$ javac src/Snippets.java && java Snippets     (28-beta+21-ea)
Response[user=Alice, order=42]
Response[user=Alice, order=42]
[1, 2]
a
Response[user=Alice, order=42]

$ javac src/QuickReference.java && java QuickReference     (28-beta+21-ea)
quick reference compiled and ran