Android developers know that the main languages which are used to develop Android applications are Java and Kotlin languages. But, after Kotlin’s first stable release on 15 February 2016, developers started to adapt Kotlin for Android application development. Also, in May 2017 Google announced that Kotlin is Google’s preferred language for Android application developers. So lets have a look on both languages Kotlin vs java and Which One Is Better? and compare Kotlin vs Java performance.
James Gosling at Sun Microsystems originally developed Java language. It first released in 1995. Java is a class-based, general purpose object oriented language. Java code runs on any platform that supports Java. It does not need any recompilation.
Kotlin is a statically typed programming language. Because it is a general purpose programming language. It is completely interoperable with Java and JVM. It is designed in such a way that not only it is interoperable with Java but also help developers in migrating from Java to Kotlin.
Which Language is Better? Java or Kotlin:
Java is considered as one of the best language for developers. It has a huge number of developers as well. In 2019 there were around 8 million developers using Java as a main language. But, no doubt there are a lot of things that Java does not offer but Kotlin does. Here is a quick comparison between both languages.
Code conciseness is a main feature in Kotlin. If we compare a Java class with a Kotlin class then we find that Kotlin reduces amount of code. That means a 10 line Java code becomes a 4 to 5 lines code in Kotlin.
The main thing is Java needs a reference of the view into the Activity using findViewbyId() method. Due to the Kotlin’s Android Extension we do not need to import the reference of the View into the Activity file. It allows working with Views as they are part of the same Activity.
In projects developers use a lot of classes that hold data. So it needs to write a lot of code in Java. It needs constructor, fields then setter and getter for every field and other related functions. Kotlin deals these classes very smartly. The only thing you have to do is to add the “data” keyword before the class name. So compiler will handle other things on its own.
Checked exception feature can create many problems for developers. This happens when the caller of any function is forced by the compiler to catch or re-throw an exception. They cause empty catch blocks and unnecessary exceptions most of the time. Empty catch blocks are a real trouble maker for developers because developers need to check the entire code to identify a nonexistent exception. Kotlin reacts here smartly and entirely remove these exceptions. It saves code from errors and helps improving type-safety.
Android is single threaded by default. If the main thread is blocked then it freezes the UI. To run long-running operations in Java we create a background thread. But, the problem is when more than one thread works it may lead to errors in the code.
In Kotlin we can create additional threads as well. But, we can handle them with a better approach called Coroutines. Coroutines use less memory compared to threads. Coroutines can perform long running and intensive tasks.
A billion dollar mistake in Java, that is it does not provide Null safety. Because of that NullPointerExceptions occur. In Java you can assign a null value to any type of variable. And when a developer uses an object reference that has a null value then NullPointerException comes.
In Kotlin if a developer gives Null as a value. It will generate a compiler error. In Kotlin all the types are by default non-nullable. To assign a null value to a variable in Kotlin we need to mark the variable as nullable. This needs a ‘ ? ‘ after the type of that variable. Like this:
val age: Int? = null
This leads to no NullPointerException.
Kotlin constructor use is simple and basic. In Kotlin a class can have one or more than one secondary constructors. Along with the primary constructor. Just In the class declaration we have to add these secondary constructors.
Kotlin has a feature called smart casts. Smart casts automatically handles the redundant casts.
Kotlin vs Java which one is better this question is still debatable. A huge number of developers are still using Java for android development. But for sure number of Kotlin developers is increasing day by day.
If we talk about Kotlin vs Java syntax then it doesn’t make a big difference. In my opinion Java programmers can easily migrate to Kotlin without any difficulty.
In my opinion Kotlin is better than Java because it has some great features that Java doesn’t provide. Such as Null Safety and Code conciseness. Another advantage is that Kotlin was designed to fulfill those requirements that previously developed languages like Java didn’t have. But both languages have their advantage over the other.
People also read: