Inner class calling

Question

I've class BubblesFrame which has inner class startnewGame :

 public class startNewGame implements ActionListener{
        public void actionPerformed(ActionEvent event){

            remove(panel);
            panel = new BubbleMainPanel();
            add(panel);
            validate();
            panel.repaint();

        }
    }

in class Menu i'd like to add event handler startNewGame

 ActionListener listener = new BubblesFrame.startNewGame();
        newGame.addActionListener(listener);

but it returns following error:

No enclosing instance of type BubblesFrame is accessible. Must qualify the allocation with an enclosing instance of type BubblesFrame (e.g. x.new A() where x is an instance of BubblesFrame)

what's wrong with my inner class?

That is because you forgot to instantiate your inner class with a new keyword. — user3437460, Aug 27 '15 at 21:45

score 1 · Answer 1 · edited Aug 27 '15 at 21:46

1

Make startNewGame class static.

edited Aug 27 '15 at 21:46

Francisco Romero

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answered Aug 27 '15 at 21:40

Raman Shrivastava

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score 0 · Answer 2 · answered Aug 27 '15 at 21:42

0

If your inner class is not static use this approach:

 ActionListener listener = new BubblesFrame().new startNewGame();

if startNewGame class is static you can do as you have done before:

ActionListener listener = new BubblesFrame.startNewGame();

answered Aug 27 '15 at 21:42

ka4eli

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score 0 · Accepted Answer · answered Aug 27 '15 at 21:51

You did instantiate your outer class, but you forgot to instantiate your inner class.

BubblesFrame f = new BubblesFrame();  //Instantiate outer class
ActionListener listener = f.new startNewGame(); //Instantiate inner class

I am more curious why would you want to expose your inner class when it is a listener for your BubblesFrame. You might want to look into your design pattern again.

Usually it is either an anonymous class or a private class.

Inner class calling

3 Answers3