Based on [[JavaPerm]] P381
- An anon class requires an actual *.class file created by javac compiler and loaded from serialized form (usually disk).
- No such class file for a lambda.
More than half the interview questions are about fancy theoretical knowledge, so this is knowledge valuable to interviews.
This difference has very limited performance impact, as of java 8. This performance perspective is unimportant to interviews, IMHO.java