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nfc社交社交源码synchronize(obj){
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nfc社交社交源码} synchronize(obj){
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nfc社交社交源码}
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nfc社交社交源码condition.await();
nfc社交社交源码lock.unlock(); lock.lock();
nfc社交社交源码condition.signal();
nfc社交社交源码lock.unlock();
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