List顯示checkBox

// File:CheckListExample.java
/* (swing1.1.1beta2) */
//package jp.gr.java_conf.tame.swing.examples;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.plaf.metal.*;

import jp.gr.java_conf.tame.swing.tree.*;

/**
 * @version 1.0 04/24/99
 */
public class CheckListExample extends JFrame {
  
  public CheckListExample() {
    super("CheckList Example");
    String[] strs = {"swing", "home", "basic", "metal", "JList"};    
                                            
    final JList list = new JList( createData(strs) );
    
    // set "home" icon
    Icon icon = MetalIconFactory.getFileChooserHomeFolderIcon();
    ((CheckableItem)list.getModel().getElementAt(1)).setIcon(icon);
    
    list.setCellRenderer(new CheckListRenderer());
    list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    list.setBorder(new EmptyBorder(0,4,0,0));
    list.addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        int index = list.locationToIndex(e.getPoint());
        CheckableItem item = (CheckableItem)list.getModel().getElementAt(index);
        item.setSelected(! item.isSelected());
        Rectangle rect = list.getCellBounds(index, index);
        list.repaint(rect);
      }
    });   
    JScrollPane sp = new JScrollPane(list);  
     
    final JTextArea textArea = new JTextArea(3,10);
    JScrollPane textPanel = new JScrollPane(textArea);
    JButton printButton = new JButton("print");
    printButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        ListModel model = list.getModel();
        int n = model.getSize();
        for (int i=0;i<n;i++) {
          CheckableItem item = (CheckableItem)model.getElementAt(i);
          if (item.isSelected()) {
            textArea.append(item.toString());
            textArea.append(System.getProperty("line.separator"));
          }
        }
      }
    });
    JButton clearButton = new JButton("clear");
    clearButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textArea.setText("");
      }
    });
    JPanel panel = new JPanel(new GridLayout(2,1));
    panel.add(printButton);
    panel.add(clearButton);
    
    getContentPane().add(sp,    BorderLayout.CENTER);
    getContentPane().add(panel, BorderLayout.EAST);
    getContentPane().add(textPanel, BorderLayout.SOUTH);
  }
  
  private CheckableItem[] createData(String[] strs) {
    int n = strs.length;
    CheckableItem[] items = new CheckableItem[n];
    for (int i=0;i<n;i++) {
      items[i] = new CheckableItem(strs[i]);
    }
    return items;
  }
  
  class CheckableItem {
    private String  str;
    private boolean isSelected;
    private Icon icon;
    
    public CheckableItem(String str) {
      this.str = str;
      isSelected = false;
    }
    
    public void setSelected(boolean b) {
      isSelected = b;
    }
    
    public boolean isSelected() {
      return isSelected;
    }
    
    public String toString() {
      return str;
    }
    
    public void setIcon(Icon icon) {
      this.icon = icon;
    }
    
    public Icon getIcon() {
      return icon;
    }
  }
  
  class CheckListRenderer extends CheckRenderer implements ListCellRenderer {
    Icon commonIcon;
    
    public CheckListRenderer() {
      check.setBackground(UIManager.getColor("List.textBackground"));
      label.setForeground(UIManager.getColor("List.textForeground"));
      commonIcon = UIManager.getIcon("Tree.leafIcon");
    }

    public Component getListCellRendererComponent(JList list, Object value,
               int index, boolean isSelected, boolean hasFocus) {
      setEnabled(list.isEnabled());
      check.setSelected(((CheckableItem)value).isSelected());
      label.setFont(list.getFont());
      label.setText(value.toString());
      label.setSelected(isSelected);
      label.setFocus(hasFocus);
      Icon icon = ((CheckableItem)value).getIcon();
      if (icon == null) {
        icon = commonIcon;
      }
      label.setIcon(icon);
      return this;
    }
  } 

  public static void main(String args[]) {
    CheckListExample frame = new CheckListExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {System.exit(0);}
    });
    frame.setSize(300, 200);
    frame.setVisible(true);
  } 
}
=============================================

/*  swing1.1 */
 
package jp.gr.java_conf.tame.swing.tree;

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.plaf.ColorUIResource;


/**
 * @version 1.1 04/24/99
 */
public class CheckRenderer extends JPanel implements TreeCellRenderer {
  protected JCheckBox check;
  protected TreeLabel label;
  
  public CheckRenderer() {
    setLayout(null);
    add(check = new JCheckBox());
    add(label = new TreeLabel());
    check.setBackground(UIManager.getColor("Tree.textBackground"));
    label.setForeground(UIManager.getColor("Tree.textForeground"));
  }

  public Component getTreeCellRendererComponent(JTree tree, Object value,
               boolean isSelected, boolean expanded,
               boolean leaf, int row, boolean hasFocus) {
    String  stringValue = tree.convertValueToText(value, isSelected,
			expanded, leaf, row, hasFocus);
    setEnabled(tree.isEnabled());
    check.setSelected(((CheckNode)value).isSelected());
    label.setFont(tree.getFont());
    label.setText(stringValue);
    label.setSelected(isSelected);
    label.setFocus(hasFocus);
    if (leaf) {
      label.setIcon(UIManager.getIcon("Tree.leafIcon"));
    } else if (expanded) {
      label.setIcon(UIManager.getIcon("Tree.openIcon"));
    } else {
      label.setIcon(UIManager.getIcon("Tree.closedIcon"));
    }	    
    return this;
  }
  
  public Dimension getPreferredSize() {
    Dimension d_check = check.getPreferredSize();
    Dimension d_label = label.getPreferredSize();
    return new Dimension(d_check.width  + d_label.width,
      (d_check.height < d_label.height ?
       d_label.height : d_check.height));
  }
  
  public void doLayout() {
    Dimension d_check = check.getPreferredSize();
    Dimension d_label = label.getPreferredSize();
    int y_check = 0;
    int y_label = 0;
    if (d_check.height < d_label.height) {
      y_check = (d_label.height - d_check.height)/2;
    } else {
      y_label = (d_check.height - d_label.height)/2;
    }
    check.setLocation(0,y_check);
    check.setBounds(0,y_check,d_check.width,d_check.height);
    label.setLocation(d_check.width,y_label);    
    label.setBounds(d_check.width,y_label,d_label.width,d_label.height);    
  }
   
  
  public void setBackground(Color color) {
    if (color instanceof ColorUIResource)
      color = null;
    super.setBackground(color);
  }
  
    
  public class TreeLabel extends JLabel {
    boolean isSelected;
    boolean hasFocus;
    
    public TreeLabel() {
    }
        
    public void setBackground(Color color) {
	if(color instanceof ColorUIResource)
	    color = null;
	super.setBackground(color);
    } 
         
    public void paint(Graphics g) {
      String str;
      if ((str = getText()) != null) {
        if (0 < str.length()) {
          if (isSelected) {
            g.setColor(UIManager.getColor("Tree.selectionBackground"));
          } else {
            g.setColor(UIManager.getColor("Tree.textBackground"));
          }
          Dimension d = getPreferredSize();
          int imageOffset = 0;
          Icon currentI = getIcon();
          if (currentI != null) {
            imageOffset = currentI.getIconWidth() + Math.max(0, getIconTextGap() - 1);
          }
          g.fillRect(imageOffset, 0, d.width -1 - imageOffset, d.height);
          if (hasFocus) {
            g.setColor(UIManager.getColor("Tree.selectionBorderColor"));
            g.drawRect(imageOffset, 0, d.width -1 - imageOffset, d.height -1);     
         }
        }
      }
      super.paint(g);
    }
  
    public Dimension getPreferredSize() {
      Dimension retDimension = super.getPreferredSize();
      if (retDimension != null) {
        retDimension = new Dimension(retDimension.width + 3,
				 retDimension.height);
      }
      return retDimension;
    }
    
    public void setSelected(boolean isSelected) {
      this.isSelected = isSelected;
    }
    
    public void setFocus(boolean hasFocus) {
      this.hasFocus = hasFocus;
    }
  }
}