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                            ## ArrayList的 contains原理
ArrayList是只比較equals的返回值 .性能比較低,因為會把集合中的每個元素都拿出來進行比較.

## HashSet的 contains原理
HashSet的contains原理和add原理是一樣的,先判斷哈希值,再判斷equals比較內容.

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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