圖形將在標(biāo)題欄中保留渲染。我使用封裝在jlabel中的緩沖Image，并使用生成的圖形對(duì)象在代碼中繪制矩形。這是jframe類(lèi)構(gòu)造函數(shù)的重要部分：super();        BufferedImage image=new BufferedImage(680,581,BufferedImage.TYPE_INT_ARGB);        m_graphicsObject =image.getGraphics();        JLabel label=new JLabel(new ImageIcon(image));        // buttons, mouse events and other controls use listeners to handle actions        // these listener are classes        btn1 = new JButton("Go!");        //btn1.setPreferredSize(new Dimension(100, 30));        btn1.addActionListener(new button_go_Click()); //listener 1        btn2 = new JButton("Clear!");        //btn2.setPreferredSize(new Dimension(100, 30));        btn2.addActionListener(new button_clear_Click()); //listener 2        //always add created buttons/controls to form        JPanel panel=new JPanel(new GridLayout(20,2));        panel.add(btn1);        panel.add(btn2);        Container pane = this.getContentPane();        pane.add(label);        pane.add(panel, BorderLayout.EAST);        this.setSize(680,581);        this.setVisible(true);