java Frame 控件变量要怎么使用

[小骅]

public FrameEventDemo() {
		getContentPane().setLayout(null);
		
		JLabel lbable = new JLabel("New label");
		lbable.setBounds(74, 51, 54, 15);
		getContentPane().add(lbable);

		setTitle("关闭提示");										
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);			
		setBounds(100, 100, 450, 300);							
		contentPane = new JPanel();								
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);							
		contentPane.setLayout(null);
		
		JLabel lbNumber = new JLabel("New label");
		lbNumber.setBounds(75, 51, 54, 15);
		contentPane.add(lbNumber);
		
		
		addWindowListener(new WindowAdapter(){				
			@Override
			public void windowClosing(WindowEvent e){
				do_this_windowClosing(e);
			}
		});
		

		
		}
	protected void do_this_windowClosing(WindowEvent e){
		this.lbNumber.Text = "aaa";
	}

label的控件变量名改为lbNumber要怎么在protected void do_this_windowClosing(WindowEvent e)里面使用呀

[sayhiyang]

把lbNumber这个变量做成全局变量，声明到构造方法外面，然后在protected void do_this_windowClosing(WindowEvent e)里面加上this.lbNumber.setText("aaaa");