import java.util.Hashtable;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.event.*;
import javax.swing.tree.*;

/**
 * @version 1.0 2002-07-07
 * @author Takashi KOBAYASHI
 */
public class memo09ex3 {
	public static void main( String[] args ) {
		Hashtable root = new Hashtable(), nodes1, nodes2;
		root.put( "SwingSwinging.com", ( nodes1 = new Hashtable() ) );
		nodes1.put( "Column", ( nodes2 = new Hashtable() ) );
		nodes2.put( "JavaMemo", "JavaMemo" );
		nodes2.put( "Diary", "Diary" );
		nodes1.put( "Desktop Java", ( nodes2 = new Hashtable() ) );
		nodes2.put( "Not Readme", "Not Readme" );

		final JTree tree = new JTree( root );

		tree.addTreeExpansionListener( new TreeExpansionListener(){
			public void treeExpanded( TreeExpansionEvent event ) {
				printExpandedNode();
			}
			public void treeCollapsed( TreeExpansionEvent event ) {
				printExpandedNode();
			}
			private void printExpandedNode() {
				System.out.println( "Print Expanded Node..." );
				TreePath path;
				for( int i = 0; i < tree.getRowCount(); i++ ) {
					path = tree.getPathForRow( i );
					if( tree.isExpanded( path ) )
						System.out.println( path.toString() );
				}
				System.out.println();
			}
		} );

		JFrame frame = new JFrame( "memo09ex3" );
		frame.getContentPane().add( tree );

		frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
		frame.pack();
		frame.setVisible( true );
	}
}