final 修飾 class member just like const in c++;
synchronized means thread safe
final 修飾成員變量相當(dāng)于cpp中的const修飾
synchronized 相當(dāng)于是聲明原子操作,同一個(gè)對(duì)象的不同synchronized語(yǔ)句塊是線程安全的,是synchrony的,,,
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