scrollpanedemo3.java

java 完全探索的随书源码

// ScrollPaneDemo3.java

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

import java.awt.event.*;

class ScrollPaneDemo3 extends JFrame implements TreeSelectionListener
{
   ScrollPaneDemo3 (String title)
   {
      super (title);

      addWindowListener (new WindowAdapter ()
                         {
                             public void windowClosing (WindowEvent e)
                             {
                                System.exit (0);
                             }
                         });

      DefaultMutableTreeNode rootNode = createNodes ();
      JTree tree = new JTree (rootNode);
      tree.addTreeSelectionListener (this);
      tree.setRootVisible (true);

      JScrollPane jsp = new JScrollPane ();
      jsp.setViewportView (tree);
      getContentPane ().add (jsp);

      setSize (400, 300);
      setVisible (true);
   }

   DefaultMutableTreeNode createNodes ()
   {
      DefaultMutableTreeNode root;
      root = new DefaultMutableTreeNode ("Java");

      DefaultMutableTreeNode resources;
      resources = new DefaultMutableTreeNode ("Resources");

      DefaultMutableTreeNode books;
      books = new DefaultMutableTreeNode ("Books");

      books.add (new DefaultMutableTreeNode ("Java 2 By Example"));
      books.add (new DefaultMutableTreeNode ("Special Edition Using " +
                                             "Java 2 Platform " +
                                             "Standard Edition"));

      resources.add (books);

      DefaultMutableTreeNode magazines;
      magazines = new DefaultMutableTreeNode ("Magazines");

      magazines.add (new DefaultMutableTreeNode ("JavaWorld"));

      resources.add (magazines);

      DefaultMutableTreeNode webSites;
      webSites = new DefaultMutableTreeNode ("Web sites");

      webSites.add (new DefaultMutableTreeNode ("Gamelan"));
      webSites.add (new DefaultMutableTreeNode ("Javasoft"));

      resources.add (webSites);

      root.add (resources);

      DefaultMutableTreeNode tools;
      tools = new DefaultMutableTreeNode ("Tools");

      tools.add (new DefaultMutableTreeNode ("JDK"));
      tools.add (new DefaultMutableTreeNode ("Kawa"));
      tools.add (new DefaultMutableTreeNode ("Visual Age for Java"));

      root.add (tools);
   
      return root;
   }

   public void valueChanged (TreeSelectionEvent e)
   {
      TreePath path;
      path = (TreePath) e.getNewLeadSelectionPath ();

      System.out.println (path);
   }

   public static void main (String [] args)
   {
      new ScrollPaneDemo3 ("ScrollPane Demo3");
   }
}