具有接口的枚举类成员在内部找不到方法 [英] Enum class member with interface cannot find methods internally

问题描述

我有一个奇怪的问题，我不知道这是一个编译器问题，还是我对接口的枚举的理解。我正在使用IntelliJ IDEA 12，构建一个Android项目，我有一个这样的类：

  public class ClassWithEnum {
 private MyEnum myEnum; 
 
 //尝试在内部访问它会抛出错误
 public boolean isActionable（）{
 return myEnum.isActionable（）; 
} 
 
 public enum MyEnum实现Action {
 ACTIONABLE（）{
 @Override 
 public boolean isActionable（）{return true; 
}，
 NOT_ACTIONABLE（）{
 @Override 
 public boolean isActionable（）{return false; } 
} 
} 
 
 public interface Action {
 public boolean isActionable（）; 
} 
} 
  

现在，这是最初的工作，但现在编译器正在抱怨（我已经在一个全新的项目中尝试了相同的结果），错误：

  java ：/Users/kcoppock/Documents/Projects/EnumInterfaceTest/src/com/example/EnumInterfaceTest/ClassWithEnum.java:11：找不到符号
符号：方法isActionable（）
 location：class com.example。 EnumInterfaceTest.ClassWithEnum.MyEnum 
  

我以前做过这些（使用界面定义的行为枚举）没有问题。任何想法？

解决方案

您需要实现 isActionable（） MyEnum 本身。因为在 ACIONABLE 和 NOT_ACTIONABLE isActionable（） >是他们本地的。所以你需要一个全局的方法来为 MyEnum 枚举。

使用这个代码：

  public enum MyEnum implements Action {
 ACTIONABLE（）{
 @覆盖
 public boolean isActionable（）{return true; 
}，
 NOT_ACTIONABLE（）{
 @Override 
 public boolean isActionable（）{return false; } 
}; 
 @Override 
 public boolean isActionable（）{return false;} 
} 
  

I'm having a strange issue which I'm not sure if it's a compiler problem or my understanding of enums with interfaces. I'm using IntelliJ IDEA 12, building an Android project, and I have a class like this:

public class ClassWithEnum {
    private MyEnum myEnum;

    //Trying to access it internally here throws the error
    public boolean isActionable() {
        return myEnum.isActionable();
    }

    public enum MyEnum implements Action {
        ACTIONABLE() {
            @Override
            public boolean isActionable() { return true; }
        },
        NOT_ACTIONABLE() {
            @Override
            public boolean isActionable() { return false; }
        }
    }

    public interface Action {
        public boolean isActionable();
    }
}

Now, this was working initially, but now the compiler is complaining (and I've tried this in a brand new project as well with the same results) with the error:

java: /Users/kcoppock/Documents/Projects/EnumInterfaceTest/src/com/example/EnumInterfaceTest/ClassWithEnum.java:11: cannot find symbol
symbol  : method isActionable()
location: class com.example.EnumInterfaceTest.ClassWithEnum.MyEnum

I've done this before (enumerations with behaviors defined by an interface) with no issues. Any thoughts?

解决方案

You need to implement isActionable() method in MyEnum itself. Because the method isActionable() defined inside the ACIONABLE and NOT_ACTIONABLE are local to them . So you need the global method for the MyEnum enum .

use this code instead:

public enum MyEnum implements Action {
        ACTIONABLE() {
            @Override
            public boolean isActionable() { return true; }
        },
        NOT_ACTIONABLE() {
            @Override
            public boolean isActionable() { return false; }
        };
        @Override
        public boolean isActionable() { return false;}
    }

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