ImplicitInterfaceImplementation
DRAFT
Observed

ImplicitInterfaceImplementation
Incorrect

Java implicitly produces implementations of any methods a class inherits from the interfaces it implements

Correct

Java does not implicitly produce implementations of any methods a class inherits from the interfaces it implements

Correction
Here is what's right.

The word “implements” means that we, the author of the class, have to provide those implementations.

interface I {
  public abstract void m1();
  public abstract void m2();
}
class C implements I {
}

The above code won’t compile. We have to provide the implementations ourselves:

interface I {
  public abstract void m1();
  public abstract void m2();
}
class C implements I {
  public void m1() { /* our implementation */ }
  public void m2() { /* our implementation */ }
}