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                            ### 定義注解

使用@interface定義注解（Annotation）。
![](http://blog.liufei1988.com/69fc6fb988536a1fac682023dd989c13)
使用元注解定義注解：

* @Target

![](http://blog.liufei1988.com/ae460901f3da3f51a65ae044914319cf)
* @Retention

![](http://blog.liufei1988.com/f5f863bac25ee85ce03ecde0045aed03)
* @Repeatable

![](http://blog.liufei1988.com/2e05bc8611fb1b619ec640bc28df07bf)
* @Inherited
![](http://blog.liufei1988.com/45502296b4325e85a63fd85593a41f4e)

定義Annotation的步驟：

1. 用@interface定義注解
2. 用元注解（meta annotation）配置注解
  * Target：必須設置
  * Retention：一般設置為RUNTIME
  * 通常不必寫@Inherited, @Repeatable等等
3. 定義注解參數和默認值

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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