Java Reference
In-Depth Information
Listing 17-5.
Using the Custom Book Cell Renderer
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.util.*;
public class BookTree {
public static void main(String args[]) {
Runnable runner = new Runnable() {
public void run() {
JFrame frame = new JFrame("Book Tree");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Book javaBooks[] = {
new Book("Core Java 2", "Horstmann/Cornell", 49.99f),
new Book("Effective Java", "Bloch", 34.99f),
new Book("Java Collections", "Zukowski", 49.95f)
};
Book netBooks[] = {
new Book("Beginning VB .NET 1.1 Databases", "Maharry", 49.99f),
new Book("Beginning VB.NET Databases", "Willis", 39.99f)
};
Vector<Book> javaVector = new NamedVector<Book>("Java Books", javaBooks);
Vector<Book> netVector = new NamedVector<Book>(".NET Books", netBooks);
Object rootNodes[] = {javaVector, netVector};
Vector<Object> rootVector = new NamedVector<Object>("Root", rootNodes);
JTree tree = new JTree(rootVector);
TreeCellRenderer renderer = new BookCellRenderer();
tree.setCellRenderer(renderer);
JScrollPane scrollPane = new JScrollPane(tree);
frame.add(scrollPane, BorderLayout.CENTER);
frame.setSize(300, 300);
frame.setVisible(true);
}
};
EventQueue.invokeLater(runner);
}
}
■
Note
Don't worry about the details of
DefaultMutableTreeNode
just yet. Unless otherwise directed, all the
nodes of every tree are a
DefaultMutableTreeNode
. Each array element placed in a
Vector
in Listing 17-5
defines the data for that specific node. This data is then stored in the
userObject
property of its
DefaultMutableTreeNode
.
