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From the grammar

1. The lexer rules will create the lexer class
2. The parser rules will create the parser class

The classes generated will contain a method for each rule in the grammar.

See example

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Example

from the getting started with the below Hello grammar

grammar Hello; 
r  : 'hello' ID ; 
ID : [a-z]+ ; 
WS : [ \t\r\n]+ -> skip ; 

• after installation of antlr

antlr4 Hello.g4

Next to the grammar file, you got:

• the lexer HelloLexer.java - to create the tokens
• the parser HelloParser.java - to build the tree
• the listener HelloListener.java - to traverse the tree

ls -A1

Hello.g4
Hello.interp
Hello.tokens
HelloBaseListener.java
HelloLexer.interp
HelloLexer.java
HelloLexer.tokens
HelloListener.java
HelloParser.java