Not just most, I&#x27;m betting the overwhelming majority of Java code will compile. But all popular languages break small things with every release (and this is probably a good thing in the long run), so look hard enough and you&#x27;re guaranteed to find code that won&#x27;t work.<p>For instance, here&#x27;s the compatibility guide to Java 8: <a href="http:&#x2F;&#x2F;www.oracle.com&#x2F;technetwork&#x2F;java&#x2F;javase&#x2F;8-compatibility-guide-2156366.html" rel="nofollow">http:&#x2F;&#x2F;www.oracle.com&#x2F;technetwork&#x2F;java&#x2F;javase&#x2F;8-compatibilit...</a>