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Oops! the synchronized keyword is useless? who invented it for what?

Yes, man. Especially in desktop apps which have GUI and background tasks running together.

So we should use synchronization where it requires. That's what I'd like to point out.

Hi Kevin,

Sorry I didn't notice that he is 'banned'. Synchronization is not performance penalty anymore, see this.

Also, thread-safe should be considered over performance. It's not good to...