why enum could not be resolved in JAVA?

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开发者_运维问答
 - '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?

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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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• the first compiles fine. Check your compiler level (should be at least 1.5)
• inteRface
• you cannot put code in the method body, as you did in ClassC. It should be in a method or in a block

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You mistyped inteface for interface.

Maybe your compiler is too old, so that it doesn't know that enum is a keyword.

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You must write code either in a method or in a static block (assigning static values). Your System.out.println() is written into a class. Create method and put System.out.println() there.