Question

I’m writing a Java class that’s implementing an interface called Command, which contains the methods isValid() and run(), as follows:

public class DailyEnergy implements Command {

  @Override
  public boolean isValid(String command) {
    return false;
  }

  @Override
  public void run(String command) throws Exception {
  }
}

and here’s the Command.java file:

public interface Command {

  public boolean isValid(String command);
  public void run(String command) throws Exception;
}

Within this class, I’m implementing the superclass methods isValid() and run(), and I want to add the @Override annotation, but Eclipse gives an error saying that “the methods must override superclass methods”.

Even when I take out the methods and import them automatically with Eclipse, if I add the annotation, I get the error. If anyone can shed some light as to why I can’t use the @Override annotation, that would be greatly appreciated.

Answer 1

The @Override annotation on interface implementations is supported since Java-6. Are you possibly on Java-5? Oracle has acknowledged a mess-up in the Java 6 docs. It has been corrected in Java-7. See example below: