Expert Solutions

import java.io.PrintStream; public class Ruler extends Button {     public Ruler()     {         mid1 = 77;     }     public void init()     {         setBackground(Color.GRAY);     }     public void paint(Graphics g)     {         drawNum(g, 10, 520, 12, mid1, 1);         drawRuler(g, 10, 520, 8);     }     private void drawRuler(Graphics g, int left, int right, int level)     {         if(level < 1)         {             return;         } else         {  ...