Show tick marks for JSlider in Java

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import javax.swing.JFrame;
import javax.swing.JSlider;

public class Main {
  public static void main(String[] args) {
    JFrame f = new JFrame();
    int initValue = 20;
    int minimum = 10;
    int maximum = 100;

    JSlider slider = new JSlider(JSlider.VERTICAL, minimum, maximum, initValue);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
    slider.setPaintTicks(true);
    
    f.add(slider);
    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);
  }
}