r/java • u/lukaseder • Sep 19 '18

JEP draft: Concise Method Bodies

http://openjdk.java.net/jeps/8209434
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u/jhg023123 Sep 19 '18

Why both = and ->?

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u/dpash Sep 19 '18

Because they do different things. = is saying that the method is the same as the method handle, and will return what ever the original method returns. -> would return a method handle (and ignore the parameter).

public boolean isEmpty(String s) = String::isEmpty;
public Predicate<String> isEmpty(String s) -> String::isEmpty;

Does that make sense?

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u/jhg023123 Sep 19 '18

Oh, I never thought about it like that. Thanks!