Won't let me override interface method

Question

I have an interface which has a OnTaskComplete which takes in a string method and within my class I have

public class JSONActivity extends Activity implements OnRetrieveHttpData

OnRetrieveHttpData being my interface however when I try to override it, it comes back with an error saying

The method onTaskCompleted(String) of type JSONActivity must override a superclass method

here is the code within my class

public class JSONActivity extends Activity implements OnRetrieveHttpData {
 @Override
 public void onCreate(Bundle savedInstanceState){
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_json);
 }

 @Override
public void onTaskCompleted(String twitterData) {
    // TODO Auto-generated method stub
}

}

and here is my code within the interface

public interface OnRetrieveHttpData {
    void onTaskCompleted(String twitterData);
}

The error suggests that the signatures in the interface and your class aren't *exactly* the same. — duffymo, Apr 26 '13 at 11:32
@BenGreen methods starting with lower-case conform to Java coding style standard, so I highly doubt this is the reason. It would be weird if it started with an upper-case letter. — m0skit0, Apr 26 '13 at 11:34
@m0skit0 Sorry for the confusion. I am aware that this is convention, I was just trying to point out that according to the question, the method has an uppercase O in the interface and in the concrete implementation it is lower case. — Ben Green, Apr 26 '13 at 11:36

score 7 · Accepted Answer · answered Apr 26 '13 at 11:33

7

You are using jdk1.5, switch over to jdk 1.6.

In 1.5 you can't use @override for interface methods while in 1.6 you can. This is the issue you are facing.

answered Apr 26 '13 at 11:33

Lokesh

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Also you cant change the visibility modifiers. – Sri Harsha Chilakapati Apr 26 '13 at 11:36
how do you switch over to jdk 1.6? – DorkMonstuh Apr 26 '13 at 11:36
Download jdk 1.6 setup :). And compile and run your code against jdk1.6. – Lokesh Apr 26 '13 at 11:37
ahh how do you check which JDK you have? – DorkMonstuh Apr 26 '13 at 11:40
See also http://stackoverflow.com/questions/987973/why-does-eclipse-complain-about-override-on-interface-methods – Raedwald Apr 26 '13 at 11:42
I just checked in Eclipse that my JDK is 1.7 – DorkMonstuh Apr 26 '13 at 11:44
@DorkMonstuh Your project must also be configured to use Java 1.6+ syntax. – Dave Newton Apr 26 '13 at 11:47
I downvoted but only because I read too quickly and did not see "for interface methods". This answer is correct. – Étienne Miret Apr 26 '13 at 11:49
@DaveNewton How do you do that? – DorkMonstuh Apr 26 '13 at 11:50
@DorkMonstuh right-clic your project, select "properties", and check "Java Compiler" and "Java Build Path". – Étienne Miret Apr 26 '13 at 11:55

Won't let me override interface method

1 Answers1