Hide horizontal and vertical lines in a JTree

tree.putClientProperty("JTree.lineStyle", "None");

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
class Testing
{
  boolean showLines = false;
  public void buildGUI()
  {
    JButton btn = new JButton("Show/Hide Lines");
    final JTree tree = new JTree();
    tree.setUI(new javax.swing.plaf.basic.BasicTreeUI(){
      protected void paintHorizontalLine(Graphics g,JComponent c,int y,int left,int right){
        if(showLines) super.paintHorizontalLine(g,c,y,left,right);
      }
      protected void paintVerticalLine(Graphics g,JComponent c,int x,int top,int bottom){
        if(showLines) super.paintVerticalLine(g,c,x,top,bottom);
      }
    });
    JFrame f = new JFrame();
    f.getContentPane().add(new JScrollPane(tree),BorderLayout.CENTER);
    f.getContentPane().add(btn,BorderLayout.SOUTH);
    f.setSize(200,200);
    f.setLocationRelativeTo(null);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
    btn.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        showLines = !showLines;
        tree.repaint();
      }
    });
  }
  public static void main(String[] args)
  {
    SwingUtilities.invokeLater(new Runnable(){
      public void run(){
        try{UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");}catch(Exception e){}
        new Testing().buildGUI();
      }
    });
  }
}