What is significance of putting “$” sign before a parameter in Java / Android?

Question

What is the difference or significance of putting $ sign before any variable or parameter..

e.g.

Suppose here is my class...

 public class Vecto         


        

Answer 1

According to the Java Language Specification, it's permissible, but has no special meaning. Note that the specification goes on to recommend that it "only be used in mechanically generated source code, or rarely, to access pre-existing names in a legacy system".