mad_fox9007,

There is no way to write Java code that isn't easy to compile. When you call javac.exe(or hit compile in your IDE), a .class file is created which contains byte code. This byte code is universal for Java, which is the reason it's so popular. Every computer with the same version of Java installed runs the code, the developer doesn't have to worry about porting code.

What you are looking for is an obfuscator. Google is your friend here. Obsfucators and decompilers is like an arms race, there are tons of options, commercial and open source.