How to get all JFrames in one window.

Question

I have a JFrame with menu system. When the user opens a file using the menus and filechoosers,another JFrame is called wherein the required output is displayed. If another file is chosen,the data of the previous file is not cleared from the runtime memory. What additional statement is needed to debug this program?
Also on clicking the second menu and the menuitems therein,each JFrame instance is created with the required outputs. How to make all these JFrame instances in a single window? I tried the JDesktopPane but with no success.

Answer 1

JFileChooser jfc = new JFileChooser();
JMenuBar jmb = new JMenuBar();
JMenu jm1 = new JMenu("File");
JMenu jm2 = new JMenu("Plot");
JMenuItem jmi1 = new JMenuItem("Open Alt+O",new ImageIcon("Open.gif"));
JMenuItem jmi2 = new JMenuItem("Exit");
JMenuItem jmi3 = new JMenuItem("Graph");
public void actionPerformed(ActionEvent ae){
     if (ae.getSource()==jmi1){
          int result = jfc.showOpenDialog(null);
          File file = jfc.getSelectedFile();
          String ftr = file.toString();
          System.out.println("The file selected is "+ftr);
          ftr.trim();
          if (result == JFileChooser.APPROVE_OPTION){
               try{
                    RandomAccessFile raf = new RandomAccessFile(ftr,"r");
                    long l = 0;
                    while (l < raf.length()){
                         String str = raf.readLine().toString();
                         l = raf.getFilePointer();
               jm2.setEnabled(true);
               frame("Frame");
               raf.close();
          }catch (Exception e){
               System.out.println("Exception caught is "+e.toString());
     }else if (result == JFileChooser.CANCEL_OPTION){
          jfc.cancelSelection();
     }else if (ae.getSource()== jmi2){
          System.exit(0);
     }else if (ae.getSource()== jmi3){
          graph("Graph");
static void frame(String title){
     JFrame frame = new JFrame(title);
     frame.getContentPane().add(new GraphPanel(), BorderLayout.CENTER);
     frame.setDefaultCloseOperation(2);
     frame.pack();
     frame.setVisible(true);
static void graph(String title){
     JFrame frame = new JFrame(title);
     frame.getContentPane().add(new Graph(), BorderLayout.CENTER);
     frame.setDefaultCloseOperation(2);
     frame.pack();
     frame.setVisible(true);
Whre should I use frame.setVisible(false); and frame.dispose();