Class method Abstract Templates

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Commonly Asked Questions about Class method Abstract Templates

Can an abstract class have methods?

Abstract class in Java is similar to interface except that it can contain default method implementation. An abstract class can have an abstract method without body and it can have methods with implementation also. abstract keyword is used to create a abstract class and method.

Can an abstract class have a template?

The Abstract Class declares methods that act as steps of an algorithm, as well as the actual template method which calls these methods in a specific order. The steps may either be declared abstract or have some default implementation. Concrete Classes can override all of the steps, but not the template method itself.

How template method is different from abstract method?

A template method defines the steps of an algorithm, deferring to subclasses for the implementation of those steps. The Template Method Pattern gives us an important technique for code reuse. The template methods abstract class may define concrete methods, abstract methods and hooks.

What is the difference between template and abstract class in CPP?

The main difference is that abstract classes (run-time polymorphism) are a run-time mechanism, while templates are a compile-time mechanism. This means that by using abstract classes you can possibly change the behaviour at run-time (e.g, by loading a configuration file at run-time, or by means of plugins).

Can an abstract class have method bodies?

Abstract methods cannot have body. Abstract class can have static fields and static method, like other classes. An abstract class cannot be declared as final. Only abstract class can have abstract methods.

Do methods go in the abstract?

Methods. The methods section is usually the second-longest section in the abstract. It should contain enough information to enable the reader to understand what was done, and how.

What is the difference between template and abstract class?

I know that template classes are instantiated the same way as the functions. A copy is created with the template parameters replaced with actual data types. Abstract classes have pure virtual functions and cannot be instantiated. Derived classes must define the virtual functions.

Can abstract classes have main methods?

Yes, you can use the main() method in abstract class. The main() method is a static method so it is associated with Class, not with object or instance. The abstract is applicable to the object so there is no problem if it contains the main method.

What is not allowed in abstract class?

Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class. However, if it does not, then the subclass must also be declared abstract .

Can a subclass of an abstract class have its own methods?

In doing so, each subclass is free to give its own implementation of the abstract method. Note: If a class contains abstract methods, then the class should also be declared as abstract. Else it will not get compiled by JVM.