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                            #### 同步鎖
```
對象的同步鎖只是一個概念,可以想象為在對象上標記了一個鎖. 
1. 鎖對象 可以是任意類型。 
2. 多個線程對象  要使用同一把鎖。
注意:在任何時候,最多允許一個線程擁有同步鎖,誰拿到鎖就進入代碼塊,其他的線程只能在外等著 (BLOCKED)。
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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