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

compiles and runs. kid you not.

package $;

public class $
{
    int $;

    int $(int $){ return $; }
    void $$(int $){ this.$=$; }

    $ _(){ return this; }

    $ _;

    {
        $$($($));

        _._()._._()._();
    }
}