Loop index in java 8 [duplicate]

Question

Is there a way to use streams to write this code:

    for (int i = 0; i < list.size(); i ++) {
        if (i % 1000 == 0) {
           doSomething();
        }
        doSomethingElse(list.get(i));
   }

Thanks!

Did you mean doSomethingElse(list.get(i)); ?

Bohemian
– Bohemian ♦

2017-02-07 14:31:01 +00:00
Commented Feb 7, 2017 at 14:31 — Bohemian
– Bohemian ♦, Commented Feb 7, 2017 at 14:31

Roland · Accepted Answer · 2017-02-07 14:38:32Z

3

You could use an IntStream for that... but why should you? It looks basically the same as what you wrote, but has some overhead due to the IntStream which is not really needed here.

IntStream.range(0, list.size())
         .forEach(i -> {
           if (i % 1000 == 0) {
             doSomething();
           }
           doSomethingElse(list.get(i));
         });

Without knowing what doSomething or doSomethingElse do, it's hard to make a better proposal. Maybe you want to (or should?) partition your list beforehand?

answered Feb 7, 2017 at 14:38

Roland

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1 Comment

dardy Over a year ago

You're right. I thought that the code will be less verbose with streams but in this case, there is no need to use theme. Thanks!

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