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Forcing subclasses of my class to override only certain functions in Java
public class GeneralClass<T> {
    methodA() {...}
    methodB() {...}
    methodC() {...}
}

public class MoreSpecificClassString extends GeneralClass<String> {
    methodD() {...}
    methodE() {...}
    methodF() {...}
}

public class MoreSpecificClassInt extends GeneralClass<Integer> {
    methodX() {...}
    methodY() {...}
    methodZ() {...}
}

@Override
public void methodA() {
    super.methodA();
}

abstract class ABC {
  abstract int methodA();
  final int methodB() { ... implementation ...}
}