import javax.swing.*;
import java.awt.Dimension;
import java.awt.BorderLayout;
import java.util.Hashtable;

public class JTreeTest8 extends JFrame{

  public static void main(String[] args){
    JTreeTest8 frame = new JTreeTest8();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("ƒ^ƒCƒgƒ‹");
    frame.setVisible(true);
  }

  JTreeTest8(){
    Hashtable<String,String> swingdata = new Hashtable<String,String>();
    swingdata.put("JButton","JButton");
    swingdata.put("JLabel","JLabel");
    swingdata.put("JTextField","JTextField");

    Hashtable<String,Object> treedata = new Hashtable<String,Object>();
    treedata.put("Swing", swingdata);
    treedata.put("Java2D", "Java2D");
    treedata.put("Java3D", "Java3D");
    treedata.put("JavaMail", "JavaMail");
    JTree tree = new JTree(treedata);

    JScrollPane scrollPane = new JScrollPane();
    scrollPane.getViewport().setView(tree);
    scrollPane.setPreferredSize(new Dimension(180, 120));

    JPanel p = new JPanel();
    p.add(scrollPane);

    getContentPane().add(p, BorderLayout.CENTER);
  }