More Swing components - An Introduction to Graphical User Interfaces with Java Swing - page 190

27.

DefaultMutableTreeNode beechG
= new DefaultMutableTreeNode("Green Leaved");

28.
29.

biologyTreeModel = new DefaultTreeModel(root);

30.

biologyTreeModel.insertNodeInto(leaved ,root ,0);

31.

biologyTreeModel.insertNodeInto(conifer,root ,1);

32.

biologyTreeModel.insertNodeInto(beech ,leaved ,0);

33.

biologyTreeModel.insertNodeInto(oak ,leaved ,1);

34.

biologyTreeModel.insertNodeInto(birch ,leaved ,1);

35.

biologyTreeModel.insertNodeInto(pine ,conifer,0);

36.

biologyTreeModel.insertNodeInto(fir ,conifer,1);

37.

biologyTreeModel.insertNodeInto(beechR ,beech ,0);

38.

biologyTreeModel.insertNodeInto(beechG ,beech ,1);

39.

}

40. }

File: its/Trees/TreeFrame.java

1. package its.Trees;
2.
3. import its.SimpleFrame.SimpleFrame;
4. import java.awt.*;
5.
6. public class TreeFrame extends SimpleFrame {
7.
8.

public TreeFrame() {

9.

this .setSize(300,500);

10.

BiologyTree bioTree = new BiologyTree();

11.

this .getContentPane().add(bioTree,BorderLayout.CENTER);

12.

}

13.
14.

public static void main(String[] args) {

15. TreeFrame treeFrame = new TreeFrame();

16. treeFrame.showIt("Tree Frame");

17. }

18. }

In the second application we generate a directory tree. The tree is con-
structed recursively by method recursion .Weonly list the class Directory-
Tree . The tree displays the directory structure of the its -package. The frame
class DirectoryFrame and the driver class DirectoryDriver can be down-
loaded from the topic's home page. The results of both applications are shown in
Figure 16.7.