Installs custom icons

    
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/
// TestTree3.java
//A variation on TestTree that installs custom icons. The icons installed
//will appear on *every* tree.
//

import java.awt.BorderLayout;
import java.util.Hashtable;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.UIManager;
import javax.swing.tree.DefaultTreeModel;

public class TestTree3 extends JFrame {

  JTree tree;

  DefaultTreeModel treeModel;

  public TestTree3() {
    super("Tree Test Example");
    setSize(200, 150);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    // Add our own customized tree icons.
    UIManager.put("Tree.leafIcon", new ImageIcon("world.gif"));
    UIManager.put("Tree.openIcon", new ImageIcon("door.open.gif"));
    UIManager.put("Tree.closedIcon", new ImageIcon("door.closed.gif"));
    UIManager.put("Tree.expandedIcon", new ImageIcon("unlocked.gif"));
    UIManager.put("Tree.collapsedIcon", new ImageIcon("locked.gif"));
  }

  public void init() {
    // Build the hierarchy of containers & objects.
    String[] schoolyard = { "School", "Playground", "Parking Lot", "Field" };
    String[] mainstreet = { "Grocery", "Shoe Shop", "Five & Dime",
        "Post Office" };
    String[] highway = { "Gas Station", "Convenience Store" };
    String[] housing = { "Victorian_blue", "Faux Colonial",
        "Victorian_white" };
    String[] housing2 = { "Mission", "Ranch", "Condo" };
    Hashtable homeHash = new Hashtable();
    homeHash.put("Residential 1", housing);
    homeHash.put("Residential 2", housing2);

    Hashtable cityHash = new Hashtable();
    cityHash.put("School grounds", schoolyard);
    cityHash.put("Downtown", mainstreet);
    cityHash.put("Highway", highway);
    cityHash.put("Housing", homeHash);

    Hashtable worldHash = new Hashtable();
    worldHash.put("My First VRML World", cityHash);

    // Build our tree out of our big hash table.
    tree = new JTree(worldHash);

    // Pick an angled line style.
    tree.putClientProperty("JTree.lineStyle", "Angled");
    getContentPane().add(tree, BorderLayout.CENTER);
  }

  public static void main(String args[]) {
    TestTree3 tt = new TestTree3();
    tt.init();
    tt.setVisible(true);
  }
}

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Installs custom icons : Tree « Swing JFC « Java

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