Java 8 range() of list?

Question

for (final A a : listOfAs.getList()) {
 do something (if statement), not using a
}

Is there any way to improve this code in Java 8? I.e. I want to perform something as many times as how many elements are in the list, but I will not use the element a inside the loop. For example, python has

for _ in range(n):

Is there something similar in Java 8?

Thank you.

Answer 1

You can use IntStream.range :

 IntStream.range(0,listOfAs.getList().size()).forEach(i->{...});

This won't iterate over your list.

The forEach method of IntStream accepts an IntConsumer, which is a functional interface that has the method void accept(int value). In my example I supplied a lambda expression that matches that interface. You do get the int index, whether you use it or not.

Answer 2

you can use the famous for loop:

for(int i = 0; i < listOfAs.getList().size(); i++){
}

This will not iterate through the elements of your list.

Answer 3

You can use Streams :

listOfAs.stream().forEach(Consumer c);