public class parser {

//   Jay parser - does parsing and displays the abstract syntax.

public static void main(String args[]) {
   TokenStream MyProgram = new TokenStream(args[0]);
   ConcreteSyntax C  = new ConcreteSyntax(MyProgram);

   System.out.println("Begin parsing... " + args[0]);
   Program A = C.program();   // parse and generate abstract syntax tree
   A.display();               // display abstract syntax tree    
}

}