$ javac  src/GcNamesDemo.java && java -XX:+UseZGC GcNamesDemo     (21.0.12.1)
gc bean         : ZGC Cycles
gc bean         : ZGC Pauses

$ javac  src/GcNamesDemo.java && java -XX:+UseZGC -XX:+ZGenerational GcNamesDemo     (21.0.12.1)
gc bean         : ZGC Minor Cycles
gc bean         : ZGC Minor Pauses
gc bean         : ZGC Major Cycles
gc bean         : ZGC Major Pauses