Java Programming:  

Use your own thread to give life to the fan. (Make the fan spin)

Use your own GUI to start and stop as you wish. (Start and Stop Button)

 import javax.swing.JFrame; import javax.swing.JPanel; import java.awt.Graphics; public class DrawArcs extends JFrame { public DrawArcs() { setTitle("DrawArcs"); add(new ArcsPanel()); } /** Main method */  public static void main(String[] args) { DrawArcs frame = new DrawArcs(); frame.setLocationRelativeTo(null); // Center the frame  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(250, 300); frame.setVisible(true); } } // The class for drawing arcs on a panel class ArcsPanel extends JPanel { @Override protected void paintComponent(Graphics g) { super.paintComponent(g); int xCenter = getWidth() / 2; int yCenter = getHeight() / 2; int radius = (int)(Math.min(getWidth(), getHeight()) * 0.4); int x = xCenter - radius; int y = yCenter - radius; g.fillArc(x, y, 2 * radius, 2 * radius, 0, 30); g.fillArc(x, y, 2 * radius, 2 * radius, 90, 30); g.fillArc(x, y, 2 * radius, 2 * radius, 180, 30); g.fillArc(x, y, 2 * radius, 2 * radius, 270, 30); } }