I don't think that is fair 1.5 introduced the enum keyword. That was not a fun change in a codebase I worked on. Java 6 and later are more sticklers in what is

I don't think that is fair 1.5 introduced the enum keyword. That was not a fun change in a codebase I worked on. Java 6 and later are more sticklers in what is allowed by the api contacts and not breaking those than in the sun days.