If you anticipate to get any meaningful results, you really should test with a bit more non-trivial code. Fernflower was created with the aim of handling highly unusual and obfuscated bytecode. Thus decompiling such simple snippets is no big deal. By the way, if you are interested in testing the stand-alone version of Fernflower drop me a note at fernflower(dot)decompiler(at)gmail(dot)com. Version 0.8.4 is now in semi-public beta (however not available on the website yet).