> public class JXButton extends JButton {
>     public void onAction(void(ActionEvent) fn) {
>         ...
>     }
> }
> 

> JXButton btn = new JXButton("Click Me");
> btn.onAction( {btn.setText("Thank You")} );
> 

    button.addActionListener((ActionEvent event) {
            button.setText("Thank You");
    });

    button.addActionListener((ActionEvent event) {
>             button.setText("Thank You");
>     });

<class language="java" package="com.mycompany.java">
  <method return-type="void" static="true" access="public" name="main">
    <argument-list>
      <argument name="args" type="java.lang.String" array-type="true"/>
    <argument-list>
    <method-body>
       <![PCDATA[System.out.println("Hello World!");]]>
    </method-body>
  </method>
</class>

  public class JXButton extends JButton {
     public void onAction(void(ActionEvent) fn) {
          ...
      }
  }

// now
SomeListener l = (SomeListener) EventHandler.create(
    SomeListener.class, targetHandler, targetMethodName);
myButton.addSomeListener(l);
// with closure
myXButton.onSomeEvent({ targetHandler.targetMethod });

btn.addActionListener(ActionEvent e) {
    // code
}

button.addActionFunction({ btn.setText("Thank You") });

void(ActionEvent) handler = void(ActionEvent e) {
    btn.setText("Thank you");
}
// alternative: void(ActionEvent) handler = void(ActionEvent e) : btn.setText("Thank you");
btn.addActionListener(handler);
btn.removeActionListener(handler);

void(ActionEvent, Action) handler = void(ActionEvent e, Action a) {
    a.setName("Thank you");
    a.setEnabled(false);
}
Action action = new ClosureAction(handler);

Action action = ClosureAction.create("Click to Procress") (ClosureAction action) {
    action.setName("Thank you");
    action.setEnabled(false);
}

btn.addMouseListener(mouseEntered (MouseEvent e) {
    // your code here
});

ClosureMouseAdapter handler = new ClosureMouseAdapter();
handler.onMouseEntered = void(MouseEvent e) {
    // your code here
}
handler.onMouseExited = void(MouseEvent e) {
    // your code here
}
btn.addMouseListener(handler);

ClosureMouseAdapter handler = new ClosureMouseAdapter()
    .onMouseEntered(void(MouseEvent e) {
        // your code here
})
    .onMouseExited(void(MouseEvent e) {
        // your code here
});
btn.addMouseListener(handler);

List<String> names = Arrays.asList("Shai", "Patrick");
each(names) void(String name) {
    System.out.println(name);
}

public static class SomeStupidName implements ActionListener {
    public void actionPerformed(ActionEvent e) {
        // finally the code I wanted to write all the time!
    }
}

public static final ActionListener SOME_STUPID_NAME = new SomeStupidName();

public static final ActionListener SOME_STUPID_NAME = void(ActionEvent e) {
    // already done?!?
}

public static final ActionListener SOME_STUPID_NAME = new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        // already done?!?
    }
}

ClosureMouseAdapter handler = new ClosureMouseAdapter();
void(MouseEvent) copy = void(MouseEvent e) {
	// copy something at e.getPoint()
}
void(MouseEvent) cut = void(MouseEvent e) {
	// cut something at e.getPoint()
}
handler.onClick = void(MouseEvent e) {
	handler.onMouseDrag = e.isControlDown() ? cut : copy;
}
panel.addMouseListener(handler);
panel.addMouseMoveListener(handler);

MouseInputAdapter handler = new MouseInputAdapter() {
	// we hold the state so the user doesn't have to hold the key
	boolean isCtrlDown = false;
	public void mouseClicked(MouseEvent e) {
		isCtrlDown = e.isControlDown();
	}
	
	public void mouseDragged(MouseEvent e) {
		if(isCtrlDown) {
			// cut something at e.getPoint()
		} else {
			// copy something at e.getPoint()
		}
	}
};
panel.addMouseListener(handler);
panel.addMouseMoveListener(handler);

SwingUtilities.invokeLater {
    // code here
}

void(String,ActionEvent) printMessage = void(String text, ActionEvent e) {
    System.out.println(text);
}
btn.addActionListener(printMessage.curry("Hello World!"));
otherBtn.addActionListener(printMessage.curry("Hello Universe!"));

void(JFileChooser, ActionEvent) fileOpenHandler = void(JFileChooser jfc, ActionEvent e) {
    File selectedFile = ...
    EventBus.getInstance().fireEvent(new FileOpeningRequestEvent(selectedFile);
}
// this button will only allow directories to be chosen
JFileChooser jfc = new JFileChooser();
jfc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
openDirectoryBtn.addActionListener(fileOpenHandler.curry(jfc));
// this button will only allow files to be chosen
jfc = new JFileChooser();
jfc.setFileSelectionMode(JFileChooser.FILES_ONLY);
openFileBtn.addActionListener(fileOpenHandler.curry(jfc));