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.
While it is not required to use this annotation when overriding a method, it helps to prevent errors. If a method marked with @Override fails to correctly override a method in one of its superclasses, the compiler generates an error.
The @Override annotation is one of a default Java annotation and it can be introduced in Java 1.5 Version. The @Override annotation indicates that the child class method is over-writing its base class method.
In Java, annotations are the metadata that we used to provide information to the compiler. Here, the @Override annotation specifies the compiler that the method after this annotation overrides the method of the superclass. It is not mandatory to use @Override .
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:
Do you use JDK5? As I have in mind is that , it's a bug in JDK5. @override is not allowed in implemention of interface in JDK5
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