in java JLex(JFlex)

how to count token, add them up and finally print an integer? the code i got here print out specific id, but all i want is to find an id, add them like count+=1(not showing on the screen), and in the end just print an integer as a result.

import java.io.*; %% %{ public static void main(String argv[]) throws java.io.IOException { MyLexer yy = new MyLexer(new FileReader("A2.input")); while (true){ yy.yylex(); } } %} %notunix %integer; %class MyLexer %eofval{ return; %eofval}

IDENTIFIER = [a-zA-Z_][a-zA-Z0-9_]* %%

{IDENTIFIER} { System.out.println("ID is ..." + yytext());}

| {} . {}