Can program developed with Java 8 be run on Java 7?

Question

I am a little confused.

1. Oracle says Java 8 is highly compatible with Java 7 (backward). But, what possibilities exist that Java 8 program can be run on Java

Answer 1

I generated stubs from WSDL, compiled in java 8 and was able to deploy them on server having java 1.6 jvm on it.