@Override编译错误，实现接口（Eclipse JRE7 Windows）

Question

I am getting compile errors in eclipse when using the @Override annotation for a class that is implementing an interface.

JDK compliance level is set to 1.7.

I am using the latest version of the jdk7.

Error: "The method {methodname} of type {classname} must override a superclass method"

 public interface DataDictionary { public Map<String, ? > getAllEntries(String dictionaryName); ... ... } public class StringDictionary implements DataDictionary { @Override // this generates the error public Map<String, ?> getAllEntries(String dictionaryName) { // some implementation return dataDictEntries; } 

Answer 1

If you are using eclipse then remove the method deceleration in your subclass(StringDictionary ) then compiler will ask you to implement unimplemented method in super class. then with the help of eclipse you use option Add unimplemented method .

Hope so it will solve your problem.

Answer 2

I've tried exactly your code - no problem at all. JDK1.6 should be sufficient, as @Override for interfaces was added in JDK1.6. From all I can see in the question, your code is correct and should work fine.

I suggest things like restart Eclipse or change the method then change it back, it seems something inside Eclipse got out of sync with your code.

Answer 3

另一个建议是，删除eclipse为您生成的类文件，对文件进行一些编辑（如注释），保存并让eclipse重新为您构建。

Answer 4

I think have solved it. Earlier I was only modifying the workspace properties only but using maven project with SVN. Maven was internally setting property of each project to use "Project Specific 1.5 java compliance" at each update.

I changed each project to use workspace JDK compliance and removed project specific settings in SVN projects to prevent from future errors after code update.

Thanks.