for循环，仅终止表达式与while循环

Question

Whilst browsing the Apache ActiveMQ source code, i came across a funny looking for loop..

 for (;beforeEndIndex < size;) {
     synchronizations.get(beforeEndIndex++).beforeEnd();
 }

Whats the benifit of this over using a standard while loop?

EG

while(beforeEndIndex < size){
    beforeEndIndex++;
}

Answer 1

Both do exactly the same thing.

The major difference between a for loop and a while loop is that the for loop limits the scope of the iteration counter to within the for block where as a while loop requires you to declare the iteration counter at least one block higher. In this case, as the for loop declares no iteration counter variable, there is no difference.