TreeDemopublic class TreeDemo extends DemoModule
| Constructors Summary |
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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);
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| Methods Summary |
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| public javax.swing.JScrollPane | createTree()
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 void | main(java.lang.String[] args)main method allows us to run as a standalone demo.
TreeDemo demo = new TreeDemo(null);
demo.mainImpl();
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