How can Display a specified sub set of a Jtree??

Question

Dear Friends: Good weekends:
I have following code:
import javax.swing.*;
import javax.swing.tree.*;
import apl.jhu.edu.JTree.ExitListener;
import apl.jhu.edu.JTree.WindowUtilities;
import java.awt.*;
     public class JTreeCars  extends JFrame {
       DefaultTreeModel treeModel;
       public JTreeCars() {
         super("Editable Tree Frame");
            JTreeSub js = new JTreeSub();
         setSize(200, 200);
         WindowUtilities.setNativeLookAndFeel();
         addWindowListener(new ExitListener());
         setDefaultCloseOperation(EXIT_ON_CLOSE);
       public class JTreeSub  extends JTree {
            public JTreeSub() {
            super();
            init();
       public void init(){
         DefaultMutableTreeNode Manufacturers = new DefaultMutableTreeNode("Car Makers");
         DefaultMutableTreeNode Cars = new DefaultMutableTreeNode("Cars");
         DefaultMutableTreeNode Nissan = new DefaultMutableTreeNode("Nissan");
         DefaultMutableTreeNode Nissan90 = new DefaultMutableTreeNode("Nissan90");
         DefaultMutableTreeNode Nissan91 = new DefaultMutableTreeNode("Nissan91");
         DefaultMutableTreeNode Nissan92 = new DefaultMutableTreeNode("Nissan92");
         DefaultMutableTreeNode Nissan95 = new DefaultMutableTreeNode("Nissan95");
         DefaultMutableTreeNode Nissan98 = new DefaultMutableTreeNode("Nissan98");
         DefaultMutableTreeNode Nissan2001 = new DefaultMutableTreeNode("Nissan2001");
         DefaultMutableTreeNode Nissan2002 = new DefaultMutableTreeNode("Nissan2002");
         DefaultMutableTreeNode Nissan2003 = new DefaultMutableTreeNode("Nissan2003");
         DefaultMutableTreeNode Nissan99 = new DefaultMutableTreeNode("Nissan99");
              Nissan.add(Nissan90);
              Nissan.add(Nissan91);
              Nissan.add(Nissan92);
              Nissan.add(Nissan95);
              Nissan.add(Nissan98);
              Nissan.add(Nissan99);
              Nissan.add(Nissan2001);
              Nissan.add(Nissan2002);
              Nissan.add(Nissan2003);
         DefaultMutableTreeNode Ford = new DefaultMutableTreeNode("Ford");
         DefaultMutableTreeNode Ford2001 = new DefaultMutableTreeNode("Ford2001");
         DefaultMutableTreeNode Ford2002 = new DefaultMutableTreeNode("Ford2002");
         DefaultMutableTreeNode Ford2003 = new DefaultMutableTreeNode("Ford2003");
         DefaultMutableTreeNode Ford2004 = new DefaultMutableTreeNode("Ford2004");
         DefaultMutableTreeNode Ford2005 = new DefaultMutableTreeNode("Ford2005");
              Ford.add(Ford2001);
              Ford.add(Ford2002);
              Ford.add(Ford2003);
              Ford.add(Ford2004);
              Ford.add(Ford2005);
         DefaultMutableTreeNode Benz = new DefaultMutableTreeNode("Benz");
         DefaultMutableTreeNode Benz81 = new DefaultMutableTreeNode("Benz81");
         DefaultMutableTreeNode Benz82 = new DefaultMutableTreeNode("Benz82");
         DefaultMutableTreeNode Benz83 = new DefaultMutableTreeNode("Benz83");
         DefaultMutableTreeNode Benz84 = new DefaultMutableTreeNode("Benz84");
         DefaultMutableTreeNode Benz85 = new DefaultMutableTreeNode("Benz85");
         DefaultMutableTreeNode Benz2001 = new DefaultMutableTreeNode("Benz2001");
         DefaultMutableTreeNode Benz2002 = new DefaultMutableTreeNode("Benz2002");
         DefaultMutableTreeNode Benz2003 = new DefaultMutableTreeNode("Benz2003");
              Benz.add(Benz81);
              Benz.add(Benz82);
              Benz.add(Benz83);
              Benz.add(Benz84);
              Benz.add(Benz85);
              Benz.add(Benz2001);
              Benz.add(Benz2002);
              Benz.add(Benz2003);
         DefaultMutableTreeNode Toyota = new DefaultMutableTreeNode("Toyota");
         DefaultMutableTreeNode Cherry = new DefaultMutableTreeNode("Cherry");
         treeModel = new DefaultTreeModel(Manufacturers);
         JTree tree = new JTree(treeModel);
         tree.setEditable(true);
         treeModel.insertNodeInto(Cars,Manufacturers, 0);
         Cars.add(Nissan);
         Cars.add(Ford);
         Cars.add(Benz);
         Cars.add(Toyota);
         Cars.add(Cherry);
         getContentPane().add(tree, BorderLayout.CENTER);
       public static void main(String args[]) {
            JTreeCars st = new JTreeCars();
            st.setVisible(true);
     }I only hope to display subset of this whole JTree, ie, the Nodes with 2001, 2002, 2003 will be displayed, all others will be hidden, not to display
Here I hope only the node contains "2001" , "2002", "2003" will be displayed. all others will not be displayed.
Please advice how to do it??
Thanks a nd have a good weekends.
sunny

Answer 1

Thanks Michael,
I just post my updated code, I hope if I uncheck the box, all tree will be displayed, if I check it, Only 2001,2002, 2003 cars show up, looks like my code not work, what is wrong here??
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeNode;
class FilterTreeModel extends DefaultTreeModel {
       Filter filter;
       String sText;
       public FilterTreeModel(TreeNode root, Filter filter) {
         super(root);
         this.filter =filter;
       public void setFiltered(boolean pass, String sstr) {
         filter.setFiltered(pass,sstr );
         sText=sstr;
         Object[] path = {root};
         int[] childIndices  = new int[root.getChildCount()];     
         Object[] children  = new Object[root.getChildCount()];
         for (int i = 0; i < root.getChildCount(); i++) {
           childIndices[i] = i;
           children[i] = root.getChildAt(i);
         fireTreeStructureChanged(this,path,childIndices, children);
       public int getChildCount(Object parent) {
         int realCount = super.getChildCount(parent), filterCount=0;
         for (int i=0; i<realCount; i++) {
           DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode)super.getChild(parent,i);
           if (filter.pass(dmtn, sText)) filterCount++;
         return filterCount;
       public Object getChild(Object parent, int index) {
         int cnt=-1;
         for (int i=0; i<super.getChildCount(parent); i++) {
           Object child = super.getChild(parent,i);
           if (filter.pass(child,sText)) cnt++;
           if (cnt==index) return child;
         return null;
     interface Filter {
       public boolean pass(Object obj, String stt);
       public void setFiltered(boolean pass, String str);
       public boolean isFiltered();
     class MyFilter implements Filter {
       boolean pass=true;
       String  strFilter;
       public boolean pass(Object obj, String sttr) {
         if (pass) return true;
         //char c = obj.toString().charAt(0);
         String c = obj.toString();
        // return Character.toLowerCase(c)<0;
         return c.contains(sttr);
       public void setFiltered(boolean pass, String str) {
            this.pass=pass;
            strFilter= str;
       public boolean isFiltered() {
            return pass;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
public class JTreeCarDemo extends JFrame {
  JTreeSub jt = new JTreeSub();
  MyFilter mf = new MyFilter();
  JCheckBox jcb = new JCheckBox("Filter");
  FilterTreeModel ftm = new FilterTreeModel((TreeNode)jt.getModel().getRoot(), mf);
  DefaultTreeModel treeModel;
  public JTreeCarDemo() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = getContentPane();
    jt.setModel(ftm);
    content.add(new JScrollPane(jt), BorderLayout.CENTER);
    content.add(jcb, BorderLayout.SOUTH);
    jcb.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        ftm.setFiltered(!jcb.isSelected(), "200");
    setSize(500, 700);
    setVisible(true);
    setTitle("New Car from 2000");
  public static void main(String[] args) {
       new JTreeCarDemo();
  public class JTreeSub  extends JTree {
       public JTreeSub() {
       super();
         DefaultMutableTreeNode Manufacturers = new DefaultMutableTreeNode("Car Makers");
         DefaultMutableTreeNode Cars = new DefaultMutableTreeNode("Cars");
         DefaultMutableTreeNode Nissan = new DefaultMutableTreeNode("Nissan");
         DefaultMutableTreeNode Nissan90 = new DefaultMutableTreeNode("Nissan90");
         DefaultMutableTreeNode Nissan91 = new DefaultMutableTreeNode("Nissan91");
         DefaultMutableTreeNode Nissan92 = new DefaultMutableTreeNode("Nissan92");
         DefaultMutableTreeNode Nissan95 = new DefaultMutableTreeNode("Nissan95");
         DefaultMutableTreeNode Nissan98 = new DefaultMutableTreeNode("Nissan98");
         DefaultMutableTreeNode Nissan2001 = new DefaultMutableTreeNode("Nissan2001");
         DefaultMutableTreeNode Nissan2002 = new DefaultMutableTreeNode("Nissan2002");
         DefaultMutableTreeNode Nissan2003 = new DefaultMutableTreeNode("Nissan2003");
         DefaultMutableTreeNode Nissan99 = new DefaultMutableTreeNode("Nissan99");
         Nissan.add(Nissan90);
         Nissan.add(Nissan91);
         Nissan.add(Nissan92);
         Nissan.add(Nissan95);
         Nissan.add(Nissan98);
         Nissan.add(Nissan99);
         Nissan.add(Nissan2001);
         Nissan.add(Nissan2002);
         Nissan.add(Nissan2003);
    DefaultMutableTreeNode Ford = new DefaultMutableTreeNode("Ford");
    DefaultMutableTreeNode Ford2001 = new DefaultMutableTreeNode("Ford2001");
    DefaultMutableTreeNode Ford2002 = new DefaultMutableTreeNode("Ford2002");
    DefaultMutableTreeNode Ford2003 = new DefaultMutableTreeNode("Ford2003");
    DefaultMutableTreeNode Ford2004 = new DefaultMutableTreeNode("Ford2004");
    DefaultMutableTreeNode Ford2005 = new DefaultMutableTreeNode("Ford2005");
         Ford.add(Ford2001);
         Ford.add(Ford2002);
         Ford.add(Ford2003);
         Ford.add(Ford2004);
         Ford.add(Ford2005);
    DefaultMutableTreeNode Benz = new DefaultMutableTreeNode("Benz");
    DefaultMutableTreeNode Benz81 = new DefaultMutableTreeNode("Benz81");
    DefaultMutableTreeNode Benz82 = new DefaultMutableTreeNode("Benz82");
    DefaultMutableTreeNode Benz83 = new DefaultMutableTreeNode("Benz83");
    DefaultMutableTreeNode Benz84 = new DefaultMutableTreeNode("Benz84");
    DefaultMutableTreeNode Benz85 = new DefaultMutableTreeNode("Benz85");
    DefaultMutableTreeNode Benz2001 = new DefaultMutableTreeNode("Benz2001");
    DefaultMutableTreeNode Benz2002 = new DefaultMutableTreeNode("Benz2002");
    DefaultMutableTreeNode Benz2003 = new DefaultMutableTreeNode("Benz2003");
         Benz.add(Benz81);
         Benz.add(Benz82);
         Benz.add(Benz83);
         Benz.add(Benz84);
         Benz.add(Benz85);
         Benz.add(Benz2001);
         Benz.add(Benz2002);
         Benz.add(Benz2003);
    DefaultMutableTreeNode Toyota = new DefaultMutableTreeNode("Toyota");
    DefaultMutableTreeNode Cherry = new DefaultMutableTreeNode("Cherry");
    treeModel = new DefaultTreeModel(Manufacturers);
    JTree tree = new JTree(treeModel);
    tree.setEditable(true);
    //treeModel.insertNodeInto(Cars,Manufacturers, 0);
    Manufacturers.add(Cars);
    Cars.add(Nissan);
    Cars.add(Ford);
    Cars.add(Benz);
    Cars.add(Toyota);
    Cars.add(Cherry);
    getContentPane().add(tree, BorderLayout.CENTER);
}