Secondary constructor works, like in Java, without any difference. In Java, when we need to check variable for null, we usually write block. It’s time to tell you how null-safety in Kotlin works. Kotlin also allows you to declare immutable objects with keyword ‘val’. Var implicitName = "Kotlin" // In that case we declare a variable implicitly var explicitName : String = "Kotlin" // Here we declare the type Let’s see how the declaration of variables looks. Starting to develop an Android application on Kotlin is not very difficult. Many of these features have appeared only in the latest versions of Java but were implemented by Kotlin creators. They provided a solution of so-called ‘one billion problem’: null by default. Kotlin creators wanted to invent null-safety language that could be more flexible and friendlier than Java. These guys dreamed about removing those restrictions which are imposed on developers in Java 6: no streams, no lambda functions, no try-with-resources and etc. Kotlin in Action, Second Edition teaches you Kotlin techniques you can use for almost any type of application, from enterprise services to Android apps.
Why Kotlin was created and by whomĬreating of language began in 2010 at JetBrains by two talented programmers – Andrew Breslav and Dmitry Zhemerov.
Let’s look at the history of that language, sort out the pros and cons of the language, as well as a look at an example and how you can start using Kotlin for Android development. It is a modern, statically-typed language aimed at trying to make the code simpler and clearer for everyone and bring long-awaited Java features to Android developers. Some people seriously considered it as a full-fledged replacement of Java in Android development. Kotlin programming language now on everyone’s lips.
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