import javax.imageio.*;
import java.awt.image.*;
import java.awt.event.*;
import java.awt.*;
import java.security.spec.*;
import java.security.*;
import java.lang.management.*;
import java.lang.ref.*;
import java.lang.reflect.*;
import java.net.*;
import java.io.*;
import javax.swing.table.*;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.*;
import java.util.concurrent.atomic.*;
import java.util.concurrent.*;
import java.util.regex.*;
import java.util.List;
import java.util.zip.*;
import java.util.*;


public class main {
  public static void main(String[] args) throws Exception {
    SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {

      List<JFrame> frames = listAllFrames();
      print(frames.size() + " frame(s) found.");
      
      List<JList> l = allSwingComponentsOfType(JList.class);
      print(l.size() + " list(s) found.");
      
      for (JList list : l) {
        if (!list.isShowing()) {
          print("Skipping list, not showing.");
          continue;
        }
        
        ListModel model = list.getModel();
        print("List entries: " + model.getSize());
        
        String myTag = "Kilroy was here! :)";
        
        if (!(model instanceof DefaultListModel)) {
          //print("Cannot modify, not a DefaultListModel (" + model.getClass().getName() + ")");
          convertToDefaultListModel(list);
          model = list.getModel();
        }
          
        if (model.getSize() != 0 && eq(myTag, model.getElementAt(model.getSize()-1)))
          print("Kilroy was here already :)");
        else {
          print("Trying to add a string (yes it may fail if it's not a string list) :)");
          
          DefaultListModel m = (DefaultListModel) ( model);
          m.addElement(myTag);
        }
      }
    } catch (Exception _e) {
  throw _e instanceof RuntimeException ? (RuntimeException) _e : new RuntimeException(_e); } }
});
  }

  static void convertToDefaultListModel(JList list) {
    ListModel model = list.getModel();
    DefaultListModel m = new DefaultListModel();
    for (int i = 0; i < model.getSize(); i++)
      m.addElement(model.getElementAt(i));
    list.setModel(m);
  }

  static <A> List<A> allSwingComponentsOfType(Class<A> theClass) {
    List<JFrame> frames = listAllFrames();
    List<A> l = new ArrayList<A>();
    
    for (JFrame f : frames)
      scanForComponents(f, theClass, l);
    return l;
  }

static int l(Object[] array) {
  return array == null ? 0 : array.length;
}

static int l(List list) {
  return list == null ? 0 : list.size();
}

static int l(String s) {
  return s == null ? 0 : s.length();
} 

static List<JFrame> listAllFrames() {
  List<JFrame> l = new ArrayList<JFrame>();
  for (Frame f : Frame.getFrames())
    if (f instanceof JFrame)
      l.add((JFrame) f);
  return l;
}

static boolean eq(Object a, Object b) {
  return a == null ? b == null : a.equals(b);
}

static void print() {
  System.out.println();
}

static void print(Object o) {
  System.out.println(o);
}

static void print(long i) {
  System.out.println(i);
}

static <A> void scanForComponents(Component c, Class<A> theClass, List<A> l) {
  if (theClass.isInstance(c))
    l.add((A) c);
  if (c instanceof Container)
  for (Component comp : ((Container) c).getComponents())
    scanForComponents(comp, theClass, l);
}
}