Hello just want to understand what is the meaning of the code that i have highlighted, like why ThreeD sh = (ThreeD) ss;

has to be in "(ThreeD)", like what is the code looking out for? Is there any other possible way i can code it? and also what does "(Shape ss)" mean exactly. Thank you!

//prints some detials of 3d object private static void process 3DShape (Shape ss) { ThreeD sh = (ThreeD) ss; String type =""; if(sh.toString().contains("Cube")) { } type = "Cube"; } else if(sh.toString().contains("Sphere")) { type = "Sphere"; } else { } type = "Tetrahedron"; System.out.println("I am a "+type+" shape"); System.out.println("-- .");