TestTree.java Source code

Introduction

Here is the source code for TestTree.java

Source

/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/

// TestTree.java
//A simple test to see how we can build a tree and populate it. We build
//the tree structure up by hand in this case.
//

import java.awt.BorderLayout;

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

public class TestTree extends JFrame {

    JTree tree;

    DefaultTreeModel treeModel;

    public TestTree() {
        super("Tree Test Example");
        setSize(400, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    public void init() {
        // Build up a bunch of TreeNodes. We use DefaultMutableTreeNode because
        // the
        // DefaultTreeModel can use it to build a complete tree.
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
        DefaultMutableTreeNode subroot = new DefaultMutableTreeNode("SubRoot");
        DefaultMutableTreeNode leaf1 = new DefaultMutableTreeNode("Leaf 1");
        DefaultMutableTreeNode leaf2 = new DefaultMutableTreeNode("Leaf 2");

        // Build our tree model starting at the root node, and then make a JTree
        // out
        // of that.
        treeModel = new DefaultTreeModel(root);
        tree = new JTree(treeModel);

        // Build the tree up from the nodes we created.
        treeModel.insertNodeInto(subroot, root, 0);
        // Or, more succinctly:
        subroot.add(leaf1);
        root.add(leaf2);

        // Display it.
        getContentPane().add(tree, BorderLayout.CENTER);
    }

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