Why init() destroy() cant be overridden in servlets

Why not? We can override these two methods also. We can override init method for connecting to the database or some other resources. The init method called by the container only once ,when the servlet has been loaded into the memory. You can override the destroy method to release the resources.

When we stopped our server the destroy method will call by the container. But the service method will call each and every time the request came. Profile Answers by Sandhya. We can override the init and destory methods in servelets. We can override the destroy method to release the resources.

With respective to this question, the destroy gets executed and then the servlet initialization gets completed. How are we doing? Please help us improve Stack Overflow. Take our short survey.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Shall we call the destroy method from the init and service methods in Servlet? Ask Question. Asked 10 years, 5 months ago. Active 2 years, 9 months ago. Viewed 6k times. Is the above understanding right? Add a comment. Active Oldest Votes. None of all is true.

BalusC BalusC 1. That is the ideal scenario with respect to the servlet life cycle. The init block is always called after the primary constructor. A class file can have one or more init blocks executing in series i. In Kotlin we use a single colon character : instead of the Java extends keyword to extend a class or implement an interface.

We can then create an object of type Programmer and call methods on it—either in its own class or the superclass base class. Kotlin provides the ability to extend a class with new functionality without having to inherit from the class or use design patterns such as Decorator. This is done via special declarations called extensions. Can We Override a Final Method? No, the Methods that are declared as final cannot be Overridden or hidden.

Methods are declared final in java to prevent subclasses from Overriding them and changing their behavior, the reason this works is discussed at the end of this article. Thus, these methods are defined for all Kotlin classes. If the derived class has a primary constructor, the base class can and must be initialized in that primary constructor according to its parameters.

To override method of a Super class, define a function in the Child class with same definition as that of in Super class. Overriding a method of Super class is useful, when you need to change the default behaviour. By default, all classes in Kotlin are final, which corresponds to Effective Java, 3rd Edition, Item Design and document for inheritance or else prohibit it. In Kotlin, all classes are final by default. To permit the derived class to inherit from the base class, we must use the open keyword in front of the base class.

Kotlin Inheriting property and methods from base class: When we inherit a class then all the properties and functions are also inherited. The class from which the features are inherited is known as base class or super class or parent class and the class that inherits the features is known as derived class or sub class or child class.

In this guide, we will learn what is inheritance and how to implement it in the Kotlin with the help of examples. So far, all classes were inherited using a primary constructor.

The super keyword will call the constructor of the super or parent class to initialize the properties of the parent class. Begin typing your search term above and press enter to search. Press ESC to cancel.