In this tutorial, you’ll use Spring Boot for the API that powers your Android (+ Kotlin) mobile app. The best way to start is by creating a complete app yourself, which you’ll do in this tutorial. Code Reusability: Abstract classes provide a way to reuse code by allowing multiple classes to extend the same abstract class and share the same abstract methods and properties.Kotlin was recently given official Android support status by Google, but it remains difficult to understand for many developers.Polymorphism: Abstract classes allow you to create objects of different types that have the same interface, which enables polymorphic behavior.This enables you to create abstractions that improve the modularity and maintainability of your code. Abstraction: Abstract classes provide a way to define a common contract between different classes without specifying the implementation details.Kotlin program of overriding a non-abstract open function by an abstract class –ĭivision of two numbers 3 Advantages of using abstract classes in Kotlin: In Kotlin we can override the non-abstract open member function of the open class using the override keyword followed by an abstract in the abstract class. Overriding a non-abstract open member with an abstract one – It overrides the abstract fun of Employee class and prints the value of passed as parameter to the standard output. In the end, dateOfBirth() is called using the eng object and we have passed the parameter date to the primary constructor. It will print the values of name, experience and the overridden salary of the employee.

The Then employeeDetails() method is called using the eng object. This initializes the non-abstract properties name and experienceof Employee class. We have passed two parameters to the primary constructor while creating it. An object eng is instantiated for the Engineer class. ISRO CS Syllabus for Scientist/Engineer ExamĮxplanation: In the above program, Engineer class is derived from the Employee class.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.DevOps Engineering - Planning to Production.

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