Performance of traditional for loop vs Iterator/foreach in Java

user_169651 0
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Is there any performance testing results available in comparing traditional for loop vs Iterator while traversing a ArrayList,HashMap and other collections?

Or simply why should I use Iterator over for loop or vice versa?

arraylist iterator for-loop map java
9 Answers

I don't believe that

for (T obj : collection) {

calculates .size() each time thru the loop and is therefore faster than

for (int i = 0; i < collection.size(); i++) {
user_1005650
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