1.单个委托方法的实现
button.addActionListener( { println 'Implement ActionListener' } as ActionListener )
2.实现接口中的多个方法:使用映射,以每个方法的名字作为键,以方法对应的代码块作为键值,使用:分割方法名和代码块
handleFocus = [ focusGained : {msgLabel.setText("Good to see you")}, focusLost : {msgLabel.setText("Come back soon")} ] button.addFocusListener(handleFocus as FocusListener)