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                            #### 5.Synchrpnized和lock的區別
（1）synchronized是關鍵字，lock是一個類
（2）?synchronized在發生異常時會自動釋放鎖，lock需要手動釋放鎖
（3）synchronized是可重入鎖、非公平鎖、不可中斷鎖，lock的ReentrantLock是可重入鎖，可中斷鎖，可以是公平鎖也可以是非公平鎖
（4）synchronized是JVM層次通過監視器實現的，Lock是通過AQS實現的
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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