Java replacing method with lambda

Question

I have the following method

private void initializeMoveOnClick(final Group window){
    window.addEventFilter(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
        @Override
        public void handle(MouseEvent mouseEvent) {
            //do some stuff
        }
    });
}

How do I go about replacing the overrided handle method declaration with a lambda expression?

assylias · Accepted Answer · 2014-03-23 07:14:22Z

5

You have mostly two ways to do it:

private void initializeMoveOnClick(final Group window){
    window.addEventFilter(MouseEvent.MOUSE_CLICKED, e -> runSomeMethod());
}

and:

private void initializeMoveOnClick(final Group window){
    window.addEventFilter(MouseEvent.MOUSE_CLICKED, this::eventFilter);
}
private void eventFilter(MouseEvent e) {
    //do some stuff
}

answered Mar 23, 2014 at 7:14

assylias

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Comments

Rohit Jain · Accepted Answer · 2014-03-23 06:29:18Z

3

Since EventHandler is an interface with a single method, you can replace the anonymous class with lambda expression like this:

private void initializeMoveOnClick(final Group window){
    window.addEventFilter(MouseEvent.MOUSE_CLICKED, (mouseEvent) -> {});
}

answered Mar 23, 2014 at 6:29

Rohit Jain

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