What are abstract classes and interfaces in TypeScript?Blueprints for subclasses that cannot be instantiated directlyClasses that can be instantiatedClasses that cannot be inheritedClasses that provide complete implementation
Question
What are abstract classes and interfaces in TypeScript?Blueprints for subclasses that cannot be instantiated directlyClasses that can be instantiatedClasses that cannot be inheritedClasses that provide complete implementation
Solution
Abstract classes and interfaces in TypeScript are blueprints for subclasses that cannot be instantiated directly. They are not classes that can be instantiated, nor are they classes that cannot be inherited. They also do not provide a complete implementation.
Abstract classes in TypeScript are base classes from which other classes may be derived. They may not be instantiated directly. Instead, they must be extended from. An abstract class typically includes one or more abstract methods or property declarations. The class which extends the abstract class must define all the abstract methods.
On the other hand, an interface is a structure that defines the contract in your application. It defines the syntax for classes to follow. Classes that are derived from an interface must follow the structure provided by their interface. The TypeScript compiler does not convert interface to JavaScript. It uses interface for type checking. This is also known as "duck typing" or "structural subtyping".
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Select the correct statements on differences of abstract classes and interfacesSelect one or more:interface is better suited for Type declaration and abstract class is more suited for code reuse and evolution perspective.you can extend only one abstract classyou can create a non-abstract method in abstract classyou can implement multiple inheritance in Java.you can create a non-abstract method in an interface
Stat A) An abstract class is a class which contains some abstract methods as well as concrete methods also. Stat B) Consider that class that contains only abstract methods, and there are no concrete methods. It becomes an abstract class. Stat C) This means an interface is an abstract class but it contains only abstract methods. None of the methods in interface can be defined. Stat D) Only method names or headers can be written in interface. So that an interface can be defined as a specification of method headers.ABCD TrueACD TrueBCD TrueAD True
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