public abstract class AbstractClass {
	
	public abstract String getSubClassFullName();
	
	public void storeToDatabase() {
		String primaryKey = getSubClassFullName();
		//Entity entity = new Entity(primaryKey )
		//databaseEngine.store(entity)
	}
}

class Sub1Class extends AbstractClass  {

	@Override
	public String getSubClassFullName() {
		return Sub1Class.class.getName();
	}	
}

class Sub2Class extends AbstractClass  {

	@Override
	public String getSubClassFullName() {
		return Sub2Class.class.getName();
	}	
}

public void storeToDatabase() {
		String primaryKey = getClass().getName();
		
	}