testtree3.java

精通Java核心技术源代码

// TestTree3.java
// A Simple test to see how we can build a tree and customize its icons.
//
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.tree.*;

public class TestTree3 extends JFrame {

  JTree tree;
  DefaultTreeModel treeModel;

  public TestTree3() {
    super("Tree Test Example");
    setSize(200, 150);
    addWindowListener(new BasicWindowMonitor());

    // Add in 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 hashtable
    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);
  }
}