import javax.swing.*;
import javax.swing.event.*;

public class JTreeNone{

	public static void main(String[] args){
		JTree tree = new JTree();
		tree.putClientProperty("JTree.lineStyle", "None");
		JScrollPane scrollpane = new JScrollPane(tree);
		JFrame fm = new JFrame("JTreeNone frame");
		fm.getContentPane().add(scrollpane, "Center");
		fm.setSize(300,300);
		fm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		fm.setVisible(true);
	}
}