Berkeley YACC parser generator extended to generate Java code

 BYACC/J is an extension of the Berkeley v 1.8 YACC-compatible parser
 generator.
 .
 Standard YACC takes a YACC source file, and generates one or more C files from
 it, which if compiled properly, will produce a LALR-grammar parser. This is
 useful for expression parsing, interactive command parsing, and file reading.
 Many megabytes of YACC code have been written over the years.
 .
 This is the standard YACC tool that is in use every day to produce C/C++
 parsers.
 .
 I have added a "-J" flag which will cause BYACC to generate Java source code,
 instead. So there finally is a YACC for Java now!