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public class 练习 {  private JFrame frame;  /**   * Launch the application.   */  public static void main(String[] args) {   EventQueue.invokeLater(new Runnable() {    public void run() {     try {      练习 window = new 练习();      window.frame.setVisible(true);     } catch (Exception e) {      e.printStackTrace();     }    }   });  }  /**   * Create the application.   */  public 练习() {   initialize();  }  /**   * Initialize the contents of the frame.   */  private void

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