Problem with extending an extended class

Question

Hi JDC
I have to use a scrolled list several times among my program so I create a class named ScrolledList that extends Jpanel and an inner class that extends ScrolledLIst.
The problem shows up when I?m trying to add an item inside the inner class, the code pass compilation, it even enter the addItem() but its dont add item
public class ScrolledList extends JPanel{
  DefaultListModel dlm = new DefaultListModel();
  JList list = new JList();
  JScrollPane js = new JScrollPane(list);
  ScrolledList(){
    setLayout(new BorderLayout());
    add(js,BorderLayout.CENTER);
}here is the class i use whenever i need this scrolled list:
public class innerClass extends ScrolledList{
  public void addItem(String item){
    System.out.println("addItem invoked...");
    this.dlm.addElement(item);
  public static void main(String[] args) {
        JFrame frame = new JFrame("InnerClass");
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);}
        frame.getContentPane().add(new innerClass(),
                                   BorderLayout.CENTER);
        frame.setSize(400, 125);
        frame.setVisible(true);
        innerClass ic = new innerClass();
        ic.addItem("Shay");
}what im doing wrong(code example please)?
Thanks

Answer 1

Hi
i tried this , its still dont add item to the list:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ScrolledList extends JPanel{
  //List variables
  private DefaultListModel dlm = new DefaultListModel();
  private JList clientsList = new JList(dlm);;
  private JScrollPane clientScroll = new JScrollPane(clientsList);
  public final  boolean PRINTLN=true;
  public  void p(String out){
    if(PRINTLN)
      System.out.println(out);
  public ScrolledList() {
    try {
      jbInit();
    catch(Exception e) {
      e.printStackTrace();
  private void jbInit() throws Exception {
    this.setLayout(new BorderLayout());
    this.add(clientScroll);
   public void addClient(String client){
    p("addClient invoked....");
    dlm.addElement(client);
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new ScrolledList());
      frame.addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
          System.exit(0);
      frame.setSize(300,300);
      frame.setVisible(true);
      ScrolledList s  = new ScrolledList();
      s.addClient("Shay");
}thanks