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How do you override an abstract class method?
A non-abstract child class of an abstract parent class must override each of the abstract methods of its parent. A non-abstract child must override each abstract method inherited from its parent by defining a method with the same signature and same return type. Objects of the child class will include this method.
Can a class extend an abstract class?
An abstract class can extend another abstract class. And any concrete subclasses must ensure that all abstract methods are implemented. Abstract classes can themselves have concrete implementations of methods.
What are the restrictions to classes that extend abstract class?
1) Abstract method has no body. 2) Always end the declaration with a semicolon(;). 3) It must be overridden. An abstract class must be extended and in a same way abstract method must be overridden.
Can abstract class be empty?
The key is that you can extend from only one abstract class, while you can implement more interfaces. Apparently the “empty abstract class” design desicion was made so that it prevents the implementing class from extending from another classes.
How to optional Override method in abstract class?
The implementation of the non-implemented method will be the job of the first deeper concrete subclass. So for your problem, you eventually could use composition over inheritance adding the collaborator (containing your new common method) as a protected field of your base class.
Can a class have more than one abstract method?
If a class has one or more abstract methods it must be declared to be abstract. An abstract class may have methods that are not abstract (the usual sort of method). These methods are inherited by child classes in the usual way.
Is there a way to override the generated classes?
Ordinarily, this means that you cannot override them; you cannot override in one partial class the methods that are defined in another partial definition of the same class. Nevertheless, you can override these methods by setting the Generates Double Derived flag for the domain class.
Can a subclass override a parent class in apex?
// Because it is declared virtual it can be overridden by a subclass. // Implementation of the second interface method above. // Abstract class (that subclasses the class above). No constructor is needed since // Override the parent class method with this signature. // Same name as parent class method, but different signature.