为什么枚举在JAVA中无法解决？ [英] why enum could not be resolved in JAVA?

问题描述

我正在使用J2EE Eclipse Indigo，我有三个类声明如下：

  public interface ClassA {
 public static enum TYPE {TYPE1，TYPE2}; 
} 
 
 public interface ClassB扩展ClassA {
 
} 
 
 public class ClassC实现ClassB {
 System.out。的println（TYPE.TYPE1）; 
} 
  

ClassC中的TYPE上有一个编译错误。它抱怨枚举不能解决一个类型。还有一个在ClassA中枚举的警告，它抱怨说：

 此行上的多个标记
  - 'enum'不应该用作标识符，因为它是
上的源级别1.5的保留关键字 - 枚举不能解析为类型
  - 语法错误，插入;完成FieldDeclaration 
  

我可以知道这段代码中的错误是什么？

解决方案

我有一个类似的问题：

枚举不能解决一个类型

Eclipse提供导入枚举 p>

我去了

• 首选项 - > Java-> Installed_JREs-> Execution_environment;


• 在执行环境窗格中选择JavaSE-1.6;和


• 在兼容JREs 窗格中选中jre6。

重建后枚举被正确识别。

I was using J2EE Eclipse Indigo, and I have three class declare like this:

public interface ClassA {
   public static enum TYPE { TYPE1, TYPE2 };
}

public interface ClassB extends ClassA {

}

public class ClassC implements ClassB {
   System.out.println(TYPE.TYPE1);
}

There was a compilation error on TYPE in ClassC. It complain that "enum cannot be resolved to a type". And also a warning for enum in ClassA, it complain that:

Multiple markers at this line
 - 'enum' should not be used as an identifier, since it is a reserved keyword from source level 1.5 on
 - enum cannot be resolved to a type
 - Syntax error, insert ";" to complete FieldDeclaration

May I know what cause the error in this code?

解决方案

I had a similar problem:

enum can't be resolved to a type

Eclipse offered to import Enum instead.

I went to

• Preferences->Java->Installed_JREs->Execution_environment;
• Selected JavaSE-1.6 in "Execution Environments" pane; and
• Checked jre6 in Compatible JREs pane.

After rebuild enum was recognized properly.

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