Java for loop vs. while loop. Performance difference?

Question

Assume i have the following code, there are three for loop to do something. Would it run fast if i change the most outer for loop to while loop? thanks~~

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Answer 1

The difference between for and while is semantic :

• In a while loop, you will loop as long as the condition is true, which can vary a lot, because you might, in your loop, modify variables using in evluating the while condition.
• Usually, in a for loop, you loop N time. This N can be variable, but doesn't move until the end of your N loop, as usually developpers doesn't modify variables evaluated in the loop condition.

It is a way to help other to understand your code. You are not obliged not to modify for loop variables, but it is a common (and good) practice.