simpletree.java

关于：Java2核心技术卷二 配套源码.

/**
 * @version 1.00 1999-07-17
 * @author Cay Horstmann
 */

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;

public class SimpleTree
{  public static void main(String[] args)
   {  JFrame frame = new SimpleTreeFrame();
      frame.show();
   }
}

class SimpleTreeFrame extends JFrame
{  public SimpleTreeFrame()
   {  setTitle("SimpleTree");
      setSize(300, 200);
      addWindowListener(new WindowAdapter()
         {  public void windowClosing(WindowEvent e)
            {  System.exit(0);
            }
         } );

      // set up tree model data

      DefaultMutableTreeNode root
         = new DefaultMutableTreeNode("World");
      DefaultMutableTreeNode country
         = new DefaultMutableTreeNode("USA");
      root.add(country);
      DefaultMutableTreeNode state
         = new DefaultMutableTreeNode("California");
      country.add(state);
      DefaultMutableTreeNode city
         = new DefaultMutableTreeNode("San Jose");
      state.add(city);
      city = new DefaultMutableTreeNode("Cupertino");
      state.add(city);
      state = new DefaultMutableTreeNode("Michigan");
      country.add(state);
      city = new DefaultMutableTreeNode("Ann Arbor");
      state.add(city);
      country = new DefaultMutableTreeNode("Germany");
      root.add(country);
      state = new DefaultMutableTreeNode("Schleswig-Holstein");
      country.add(state);
      city = new DefaultMutableTreeNode("Kiel");
      state.add(city);

      // construct tree and put it in a scroll pane

      JTree tree = new JTree(root);
      Container contentPane = getContentPane();
      contentPane.add(new JScrollPane(tree));
   }
}