Java Lambda method reference not working

Question

My original code is this:

private static void onClicked(MouseEvent event) {
    // code to execute
}

// somewhere else in the program:
setOnMouseClicked(event -> SomeClass.onClicked(event));

But IntelliJ says "Can be replaced with method reference" which I'm not too sure how to do. I thought I would do this:

setOnMouseClicked(event -> SomeClass::onClicked);

But then that tells me "void is not a functional interface", but I don't want to return anything. I just want the handler to execute. How can I fix this?

Thank you!

Eran · Accepted Answer · 2015-11-26 12:21:41Z

40

You are mixing a lambda expression with a method reference.

Change

setOnMouseClicked(event -> SomeClass::onClicked);

to

setOnMouseClicked(SomeClass::onClicked);

answered Nov 26, 2015 at 12:21

Eran

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2 Comments

Prim Over a year ago

@Mayron FIY, IntelliJ can change a lambda expression with method reference for you (when it is possible). Just use alt+enter shortcut on expression

Mayron Over a year ago

@Prim Thanks, just tried it out. Very useful to know!

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