诚心请教java学习中遇到的问题，望高手指点迷津！

Question

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingConstants;
public class JNotePadUI extends JFrame { private JMenu editMenu;
private JPopupMenu popUpMenu;
private JMenuItem menuOpen;
private JMenuItem menuSave;
private JMenuItem menuClose;
private JMenuItem menuSaveAs;
private JMenuItem menuCut;
private JMenuItem menuCopy;
private JMenuItem menuPaste;
private JMenuItem menuAbout;
private JTextArea textArea;
public JNotePadUI (){
super("新建文本文件");
setUpUIComponent();
setUpEventListener();
setVisible(true);

}


private void setUpUIComponent() {
// TODO Auto-generated method stub

setSize(640,480);
//菜单栏
JMenuBar menuBar = new JMenuBar() ;
//设置“文件”菜单
JMenu fileMenu = new JMenu("文件");
JMenuItem menuOpen = new JMenuItem("打开");

//快捷键设置
menuOpen.setAccelerator(
KeyStroke.getKeyStroke(
KeyEvent.VK_O,
InputEvent.CTRL_MASK));
JMenuItem menuSave =new JMenuItem ("保存");
menuSave.setAccelerator(
KeyStroke.getKeyStroke(
KeyEvent.VK_S,
InputEvent.CTRL_MASK));
JMenuItem menuSaveAs =new JMenuItem ("另存为");
JMenuItem menuClose =new JMenuItem ("关闭");
menuClose.setAccelerator(
KeyStroke.getKeyStroke(
KeyEvent.VK_Q,
InputEvent.CTRL_MASK));


fileMenu.add(menuOpen);
fileMenu.addSeparator();  //分割线
fileMenu.add(menuSave);
fileMenu.add(menuSaveAs);
fileMenu.addSeparator(); //分割线
fileMenu.add(menuClose);

//设置编辑菜单
JMenu editMenu = new JMenu("编辑");
JMenuItem menuCut = new JMenuItem("剪切");
menuCut.setAccelerator(
KeyStroke.getKeyStroke(
KeyEvent.VK_X,
InputEvent.CTRL_MASK));
JMenuItem menuCopy = new JMenuItem("复制");
menuCut.setAccelerator(
KeyStroke.getKeyStroke(
KeyEvent.VK_C,
InputEvent.CTRL_MASK));
JMenuItem menuPaste = new JMenuItem("粘贴");
menuPaste.setAccelerator(
KeyStroke.getKeyStroke(
KeyEvent.VK_V,
InputEvent.CTRL_MASK));
editMenu.add(menuCut);
editMenu.add(menuCopy);
editMenu.add(menuPaste);

//设置关于菜单
JMenu aboutMenu = new JMenu("关于");
JMenuItem menuAbout = new JMenuItem ("关于JNotePad");
aboutMenu.add(menuAbout);

menuBar.add(fileMenu);
menuBar.add(editMenu);
menuBar.add(aboutMenu);
setJMenuBar(menuBar);
//文字编辑区域
JTextArea textArea =new JTextArea();
textArea.setFont(new Font ("宋体",Font.PLAIN,16));
textArea.setLineWrap(true);
JScrollPane panel = new JScrollPane(
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER
);
Container contentPane = getContentPane ();
contentPane.add(panel,BorderLayout.CENTER);


//状态栏
JLabel stateBar = new JLabel("未修改");
stateBar.setHorizontalAlignment(SwingConstants.LEFT);
stateBar.setBorder(
BorderFactory.createEtchedBorder());
contentPane.add(stateBar,BorderLayout.SOUTH);

popUpMenu =editMenu.getPopupMenu();
 
} private void setUpEventListener() {
// 单击窗口关闭按钮事件处理

addWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent e){
closeFile();
}
}
);
//菜单-打开
menuOpen.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
openFile();
}

}
);
//菜单-保存
menuSave.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
saveFile();
}

}
);

//菜单-另存为
menuSaveAs.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
saveFileAs();
}

}
);
//菜单-关闭文件
menuClose.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
closeFile();
}

}
);
//菜单-剪切
menuCut.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
cut();
}

}
);
//菜单-复制
menuCopy.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
copy();
}

}
);
//菜单-粘贴
menuPaste.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
paste();
}

}
);
//菜单-关于
menuAbout.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
//显示对话框
JOptionPane.showOptionDialog(null,
"程序名称:\n JNotePad \n" +
"程序设计：\n WCS\n " +
"简介：\n" +
"  实验对象" +
"欢迎下载" +
"http://www.swt-designer.com" ,
"关于JNotePad",
JOptionPane.DEFAULT_OPTION,
JOptionPane.INFORMATION_MESSAGE,
null,null,null

);
}

}
);
//编辑键盘事件
textArea.addKeyListener(
new KeyAdapter(){
public void keyTyped(KeyEvent e){
processTextArea();
}
}
);
//编辑鼠标事件
textArea.addMouseListener(
new MouseAdapter(){
public void mouseReleased(MouseEvent e){
if(e.getButton()== MouseEvent.BUTTON3)
popUpMenu.show(editMenu,e.getX(),e.getY());
}
public void mouseClicked(MouseEvent e){
if(e.getButton()== MouseEvent.BUTTON1)
popUpMenu.setVisible(false);
}
}
);

}
protected void processTextArea() {
// TODO Auto-generated method stub

}
protected void paste() {
// TODO Auto-generated method stub

}
protected void copy() {
// TODO Auto-generated method stub

}
protected void cut() {
// TODO Auto-generated method stub

}
protected void saveFileAs() {
// TODO Auto-generated method stub

}
protected void saveFile() {
// TODO Auto-generated method stub

}
protected void openFile() {
// TODO Auto-generated method stub

}
protected void closeFile() {
// TODO Auto-generated method stub

}  
public static void main(String[] args) {
// TODO Auto-generated method stub
new JNotePadUI ();
}}运行后提示：
Exception in thread "main" java.lang.NullPointerException
at JNotePadUI.setUpEventListener(JNotePadUI.java:157)
at JNotePadUI.<init>(JNotePadUI.java:50)
at JNotePadUI.main(JNotePadUI.java:299)
我是照着书上打的源码 请问是什么问题不能正常运行啊，希望高手指点迷津！

Answer 1

 private JMenu editMenu;
    private JPopupMenu popUpMenu;
    private JMenuItem menuOpen;
    private JMenuItem menuSave;
    private JMenuItem menuClose;
    private JMenuItem menuSaveAs;
    private JMenuItem menuCut;
    private JMenuItem menuCopy;
    private JMenuItem menuPaste;
    private JMenuItem menuAbout;
    private JTextArea textArea;    查看一下 是否这些个东西在后面用之前都 NEW 了       建议下次贴代码的时候把行号一起贴出来
     
    at JNotePadUI.setUpEventListener(JNotePadUI.java:157) 这行空指针异常了

Answer 2

 menuOpen.addActionListener(
 menuSave.addActionListener(
…………
关键在这几行，你的menuOpen,menuSave等等都没有初始化，当然是报空指针异常了。我想你的原意是在这
  private void setUpUIComponent() {
        ……
        JMenuItem menuOpen = new JMenuItem("打开");初始化，但很遗憾，你这样做只能是又new了一个JMenuItem，而不是将成员变量中的menuOpen初始化
解决办法：将 JMenuItem menuOpen = new JMenuItem("打开");
改成          this.menuOpen = new JMenuItem("打开");

Answer 3

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingConstants;
public class Test13 extends JFrame {    private JMenu editMenu;
    private JPopupMenu popUpMenu;
    private JMenuItem menuOpen;
    private JMenuItem menuSave;
    private JMenuItem menuClose;
    private JMenuItem menuSaveAs;
    private JMenuItem menuCut;
    private JMenuItem menuCopy;
    private JMenuItem menuPaste;
    private JMenuItem menuAbout;
    private JTextArea textArea;
    public Test13 (){
        super("新建文本文件");
        setUpUIComponent();
        
        setVisible(true);
        
    }
    
    
    private void setUpUIComponent() {
        // TODO Auto-generated method stub
        
        setSize(640,480);
        //菜单栏
        JMenuBar menuBar = new JMenuBar() ;
        //设置“文件”菜单
        JMenu fileMenu = new JMenu("文件");
        JMenuItem menuOpen = new JMenuItem("打开");
        
        //快捷键设置
        menuOpen.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_O,
                        InputEvent.CTRL_MASK));
        JMenuItem menuSave =new JMenuItem ("保存");
        menuSave.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_S,
                        InputEvent.CTRL_MASK));
        JMenuItem menuSaveAs =new JMenuItem ("另存为");
        JMenuItem menuClose =new JMenuItem ("关闭");
        menuClose.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_Q,
                        InputEvent.CTRL_MASK));
        
        
        fileMenu.add(menuOpen);
        fileMenu.addSeparator();  //分割线
        fileMenu.add(menuSave);
        fileMenu.add(menuSaveAs);
        fileMenu.addSeparator(); //分割线
        fileMenu.add(menuClose);
        
        //设置编辑菜单
        final JMenu editMenu = new JMenu("编辑");
        JMenuItem menuCut = new JMenuItem("剪切");
        menuCut.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_X,
                        InputEvent.CTRL_MASK));
        JMenuItem menuCopy = new JMenuItem("复制");
        menuCut.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_C,
                        InputEvent.CTRL_MASK));
        JMenuItem menuPaste = new JMenuItem("粘贴");
        menuPaste.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_V,
                        InputEvent.CTRL_MASK));
        editMenu.add(menuCut);
        editMenu.add(menuCopy);
        editMenu.add(menuPaste);
        
        //设置关于菜单
        JMenu aboutMenu = new JMenu("关于");
        JMenuItem menuAbout = new JMenuItem ("关于JNotePad");
        aboutMenu.add(menuAbout);
        
        menuBar.add(fileMenu);
        menuBar.add(editMenu);
        menuBar.add(aboutMenu);
        setJMenuBar(menuBar);
        //文字编辑区域
        JTextArea textArea =new JTextArea();
        textArea.setFont(new Font ("宋体",Font.PLAIN,16));
        textArea.setLineWrap(true);
        JScrollPane panel = new JScrollPane(
                ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
                ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER
        );
        Container contentPane = getContentPane ();
        contentPane.add(panel,BorderLayout.CENTER);
        
        
        //状态栏
        JLabel stateBar = new JLabel("未修改");
        stateBar.setHorizontalAlignment(SwingConstants.LEFT);
        stateBar.setBorder(
                BorderFactory.createEtchedBorder());
        contentPane.add(stateBar,BorderLayout.SOUTH);
                
        popUpMenu =editMenu.getPopupMenu();
//        setUpEventListener();
//      菜单-打开
        menuOpen.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        openFile();
                    }
                    
                }
        );
        //菜单-保存
        menuSave.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        saveFile();
                    }
                    
                }
        );
        
        //菜单-另存为
        menuSaveAs.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        saveFileAs();
                    }
                    
                }
        );
        //菜单-关闭文件
        menuClose.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        closeFile();
                    }
                    
                }
        );
        //菜单-剪切
        menuCut.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        cut();
                    }
                    
                }
        );
        //菜单-复制
        menuCopy.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        copy();
                    }
                    
                }
        );
        //菜单-粘贴
        menuPaste.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        paste();
                    }
                    
                }
        );
        //菜单-关于
        menuAbout.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        //显示对话框
                        JOptionPane.showOptionDialog(null,
                                "程序名称:\n JNotePad \n" +
                                "程序设计：\n WCS\n " +
                                "简介：\n" +
                                "  实验对象" +
                                "欢迎下载" +
                                "http://www.swt-designer.com" ,
                                "关于JNotePad",
                                JOptionPane.DEFAULT_OPTION,
                                JOptionPane.INFORMATION_MESSAGE,
                                null,null,null
                            
                        );                        
                    }
                    
                }
        );
        //编辑键盘事件
        textArea.addKeyListener(
                new KeyAdapter(){
                    public void keyTyped(KeyEvent e){
                        processTextArea();
                    }
                }
        );
        //编辑鼠标事件
        textArea.addMouseListener(
            new MouseAdapter(){
                public void mouseReleased(MouseEvent e){
                        if(e.getButton()== MouseEvent.BUTTON3)
                            popUpMenu.show(editMenu,e.getX(),e.getY());
                }
                public void mouseClicked(MouseEvent e){
                    if(e.getButton()== MouseEvent.BUTTON1)
                        popUpMenu.setVisible(false);
                }
            }
        );
        
         
    }    private void setUpEventListener() {
        // 单击窗口关闭按钮事件处理
        
        addWindowListener(
                new WindowAdapter(){
                    public void windowClosing(WindowEvent e){
                        closeFile();
                    }
                }
        );
        
        
    }
    protected void processTextArea() {
        // TODO Auto-generated method stub
        
    }
    protected void paste() {
        // TODO Auto-generated method stub
        
    }
    protected void copy() {
        // TODO Auto-generated method stub
        
    }
    protected void cut() {
        // TODO Auto-generated method stub
        
    }
    protected void saveFileAs() {
        // TODO Auto-generated method stub
        
    }
    protected void saveFile() {
        // TODO Auto-generated method stub
        
    }
    protected void openFile() {
        // TODO Auto-generated method stub
        
    }
    protected void closeFile() {
        // TODO Auto-generated method stub
        
    }  
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new Test13 ();
    }}

Answer 4

正解：import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingConstants;
public class Test13 extends JFrame {    private JMenu editMenu;
    private JPopupMenu popUpMenu;
    private JMenuItem menuOpen;
    private JMenuItem menuSave;
    private JMenuItem menuClose;
    private JMenuItem menuSaveAs;
    private JMenuItem menuCut;
    private JMenuItem menuCopy;
    private JMenuItem menuPaste;
    private JMenuItem menuAbout;
    private JTextArea textArea;
    public Test13 (){
        super("新建文本文件");
        setUpUIComponent();
        setUpEventListener();
        setVisible(true);
        
    }
    
    
    private void setUpUIComponent() {
        // TODO Auto-generated method stub
        
        setSize(640,480);
        //菜单栏
        JMenuBar menuBar = new JMenuBar() ;
        //设置“文件”菜单
        JMenu fileMenu = new JMenu("文件");
        this.menuOpen = new JMenuItem("打开");
        
        //快捷键设置
        menuOpen.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_O,
                        InputEvent.CTRL_MASK));
        this.menuSave =new JMenuItem ("保存");
        menuSave.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_S,
                        InputEvent.CTRL_MASK));
        this.menuSaveAs =new JMenuItem ("另存为");
        this.menuClose =new JMenuItem ("关闭");
        menuClose.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_Q,
                        InputEvent.CTRL_MASK));
        
        
        fileMenu.add(menuOpen);
        fileMenu.addSeparator();  //分割线
        fileMenu.add(menuSave);
        fileMenu.add(menuSaveAs);
        fileMenu.addSeparator(); //分割线
        fileMenu.add(menuClose);
        
        //设置编辑菜单
        JMenu editMenu = new JMenu("编辑");
        this.menuCut = new JMenuItem("剪切");
        menuCut.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_X,
                        InputEvent.CTRL_MASK));
        this.menuCopy = new JMenuItem("复制");
        menuCut.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_C,
                        InputEvent.CTRL_MASK));
        this.menuPaste = new JMenuItem("粘贴");
        menuPaste.setAccelerator(
                KeyStroke.getKeyStroke(
                        KeyEvent.VK_V,
                        InputEvent.CTRL_MASK));
        editMenu.add(menuCut);
        editMenu.add(menuCopy);
        editMenu.add(menuPaste);
        
        //设置关于菜单
        JMenu aboutMenu = new JMenu("关于");
        this.menuAbout = new JMenuItem ("关于JNotePad");
        aboutMenu.add(menuAbout);
        
        menuBar.add(fileMenu);
        menuBar.add(editMenu);
        menuBar.add(aboutMenu);
        setJMenuBar(menuBar);
        //文字编辑区域
        this.textArea =new JTextArea();
        textArea.setFont(new Font ("宋体",Font.PLAIN,16));
        textArea.setLineWrap(true);
        JScrollPane panel = new JScrollPane(
                ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
                ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER
        );
        Container contentPane = getContentPane ();
        contentPane.add(panel,BorderLayout.CENTER);
        
        
        //状态栏
        JLabel stateBar = new JLabel("未修改");
        stateBar.setHorizontalAlignment(SwingConstants.LEFT);
        stateBar.setBorder(
                BorderFactory.createEtchedBorder());
        contentPane.add(stateBar,BorderLayout.SOUTH);
                
        popUpMenu =editMenu.getPopupMenu();
         
    }    private void setUpEventListener() {
        // 单击窗口关闭按钮事件处理
        
        addWindowListener(
                new WindowAdapter(){
                    public void windowClosing(WindowEvent e){
                        closeFile();
                    }
                }
        );
        //菜单-打开
        menuOpen.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        openFile();
                    }
                    
                }
        );
        //菜单-保存
        menuSave.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        saveFile();
                    }
                    
                }
        );
        
        //菜单-另存为
        menuSaveAs.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        saveFileAs();
                    }
                    
                }
        );
        //菜单-关闭文件
        menuClose.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        closeFile();
                    }
                    
                }
        );
        //菜单-剪切
        menuCut.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        cut();
                    }
                    
                }
        );
        //菜单-复制
        menuCopy.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        copy();
                    }
                    
                }
        );
        //菜单-粘贴
        menuPaste.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        paste();
                    }
                    
                }
        );
        //菜单-关于
        menuAbout.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent e){
                        //显示对话框
                        JOptionPane.showOptionDialog(null,
                                "程序名称:\n JNotePad \n" +
                                "程序设计：\n WCS\n " +
                                "简介：\n" +
                                "  实验对象" +
                                "欢迎下载" +
                                "http://www.swt-designer.com" ,
                                "关于JNotePad",
                                JOptionPane.DEFAULT_OPTION,
                                JOptionPane.INFORMATION_MESSAGE,
                                null,null,null
                            
                        );                        
                    }
                    
                }
        );
        //编辑键盘事件
        textArea.addKeyListener(
                new KeyAdapter(){
                    public void keyTyped(KeyEvent e){
                        processTextArea();
                    }
                }
        );
        //编辑鼠标事件
        textArea.addMouseListener(
            new MouseAdapter(){
                public void mouseReleased(MouseEvent e){
                        if(e.getButton()== MouseEvent.BUTTON3)
                            popUpMenu.show(editMenu,e.getX(),e.getY());
                }
                public void mouseClicked(MouseEvent e){
                    if(e.getButton()== MouseEvent.BUTTON1)
                        popUpMenu.setVisible(false);
                }
            }
        );
        
    }
    protected void processTextArea() {
        // TODO Auto-generated method stub
        
    }
    protected void paste() {
        // TODO Auto-generated method stub
        
    }
    protected void copy() {
        // TODO Auto-generated method stub
        
    }
    protected void cut() {
        // TODO Auto-generated method stub
        
    }
    protected void saveFileAs() {
        // TODO Auto-generated method stub
        
    }
    protected void saveFile() {
        // TODO Auto-generated method stub
        
    }
    protected void openFile() {
        // TODO Auto-generated method stub
        
    }
    protected void closeFile() {
        // TODO Auto-generated method stub
        
    }  
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new Test13 ();
    }}