AbstractAction lambda

Question

IntelliJ is suggesting that I change

new AbstractAction() {
        public void actionPerformed(ActionEvent e) {
            // my code here
        }
}

to

(AbstractAction) (e) -> {
    // my code here
}

When I change my code to the suggested code above, I get the message "target type of a lambda conversion must be an interface".

Answer 1

You should implement abstract action class, so you can use it functionally.

public class FunctionalAction extends AbstractAction {

    ActionListener myaction;

    public FunctionalAction(ActionListener customaction) {
        this.myaction = customaction;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        myaction.actionPerformed(e);
    }

    public ActionListener getMyaction() {
        return myaction;
    }

    public void setMyaction(ActionListener myaction) {
        this.myaction = myaction;
    }

}

You can use this class as below:

getTexfield().getActionMap().put(actionName, new FunctionalAction(ae -> {
        }));