Java 8 Streams: List to Map with mapped values

Question

I\'m trying to create a Map from a List using Streams.

The key should be the name of the original item,

T

Answer 1

It appears to me it’s not that complicated. Am I missing something?

    return Stream.of(new Foo())
            .collect(Collectors.toMap(Foo::getName, this::doSomething));

I’m rather much into method references. If you prefer the -> notation, use

    return Stream.of(new Foo())
            .collect(Collectors.toMap(foo -> foo.getName(), foo -> doSomething(foo)));

Either will break (throw an exception) if there’s more than one Foo with the same name in your stream.