Integers are represented by types such as Byte, Short, Int, and Long. Numbers in Kotlin come in two forms: Integers and Floating-point numbers. These different types are very neatly organized in a hierarchy that we'll take a look at after we understand nullable types. These basic types include numbers, characters, and booleans. In Kotlin, several basic types are available to use when declaring variables and constants. Simply put, a type is a category of data that a variable or expression can hold. The data type is one of the most fundamental concepts in any programming language. With the introduction out of the way, let's get started! Basic Types Hence, the compiler can track values which can be null and warn you if you're trying to access nullable value, preventing an NullPointerException from happening. It makes a clear distinction between references that can hold null values (nullable references) and those that cannot (non-null references). The type system of Kotlin is designed to provide an effective way to manage null references. But don't worry, Kotlin offers a solution for this. According to a survey, NullPointerException is the most common exception in java applications. Accessing a type that can be null can result in a null reference exception, commonly known as a NullPointerException. Coming to the second part of our article, we'll discuss why we need to be concerned with null safety. In programming, a type system is a set of rules that determine how data is stored, modified, and used. In this article, we're going to dive deep into Kotlin's type system and learn all about null safety.įirst, let's define what a type system is. In the previous articles, we covered some basics of Kotlin and OOPS. Welcome to the fourth article in this series on Android Development.
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