java - External Iterator vs Internal Iterator -

what external , internal iterator in java ?

external iterator

when iterator , step on it, external iterator

for (iterator iter = var.iterator(); iter.hasnext(); ) {   object obj = iter.next();   // operate on obj } 

internal iterator

when pass function object method run on list, internal iterator

var.each( new functor() {   public void operate(object arg) {     arg *= 2;   } }); 

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edit (nov 14, 2016)

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• reformatted