JAVA 树 Rubicon

import   javax.swing.*;  
import   java.awt.*;  
import   java.awt.event.*;  
import   java.util.*; 
public class Temp {
 public Temp() {
  JFrame J = new JFrame("MENU");
  Container C = J.getContentPane();//要用J来获取，就像树一样
  String[] s1 = { "11", "22", "33" };
  String[] s2 = { "$$", "55", "99" };
  String[] s3 = { "55", "ii", "pp" };
  Hashtable H1 = new Hashtable();
  Hashtable H2 = new Hashtable();
  H1.put("Menu1", s1);
  H1.put("Menu2", s2);
  H2.put("Menu3-1", s3);
  H1.put("Menu3", H2);
  JTree tree = new JTree(H1);
  JScrollPane scrollpane = new JScrollPane();
  scrollpane.setViewportView(tree);//setVisible 为布尔值，在这不能用
  C.add(scrollpane);
  J.pack();
  J.setVisible(true);
  J.addWindowListener(new WindowAdapter() {
    public   void   windowClosing(WindowEvent e){  
                 System.exit(0);
   }
  });
 }
 public static void main(String args[]) {
  new Temp();
 }
}