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                在ConcurrentHashMap(1.8)中,內部使用一個volatile的數組table保存數據,在獲取數組的元素時,采用Unsafe類的getObjectVolatile方法,在設置數組元素時,采用compareAndSwapObject方法 因為Java數組在元素層面的元數據設計上的缺失,無法表達元素是final、volatile等語義,所以開了后門,使用getObjectVolatile用來補上無法表達元素是volatile的坑,用來補上final的坑,數組元素就跟沒有標volatile的成員字段一樣,無法保證線程之間可見性
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