求助大为大侠：

Question

init:
deps-jar:
Compiling 1 source file to F:\JavaProject\DrawPad\build\classes
F:\JavaProject\DrawPad\src\DrawPad\DrawPad.java:535: 无法访问的语句
    File fileName = fileChooser.getSelectedFile();
1 错误
生成失败（总时间：0 秒）
这个是什么问题啊 谢谢！！
附源码：public void saveFile()
{
   fileChooser=new JFileChooser();
   fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
   int result=fileChooser.showSaveDialog(this);
   if(result==JFileChooser.CANCEL_OPTION);
        return;
    File fileName = fileChooser.getSelectedFile();        fileName.canWrite();
        if(fileName==null||fileName.getName().equals(""))
             JOptionPane.showMessageDialog(fileChooser,"Invalid File Name",
                     "Invalid File Name",JOptionPane.ERROR_MESSAGE);
         else{
             try{
                 fileName.delete();
                 FileOutputStream fos=new FileOutputStream(fileName);
                 output=new ObjectOutputStream(fos);
                 drawings record;
                 output.writeInt(index);
                 
                 for(int i=0;i<index;i++)
                  {
                     drawings p=itemList[i];
                     output.writeObject(p);
                     output.flush();
                   }
                 output.close();
                 fos.close();
             }
             catch(IOException ioe)
             {
                ioe.printStackTrace();
                
             }
         }
   
}

Answer 1

 if(result==JFileChooser.CANCEL_OPTION);  //这里多了个分号，把他去掉
    return; 
 File   fileName   =   fileChooser.getSelectedFile();           
 fileName.canWrite(); 

Answer 2

程序执行到return之后就会向上一级返回,也就是说会返回到调用saveFile() 的那个方法去...这样看saveFile()方法中有永远也执行不到的语句...

Answer 3

老兄有几处错误哦,你用我的与你自己的比较一下吧:    public void saveFile()
    {
        fileChooser = new JFileChooser();
        fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
        int result = fileChooser.showSaveDialog(this);
        if (result == JFileChooser.CANCEL_OPTION) {
            return;
        }
        else {
            File fileName = fileChooser.getSelectedFile();
            fileName.canWrite();
            if (fileName == null || fileName.getName().equals("")) {
                JOptionPane.showMessageDialog(fileChooser, "Invalid   File   Name",
                                              "Invalid   File   Name", JOptionPane.ERROR_MESSAGE);
            }
            else {
                try {
                    fileName.delete();
                    FileOutputStream fos = new FileOutputStream(fileName);
                    output = new ObjectOutputStream(fos);
                    drawings record;
                    output.writeInt(index);                    for (int i = 0; i < index; i++) {
                        drawings p = itemList[i];
                        output.writeObject(p);
                        output.flush();
                    }
                    output.close();
                    fos.close();
                }
                catch (IOException ioe) {
                    ioe.printStackTrace();                }
            }
        }
    }
好好看看吧,你怎么if后面都不加这个呀{},写java代码的大忌哦!

Answer 4

    public void saveFile()
    {
        fileChooser = new JFileChooser();
        fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
        int result = fileChooser.showSaveDialog(this);
        if (result == JFileChooser.CANCEL_OPTION) {
            return;
        }
        else {
            File fileName = fileChooser.getSelectedFile();
            fileName.canWrite();
            if (fileName == null || fileName.getName().equals("")) {
                JOptionPane.showMessageDialog(fileChooser, "Invalid   File   Name",
                                              "Invalid   File   Name", JOptionPane.ERROR_MESSAGE);
            }
            else {
                try {
                    fileName.delete();
                    FileOutputStream fos = new FileOutputStream(fileName);
                    output = new ObjectOutputStream(fos);
                    drawings record;
                    output.writeInt(index);                    for (int i = 0; i < index; i++) {
                        drawings p = itemList[i];
                        output.writeObject(p);
                        output.flush();
                    }
                    output.close();
                    fos.close();
                }
                catch (IOException ioe) {
                    ioe.printStackTrace();                }
            }
        }
    }