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                            ### 同步容器
同步容器類是將它們的狀態封裝起來，并對每個公有方法都進行同步，使得每次只有一個線程能訪問容器的狀態；
同步容器將所有對容器狀態的訪問都串行化，以實現線程安全；代價是嚴重降低并發性，當多個線程競爭鎖時，吞吐量將嚴重降低；

實現類：
* Vector
* CopyOnWriteArraySet


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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