Can not compile enums in Eclipse

Question

While trying to introduce enums in my Android project in Eclipse, I encountered with the following problem: Compiler says:

1. The type java.lang.Enum cannot be re

Answer 1

Close project the project with the error.

Open a different project and launch in emulator. Close the alternative project.

Open the original project with the error which should no longer be evidenced.

Don't know why it works or if actually launching the app is necessary but it clears the error .

Answer 2

1. Go to properties of project with the build error (right click > Properties)
2. View the "Libraries" tab in the "Build Path" section
3. Find the "JRE System Library" in the list (if this is missing then this error message is not an eclipse bug but a mis-configured project)
4. Remove the "JRE System Library"
5. Hit "Add Library ...", Select "JRE System Library" and add the appropriate JRE for the project (eg. 'Workspace default JRE')
6. Hit "Finish" in the library selection and "OK" in the project properties and then wait for the re-build of the project

Hopefully the error will be resolved ...

Answer 3

Open the properties for the project, select the page "Java Compiler" and set the "Compiler Compliance level" to "1.5" or better.