好方法在服務組件訪問靜態變量現在

Question

public interface ABCHelper { 
     ... 
     ... 
    } 

    @Service(ABCHelper.class) 
    @Component(immediate = true, metatype = true) 
    public class ABCHelperImpl implements ABCHelper { 
     private static String DEMO = "demo"; 
     ... 
     ... 
    } 


@Service(XYZ.class) 
    @Component(immediate = true, metatype = true) 
    public class XYZHelperImpl implements XYZHelper { 
     @Reference private ABCHelper abcHelper; 
     ... 
     ... 
    } 

獲得在XYZHelper，下面的方法，這是很好DEMO變量的值：

方法1：製作DEMO變量作爲公衆，然後訪問它如下：

@Service(XYZ.class) 
     @Component(immediate = true, metatype = true) 
     public class XYZHelperImpl implements XYZHelper { 
      @Reference private ABCHelper abcHelper; 
      ... 
      ... 
      void f() { 
      String s = ABCHelperImpl.DEMO ; 
      } 
    } 

方法2：定義在ABCHelperImpl靜態方法，然後如下面接近它：

@Service(ABCHelper.class) 
    @Component(immediate = true, metatype = true) 
    public class ABCHelperImpl implements ABCHelper { 
     private static String DEMO = "demo"; 
     ... 
     ... 
    public static String getDemo() { 
    return DEMO; 
    } 
} 

@Service(XYZ.class) 
    @Component(immediate = true, metatype = true) 
    public class XYZHelperImpl implements XYZHelper { 
     @Reference private ABCHelper abcHelper; 
     ... 
     ... 
     void f() { 
     String s = ABCHelperImpl.getDemo() ; 
     } 
} 

方法3：

public interface ABCHelper { 
     ... 
     ... 
     public String getDemo(); 
    } 

    @Service(ABCHelper.class) 
    @Component(immediate = true, metatype = true) 
    public class ABCHelperImpl implements ABCHelper { 
     private static String DEMO = "demo"; 
     ... 
     ... 
    public static String getDemo() { 
    return DEMO; 
    } 
} 

@Service(XYZ.class) 
    @Component(immediate = true, metatype = true) 
    public class XYZHelperImpl implements XYZHelper { 
     @Reference private ABCHelper abcHelper; 
     ... 
     ... 
     void f() { 
     String s = abcHelper.getDemo() ; 
     } 
} 

Answer 1

我認爲最好的辦法將是這個變量移動到一些Constants 類做public到處都需要使用它。