treedemo.java

JAVA设计模式english

import java.awt.*;
import java.awt.event.*;
import java.util.*;

//swing classes
import com.sun.java.swing.text.*;
import com.sun.java.swing.*;
import com.sun.java.swing.event.*;
import com.sun.java.swing.border.*;
import com.sun.java.swing.tree.*;

public class TreeDemo extends JxFrame
{
   DefaultMutableTreeNode root;
   public TreeDemo()
   {
   super("Tree Demo");
   JPanel jp = new JPanel();   // create interior panel      
   jp.setLayout(new BorderLayout());
   getContentPane().add(jp);
   
   //create scroll pane
   JScrollPane sp =  new JScrollPane();
   jp.add("Center", sp);
   
   //create root node
   root = new DefaultMutableTreeNode("Foods");
   JTree tree = new JTree(root);    //create tree
   sp.getViewport().add(tree);      //add to scroller
   
   //create 3 nodes, each with three sub nodes
   addNodes("Meats", "Beef", "Chicken", "Pork");
   addNodes("Vegies", "Broccolli", "Carrots", "Peas");
   addNodes("Desserts","Charlotte Russe", "Bananas Flambe","Peach Melba"); 
   
   setSize(200, 300);
   setVisible(true);
   }
   //----------------------------------------
   private void addNodes(String b, String n1, String n2, String n3)
   {
      DefaultMutableTreeNode base = 
            new DefaultMutableTreeNode(b);
      root.add(base);
      base.add(new DefaultMutableTreeNode(n1));
      base.add(new DefaultMutableTreeNode(n2));
      base.add(new DefaultMutableTreeNode(n3));      
   }
   //----------------------------------------
   static public void main(String[] argv)
   {
      new TreeDemo();
   }
}