Automatic Resizing Problems

Question

I am having serious troubles with my components resizing automatically when the window is resized or the contents within the component change. Namely, tree and list components. Every time I add an element to a tree or list component, the container that the tree or list is placed in resizes to match the longest element within the tree or list. I have researched my Pure JFC Swing book from cover to cover trying to find a fix for this, and have had no luck. Can somebody help me remedy this problem?

Answer 1

Ok, I haven't added anything to exit the system when you close the window. Also, I have chosen not to repeat any code for a JTree at all. It would take too long. This is code for a JList component. Try entering a really long e-mail and also a short one.
class NameFrame extends JFrame{
     Container contentPane = getContentPane();
     public NameFrame(String title, int w, int h){
          super(title);
          setSize(w,h);
          contentPane.add(new NamePanel());
class NamePanel extends JPanel implements ActionListener{
     JList list;
     JTextField email;
     JButton addButton;
     Container contentPane = getContentPane();
     Vector listData = new Vector();
     public NamePanel(){
          addButton = new JButton("Add");
          addButton.addActionListener(this);
          addButton.setActionCommand("Add");
          add(addButton);
          email = new JTextField("", 20);
          add(email);
          list = new JList();
          list.setVisibleRowCount(4);
          list.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
          list.setSelectionBackground(Color.blue);
          list.setSelectionForeground(Color.white);
          list.addListSelectionListener(this);
          JScrollPane sp = new JScrollPane(list, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
          add(sp);
     public void actionPerformed(ActionEvent ae){
          String but = ae.getActionCommand();
          if(but.equals("Add")){
               listData.addElement(email.getText());
               list.setListData(listData);
               email.setText("");
class A{
     public static void main(String[] args){
          NameFrame nf = new NameFrame();
          nf.show();
Then, click the window and watch it re-size to match the longest one. I don't like this, I would like to keep it the same size at all times no matter what size e-mail is entered.
Your dilligence is greatly appreciated....