Jtree inside JScrollPanel not working

Jtree inside JScrollPanel not working

DefaultMutableTreeNode myComputer = new DefaultMutableTreeNode("My
Computer");
DefaultMutableTreeNode c = new DefaultMutableTreeNode("Local Disk(C:)");
DefaultMutableTreeNode vinod = new DefaultMutableTreeNode("Vinod");
DefaultMutableTreeNode swing = new DefaultMutableTreeNode("Swing");
DefaultMutableTreeNode tr = new DefaultMutableTreeNode("Tree");
DefaultMutableTreeNode a = new DefaultMutableTreeNode("3½ Floppy(A:)");
DefaultMutableTreeNode e = new DefaultMutableTreeNode("New Volume(E:)");
c.add(vinod);
vinod.add(swing);
swing.add(tr);
myComputer.add(c);
myComputer.add(a);
myComputer.add(e);
JTree tree = new JTree(myComputer);
JScrollPane scrollPane = new JScrollPane(tree);
jPanel1.add(scrollPane);
tree.setVisible(true);
I got the new tree example from the web, but when I try to show it, it
does not appear! I dont know why. Any ideas? Thank you!