Why would they use

do { } while (tryAdvance(action));

instead of

while(tryAdvance(action));

?

Are there any advantages I am not aware of?

Answer 1

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.