FileDocCategorySizeDatePackage
TreeDemo.javaAPI DocExample4020Wed Aug 08 15:13:52 BST 2001None

TreeDemo

public class TreeDemo extends DemoModule
JTree Demo
version
1.3 10/10/99
author
Jeff Dinkins

Fields Summary
Constructors Summary
public TreeDemo(SwingSet2 swingset)
TreeDemo Constructor

	// Set the title for this demo, and an icon used to represent this
	// demo inside the SwingSet2 app.
	super(swingset, "TreeDemo", "toolbar/JTree.gif");

	getDemoPanel().add(createTree(), BorderLayout.CENTER);
Methods Summary
public javax.swing.JScrollPanecreateTree()

        DefaultMutableTreeNode top = new DefaultMutableTreeNode(getString("TreeDemo.music"));
        DefaultMutableTreeNode catagory = null ;
	DefaultMutableTreeNode artist = null;
	DefaultMutableTreeNode record = null;

	// open tree data 
	URL url = getClass().getResource("/resources/tree.txt");

	try {
	    // convert url to buffered string
	    InputStream is = url.openStream();
	    InputStreamReader isr = new InputStreamReader(is);
	    BufferedReader reader = new BufferedReader(isr);

	    // read one line at a time, put into tree
	    String line = reader.readLine();
	    while(line != null) {
		// System.out.println("reading in: ->" + line + "<-");
		char linetype = line.charAt(0);
		switch(linetype) {
		   case 'C":
		     catagory = new DefaultMutableTreeNode(line.substring(2));
		     top.add(catagory);
		     break;
		   case 'A":
		     if(catagory != null) {
		         catagory.add(artist = new DefaultMutableTreeNode(line.substring(2)));
		     }
		     break;
		   case 'R":
		     if(artist != null) {
		         artist.add(record = new DefaultMutableTreeNode(line.substring(2)));
		     }
		     break;
		   case 'S":
		     if(record != null) {
		         record.add(new DefaultMutableTreeNode(line.substring(2)));
		     }
		     break;
		   default:
		     break;
		}
		line = reader.readLine();
	    }
	} catch (IOException e) {
	}

	JTree tree = new JTree(top) {
	    public Insets getInsets() {
		return new Insets(5,5,5,5);
	    }
	};
	return new JScrollPane(tree);
public static voidmain(java.lang.String[] args)
main method allows us to run as a standalone demo.

	TreeDemo demo = new TreeDemo(null);
	demo.mainImpl();