interface Data {
public void load();
}
abstract class Info {
public abstract void load();
}

public class Employee extends Info implements Data {
public void load (){
System.out.println ("loading");
/*do something*/
}
}

Why this code is correct ? Is it is not compulsory to deine the method declared in interface by the class which implements that interface ??

Congratulations on a really interesting question!
I think the answer is that the load() method (line 9) satisfies both the requirements of the interface and the abstract superclass, so that's OK.

indeed. same signature, same name ...
I can't think of a single reason why the code shouldn't compile.

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