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The question is which is better Kotlin or Java. With the appearance of Kotlin this struggle started in 2011, when at the same time, Java was completely beating any new competitors off. With the help of Google and JetBrains, Kotlin was developed to eliminate any of Java’s faults. Beginning with the Google I/O 2017 Developer Conference, Kotlin started to move into a high level. Android and Java have always been connected. Android SDK is even written in Java. The situation has started to change after the invention of Kotlin. Below you will read about the differences between Kotlin vs. Java in order to understand if adopting Kotlin is worthwhile. Java vs. Kotlin: Advantages of Java If we look at Java and Kotlin, we will see that both languages have positive characteristics worth considering when choosing between them. The advantages of Java are: Easy to learn Strong community Platform-independent Java vs. Kotlin: Downsides of Java Just like any other programming language, Java has its disadvantages like: Verbosity Performance Nullability Problems It may seem that making Android apps with Java is a dead-end job if we take into account all of this. If you want to know more about it, below you will find it out. Recommendation: Why Use Java in 2019? After everything mentioned above Kotlin looks like the perfect language to develop with. Why is Java still used today? Read on to find out: There are Java gurus in a team who don't want to switch to Kotlin. A team tried Kotlin and was unsatisfied with it. If a successful project was developed in Java (although, it is not a problem to develop new features in Kotlin, in this case). Don't forget that Java code needs to be supported by Java if you don’t want the transition of the whole project to Kotlin. Kotlin: New Android Language Kotlin offers new capabilities for Android development. It compiles with JVM bytecode and can easily be used without dropping off or having to rewrite the whole project. Kotlin vs. Java: Advantages of Kotlin In spite of the fact that Kotlin is a new language, it has already shown a lot of benefits in comparison with Java. Below you will read the advantages of Kotlin: Conciseness Interoperability Functional programming support Fail-fast system Supportive community Kotlin vs. Java: Weak Points of Kotlin Every language has its advantages and disadvantages just like Kotlin, which also has some weak points. Slow compilation Lack of resources New Kotlin Features in Android Development Kotlin has new features that make Android programming even easier and more sufficient. Null-safety through nullable and non-nullable types, safe calls and safe casts Extension functions Higher-order functions Data classes Immutability Type aliases (added on Kotlin 1.1) As you know, Java has been one of the first-choices and recommended languages for developing Android apps for years. However, with the appearance of Kotlin, it has slowly but constantly given up this place. Kotlin appeared from industry needs, and its syntax and structure were sparked by Java and such popular languages as Scala and C#. It was created to be easy to dive into and to master. Google and JetBrains are promoting Kotlin actively, so it is not a surprise that more and more companies have declared their usage of Kotlin in public. Every day new libraries and code examples appear. The comparison of Kotlin vs. Java proved that Kotlin is more secure, more flexible, it provides more possibilities that help to reduce the number of lines written and, thus, fewer bugs and errors occur. I suggest you should take a look at this article https://mlsdev.com/blog/kotlin-vs-java to find out more about the differences between Kotlin and Java, and learn which language is better for Android development.