import java.awt.BorderLayout;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JSlider;
import javax.swing.UIDefaults;
import javax.swing.UIManager;
public class SlidersThumbIcon {
public static void main(String args[]) {
JFrame frame = new JFrame("Tick Slider");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// No Ticks
JSlider jSliderOne = new JSlider();
Icon icon = new ImageIcon("yourFile.gif");
UIDefaults defaults = UIManager.getDefaults();
defaults.put("Slider.horizontalThumbIcon", icon);
frame.add(jSliderOne, BorderLayout.NORTH);
frame.setSize(300, 200);
frame.setVisible(true);
}
}