Build a tree and customize its icons

    
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/
// TestTree4.java
//Another test to see how we can build a tree and customize its icons.
//This example does not affect the icons of other trees.
//

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

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

public class TestTree4 extends JFrame {

  JTree tree1, tree2;

  DefaultTreeModel treeModel;

  public TestTree4() {
    super("Custom Icon Example");
    setSize(350, 450);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    // 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 hashtable
    tree1 = new JTree(worldHash);
    tree2 = new JTree(worldHash);

    DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) tree2
        .getCellRenderer();
    renderer.setClosedIcon(new ImageIcon("door.closed.gif"));
    renderer.setOpenIcon(new ImageIcon("door.open.gif"));
    renderer.setLeafIcon(new ImageIcon("world.gif"));

    JSplitPane pane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, tree1,
        tree2);

    getContentPane().add(pane, BorderLayout.CENTER);
  }

  public static void main(String args[]) {
    TestTree4 tt = new TestTree4();
    tt.setVisible(true);
  }
}

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Build a tree and customize its icons : Tree « Swing JFC « Java

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