public class RandomAccessFileTest extends JFrame implements ActionListener{

    String dir;

    JTextArea textArea;

     public RandomAccessFileTest(){

        super("RandomAccessFileTest");

        addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){

        System.exit(0);

        }});

        textArea=new JTextArea();

        textArea.setEditable(false);

        JScrollPane scrollPane=new JScrollPane(textArea);

        this.getContentPane().add("Center",scrollPane);

        JPanel panel=new JPanel();

        panel.setLayout(new FlowLayout(FlowLayout.RIGHT,10,5));

        this.getContentPane().add(panel,"South");

        JButton open= new JButton("打开");

        JButton close= new JButton("关闭");

        open.addActionListener(this);

        open.setActionCommand("open");

        close.addActionListener(this);

        close.setActionCommand("close");

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