Sorting Nodes in JTree

Question

Can someone please help me. I got this class (MyTreeNode) from this forum but has problem compiling/using it due to my beginners status in Java. My current program is shown below. My problem is that if I change DefaultMutableTreeNode to MyTreeNode the program won't compile as the constructor for MyTreeNode does not take a parameter. Please show my how I can modify this to make use of the new class. I only want to sort the nodes in alphabetical order. If someone has a better way of doing it, please post it here.
public void xpy()
DefaultMutableTreeNode node1 = new DefaultMutableTreeNode(field1);
DefaultMutableTreeNode node2 = new DefaultMutableTreeNode(field2);
node1.add(node2);
class MyTreeNode extends DefaultMutableTreeNode
private static Comparator nodeComparator = new Comparator ()
public int compare(Object o1, Object o2)
return o1.toString().compareTo(o2.toString());
public boolean equals(Object obj)
return false; //static class -- 1 instance only
public void add(MutableTreeNode node)
super.add(node);
Collections.sort(this.children, nodeComparator); //this.children is a proteced variable reference to the node's vector of children.
Thanks
pslloo

Answer 1

Just add a constructor to your subclass:
class MyTreeNode extends DefaultMutableTreeNode {
  public MyTreeNode(Object obj) {
    super(obj);
...Regards