Kotlin vs. Java | What is the difference between Kotlin and Java | 2021

In this tutorial, we’re going to discuss the main difference between Kotlin and Java. But before discussing the Kotlin and Java difference, let’s first learn “What is Kotlin?” and “What is Java?”.

What is Kotlin?

What is Java?

Difference between the Java and Kotlin

Null Safe

In Kotlin, By default, all types of variables are non-nullable (i.e. we can’t assign null values to any type of variables/objects). If we try to assign or return null values, the Kotlin code will fail during compile-time. If we really want a variable to have a null value, we can declare as follows: value num: Int? = null

Extension Function

Kotlin provides developers the ability to extend an existing class with new functionality. We can create extend functions by prefixing the name of a class to name of the new function.

Coroutines Support

In Kotlin, We can create multiple threads to run these long-running intensive operations but we have coroutines support, which will suspend execution at a certain point without blocking threads while executing long-running intensive operations.

No checked exceptions

In Kotlin, we don’t have checked exceptions. So developers don’t need to declare or catch the exceptions, which have advantages and disadvantages

Data classes

In Kotlin, If we need to have classes which need to hold data we can declare a class with keyword “data” in the class definition then the compiler will take care of all of this work such as creating constructors, getter, setter methods for different fields.

Smart casts

In Kotlin, smart casts will handle these casting checks with keyword “is-checks” which will check for immutable values and performs implicit casting.

Type inference

In Kotlin, we don’t need to specify the type of each variable explicitly based on assignment it will handle. If we want to specify explicitly we can do.

Functional Programming

Kotlin is a mix of procedural and functional programming language which consists of many useful methods such as lambda, operator overloading, higher-order functions, and lazy evaluation, etc.

So, which is better?

  • Although Java is still an essential language for every android app development as the Android OS itself is based on the same.
  • If you are looking to future-proof your android app development services, then you should hire Kotlin developers for the same.

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Hi everyone, myself Golap an Android app developer with UI/UX designer.