TreeCellRendererを試す -- JPanelをJTreeの中に埋め込む

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MyPanel.java
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import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.awt.geom.*;
import java.awt.image.*;

import javax.imageio.*;

import javax.swing.event.*;
import javax.swing.*;
import javax.swing.border.*;

import java.util.*;
import java.io.*;
import java.net.*;

/**
* $Id: TreeCellRenderer3.html,v 1.1 2009/06/22 16:12:01 kishi Exp kishi $
*/

public class MyPanel extends JPanel {

    private BufferedImage image = null;

    public MyPanel( String text, String imagePath ) {
        super();
        setPreferredSize( new Dimension( 500, 25 ) );

        setLayout( null );

        JLabel label = new JLabel( text );

        try {
            image = ImageIO.read( new File( imagePath ) );
        } catch ( Exception e ) {
            e.printStackTrace();
        }

        label.setBounds( 50, 0, 200, 25 );

        this.add( label );

        // ボーダーを追加
        setBorder( new MatteBorder( 1, 1, 1, 1, Color.black ) );

    }
    public void paintComponent( Graphics g ) {
        g.setColor( Color.cyan );
        g.fillRect( 0, 0, this.getWidth(), this.getHeight() );

        if ( image != null ) {
            g.drawImage( image, 0, 0, 25, 25, this );
        }

    }

}
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TCR.java
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import java.util.*;

import java.awt.*;
import java.awt.event.*;

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

/**
* $Id: TreeCellRenderer3.html,v 1.1 2009/06/22 16:12:01 kishi Exp kishi $
*/

public class TCR extends JFrame implements TreeCellRenderer {

    Map map;

    public Component getTreeCellRendererComponent(
        JTree tree , Object value , boolean selected ,
        boolean expanded , boolean leaf , int row , boolean hasFocus
    ) {

        // valueは実際のノードのオブジェクトを指す

        String text = value.toString();

        String gender = ( String ) map.get( value );
        String imagePath = null;

        if ( "MALE".equals( gender ) ) {
            imagePath = "male.gif";
        } else if ( "FEMALE".equals( gender ) ) {
            imagePath = "female.gif";
        } else {
            imagePath = "home.png";
        }

        MyPanel panel = new MyPanel( text, imagePath );

        return panel;
    }

    public TCR() {

        JPanel mainPanel = new JPanel();
        map = new HashMap();

        DefaultMutableTreeNode root = new DefaultMutableTreeNode( "メンバー" );
        DefaultTreeModel treeModel = new DefaultTreeModel( root );

        DefaultMutableTreeNode node1 = new DefaultMutableTreeNode( "山田太一" );
        map.put( node1, "MALE" );

        DefaultMutableTreeNode node2 = new DefaultMutableTreeNode( "大久保彦左衛門" );
        map.put( node2, "MALE" );

        DefaultMutableTreeNode node3 = new DefaultMutableTreeNode( "津島恵子" );
        map.put( node3, "FEMALE" );

        root.add( node1 );
        root.add( node2 );
        root.add( node3 );

        JTree tree = new JTree( treeModel );
        tree.setCellRenderer( this );

        // スクロールするペインを追加
        JScrollPane scrPane = new JScrollPane();
        scrPane.getViewport().setView( tree );
        scrPane.setPreferredSize( new Dimension( 360, 480 ) );

        mainPanel.add( scrPane );

        // コンテナに各パネルを配置
        Container container = this.getContentPane();
        container.add( mainPanel, BorderLayout.CENTER );

    }

    public static void main( String[] args ) {
        /* 自分自身を作成 */
        TCR viewer = new TCR();

        /* 終了処理を追加 */
        viewer.addWindowListener( new WindowAdapter() {
                                      public void windowClosing( WindowEvent e ) {
                                          System.exit( 0 );
                                      }
                                  }
                                );

        /* サイズと位置を指定 */
        viewer.setBounds( 10, 10, 400, 600 );

        /* 実際に表示する */
        viewer.setTitle( "TreeCellRendererを試す -- その３" );
        viewer.setVisible( true );
    }

}