JList and ListModel have type parameters. Let's use 'em. (I'll fix the one

client that lives in the bowels of Yohoho.)

src/main/java/com/samskivert/swing/CollapsibleList.java

@@ -5,6 +5,7 @@
 
 package com.samskivert.swing;
 
+import java.util.List;
 import javax.swing.JLabel;
 import javax.swing.JList;
 import javax.swing.JPanel;
@@ -15,7 +16,7 @@ import javax.swing.ListModel;
  * can be collapsed. Each section of a list uses a {@link JList} instance
  * to render the section elements.
  */
-public class CollapsibleList extends JPanel
+public class CollapsibleList<E> extends JPanel
 {
     /**
      * Constructs an empty collapsible list.
@@ -31,15 +32,14 @@ public class CollapsibleList extends JPanel
     }
 
     /**
-     * Constructs a collapsible list with the supplied section labels and
-     * models.
+     * Constructs a collapsible list with the supplied section labels and models.
      */
-    public CollapsibleList (String[] sections, ListModel[] models)
+    public CollapsibleList (List<String> sections, List<ListModel<E>> models)
     {
         this(); // set up our layout manager
 
-        for (int i = 0; i < sections.length; i++) {
-            addSection(sections[i], models[i]);
+        for (int ii = 0, ll = sections.size(); ii < ll; ii++) {
+            addSection(sections.get(ii), models.get(ii));
         }
     }
 
@@ -59,10 +59,10 @@ public class CollapsibleList extends JPanel
      *
      * @return the index of the newly added section.
      */
-    public int addSection (String label, ListModel model)
+    public int addSection (String label, ListModel<E> model)
     {
         add(new JLabel(label));
-        add(new JList(model));
+        add(new JList<E>(model));
         return getSectionCount()-1;
     }
 
@@ -78,9 +78,10 @@ public class CollapsibleList extends JPanel
     /**
      * Returns the list object associated with the specified section.
      */
-    public JList getSectionList (int index)
+    public JList<E> getSectionList (int index)
     {
-        return (JList)getComponent(index*2+1);
+        @SuppressWarnings("unchecked") JList<E> list = (JList<E>)getComponent(index*2+1);
+        return list;
     }
 
     /**
@@ -88,7 +89,7 @@ public class CollapsibleList extends JPanel
      */
     public void toggleCollapsed (int index)
     {
-        JList list = getSectionList(index);
+        JList<E> list = getSectionList(index);
         list.setVisible(!list.isVisible());
     }
 }