How do I generate the default files for creating lexical and syntactical analyzer in javacc

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Java

Hello everyone, please I need help in generating the default files in javaCC using Eclipse. I have installed JavaCC on my laptop and it's working. I'm to write PARSER_BEGIN(MyFile) and PARSER_END(MyFile) and be able to generate these files:

MyFile.java - contains the syntactical analyzer
MyFileTokenManager.java - contains the lexical analyzer
MyFileConstants.java - contains different constants for the analysis process.
Please how do I generate these files from my Eclipse? Thanks for any help.

What I have tried:

public class MyFile {
	
	PARSER_BEGIN(MyFile)
	
	
	PARSER_END(MyFile)

}

This file is meant to be a java.jj file and not MyFile.java but I don't know how to create it the .jj file and generate the default files.