import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
public class MainClass {
public static void main(String args[]) {
JFrame f = new JFrame("JTree Sample");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTree tree = new JTree();
JScrollPane scrollPane = new JScrollPane(tree);
f.add(scrollPane, BorderLayout.CENTER);
f.setSize(300, 200);
f.setVisible(true);
}
}