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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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