help, protect my work from decompiler

hi, experts,

i feel very angry after my friend told me that someone used a decompiler to extract code from my .class files.

anyone can teach me how to prevent it happen again?

best regards
Who is Participating?
You really can't; even so called 'obfuscators' can only make your code a bit mixed up.
but I doubt if the friend told the truth; is your work of worldwide importance?
Besides, your comments are the most invaluable part and those can NEVER be obtained by others.

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