DefaultTreeCellRenderer: setOpenIcon(Icon newIcon) : DefaultTreeCellRenderer « javax.swing.tree « Java by API

1. Java by API
2. javax.swing.tree
3. DefaultTreeCellRenderer

DefaultTreeCellRenderer: setOpenIcon(Icon newIcon)

import java.awt.BorderLayout;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;

public class MainClass extends JFrame {
  JTree tree;

  DefaultTreeModel treeModel;

  public MainClass() {
    super("Tree Test Example");
    setSize(200, 150);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

  }

  public void init() {
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
    DefaultMutableTreeNode subroot = new DefaultMutableTreeNode("SubRoot");
    DefaultMutableTreeNode leaf1 = new DefaultMutableTreeNode("Leaf 1");
    DefaultMutableTreeNode leaf2 = new DefaultMutableTreeNode("Leaf 2");

    treeModel = new DefaultTreeModel(root);
    tree = new JTree(treeModel);

    treeModel.insertNodeInto(subroot, root, 0);
    subroot.add(leaf1);
    root.add(leaf2);

    tree.putClientProperty("JTree.lineStyle", "Angled");
    getContentPane().add(tree, BorderLayout.CENTER);

    DefaultTreeCellRenderer renderer = 
      (DefaultTreeCellRenderer)tree.getCellRenderer();
    renderer.setClosedIcon(new ImageIcon("door.closed.gif"));
    renderer.setOpenIcon(new ImageIcon("door.open.gif"));
    renderer.setLeafIcon(new ImageIcon("world.gif"));

  
  }

  public static void main(String args[]) {
    MainClass tt = new MainClass();
    tt.init();
    tt.setVisible(true);
  }
}

           
       

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