CODEWITHSUNDEEP
java-8java-stream
JoeG
JoeG

Reputation: 7652

Can a Java 8 Stream dispatch data to other methods?

Pre Java 8, we have all seen code like this:

List<Pair<A, B>> someList = ....
for (Pair<A, B> item : someList) {
    A leftItem = item.getLeft();
    aMethodThatProcessesTypeA(leftItem);
}

Seems like it should be simple/trivial to do via a Stream:

someList.stream()
        .map(i -> i.getLeft())
        .???

However, now I get stuck - with Streams being lazy, I am not sure how to proceed. Can anyone enlighten me?

Upvotes: 2

Views: 211

Answers (1)

Harmlezz
Harmlezz

Reputation: 8068

Try it this way:

someList.stream()
        .map(Pair::getLeft)
        .forEach(this::aMethodThatProcessesTypeA);

assuming the method aMethodThatProcessesTypeA() is defined by the same instance as the method running your Java 8 Stream Code shown above.

Upvotes: 3

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