How would I return a production rule for each character? (JAVA)

So in this case the alphabet consists of "AB+ The initial generation i "A". The production rules are (A +B-A-B+), (B -A+B+A-). This means that when nextGen is called with "A the only rule that applies is the first production rule and so a new String is created that contains only "+B-A-B+ If nextGen were called on that, the process is the same namely for each character we look at the production rules to see if one applies and then replace that in the result string with the production So here is a fu look at nextGen for "+B-A-B+": Character Production rule Result so far none B A+B+A- A+B+A- +-A+B+A-- none A +B-A-B+ +-A+B+A--+B-A-B+ +-A+B+A--+B-A-B+- none B A+B+A- A+B+A--+B-A-B+--A+B+A. +-A+B+A--+B-A-B+--A+B+A-+ none