I have recently begun studying Java and understand the concept and functationalityof compiling the Java file and the creation of the class file. However,in the event that I cannot successfully compile a Java file, I am essentiallystuck. I am using JDK 1.2.1 and JBuilder as a debugger. In running thefollowing linesublic void init() {Rectgl r = new Rectgl(10,5,Color.red);Square s = new Square(10,Color.blue);Circle c = new Circle(20,Color.yellow);Square s2 = new Square(40,Color.green);add(r);add(s);add(c);add(s2);add(new PixLabel(r));add(new PixLabel(s));add(new PixLabel(c));add(new PixLabel(s2));I received a debug error in JBuilder stating:"Error (11)class Rectgl not found in class PixApplet"This error occurs for all of the referenced shapes.Looks as if it isn't pointing to some necessary files or something? I don'tknow, can anyone help?