java 记事簿 关于 保存功能

String fileName="NoName.txt";

   else if(eventSource==saveItem){    fileName="NoName.txt";    writeFile(fileName);}   else if(eventSource==saveAsItem){    fileName=null;    writeFile(fileName);

public void writeFile(String name){        File filea ;        String messagef="文件未找到";        FileOutputStream outputfile=null;        if(fileName==null){            JFileChooser savefile=new JFileChooser();            savefile.setDialogTitle("保存文件");            savefile.setApproveButtonText("保存");            savefile.showSaveDialog(this);            filea=savefile.getSelectedFile();                    if(filea==null)return;        }        else {            filea=new File(fileName);        }        try{            outputfile=new FileOutputStream(filea);        }        catch(FileNotFoundException e){            JOptionPane.showMessageDialog(this, messagef, title, type);        }        String filecontent=textArea.getText();        String messaget="下文件错误";        try{            outputfile.write(filecontent.getBytes());        }        catch(IOException e){            JOptionPane.showMessageDialog(this, messaget, title, type);        }        String messagee="关闭流发生错误";        try{            outputfile.close();        }        catch(IOException e){            JOptionPane.showMessageDialog(this, messagee, title, type);        }    }    

String fileName=null;