How to resize the Icon such as 1.gif, 2.gif, 3.gif etc at my will??

Question

Dear friends:
I have following code to add the Icon to the nodes of the JTree,
But I hope to resize the Icon such as 1.gif, 2.gif, 3.gif etc at my will, not fixed one, How can I do it??
Thanks
Sunny
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
/** JTree with missing or custom icons at the tree nodes.
*  1999 Marty Hall, http://www.apl.jhu.edu/~hall/java/
public class CustomIcons extends JFrame {
  public static void main(String[] args) {
    new CustomIcons();
  private ImageIcon customOpenIcon           = new ImageIcon("1.gif");
  private ImageIcon customClosedIcon      = new ImageIcon("2.gif");
  private ImageIcon customLeafIcon           = new ImageIcon("3.gif");
  public CustomIcons() {
    super("JTree Selections");
//   WindowUtilities.setNativeLookAndFeel();
//   addWindowListener(new ExitListener());
    Container content = getContentPane();
    content.setLayout(new FlowLayout());
    DefaultMutableTreeNode root =
      new DefaultMutableTreeNode("Root");
    DefaultMutableTreeNode child;
    DefaultMutableTreeNode grandChild;
    for(int childIndex=1; childIndex<4; childIndex++) {
      child = new DefaultMutableTreeNode("Child " + childIndex);
      root.add(child);
      for(int grandChildIndex=1; grandChildIndex<4; grandChildIndex++) {
        grandChild =
          new DefaultMutableTreeNode("Grandchild " + childIndex +
                                     "." + grandChildIndex);
        child.add(grandChild);
    JTree tree1 = new JTree(root);
    tree1.expandRow(1); // Expand children to illustrate leaf icons
    JScrollPane pane1 = new JScrollPane(tree1);
    pane1.setBorder(BorderFactory.createTitledBorder("Standard Icons"));
    content.add(pane1);
    JTree tree2 = new JTree(root);
    tree2.expandRow(2); // Expand children to illustrate leaf icons
    DefaultTreeCellRenderer renderer2 = new DefaultTreeCellRenderer();
    renderer2.resize(100, 100);
    renderer2.setOpenIcon(null);
    renderer2.setClosedIcon(null);
    renderer2.setLeafIcon(null);
    tree2.setCellRenderer(renderer2);
    JScrollPane pane2 = new JScrollPane(tree2);
    pane2.setBorder(BorderFactory.createTitledBorder("No Icons"));
    content.add(pane2);
    JTree tree3 = new JTree(root);
    tree3.expandRow(3); // Expand children to illustrate leaf icons
    DefaultTreeCellRenderer renderer3 = new DefaultTreeCellRenderer();
    //renderer3.setPreferredSize(new Dimension(100, 100));
    renderer3.setOpenIcon(customOpenIcon);
    renderer3.setClosedIcon(customClosedIcon);
    renderer3.setLeafIcon(customLeafIcon);
    tree3.setCellRenderer(renderer3);
    JScrollPane pane3 = new JScrollPane(tree3);
    pane3.setBorder(BorderFactory.createTitledBorder("Custom Icons"));
    content.add(pane3);
    pack();
    setVisible(true);
}

Answer 1

Thanks,
I declare as :
  private ImageIcon customOpenIcon           = new ImageIcon("com/aa/1.gif");
  private ImageIcon customClosedIcon      = new ImageIcon("com/aa/2.gif");
  private ImageIcon customLeafIcon           = new ImageIcon("com/aa/3.gif");but which method for customOpenIcon can be used as scale its size??
Is it
customOpenIcon.getImage().SCALE_AREA_AVERAGING;??
why show red??
I checked these, cannot find it, can you advice more or I select a wrong component??
Thank
sunny