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966 단어 수기
String, StringBuilder, StringBuffer  
1.String    
2.String     
3.StringBuilder StringBuffer

Map
1.hashMap    (0.75, 2)
2.hashMap    :
jdk1.7(  +  );jdk1.8(  +  +   )[         8 ,        ]
 
3.hashMap hashTable concurrentHashMap  
 a.      :
	hashMap     ,hashTable concurrentHashMap      。hashTable   synchronize;concurrentHashMap      (segments)
 b.   value   null
	hashTable value null      ;concurrentHashMap key value null      
	
4.  aop              
spring AOP  

         :

spring      



5.
   @ControllerAdvice & ExceptionHandler       
   @ControllerAdvice & ResponseBodyAdvice   Controller        ,       /   。
   @ControllerAdvice & RequestBodyAdvice   @RequestBody     。

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