var a: String? = 'abc' // can be set null a = null // value set to null val l = if (a != null) a. To avoid this error we have to check if b is null and handle two cases in a respective manner. To allow nulls, we have to declare a variable as a nullable string, which can be done by adding a “?” to the data type i.e, “String? ”.The nullable counterpart of some type A is denoted as A? var a: String? = 'abc' // this is a nullable string b = null // value is set to null print(a) // null printedīut in this case, there are chances of NPE error when a method or property is accessed. In Kotlin a normal data type like string cannot store a null value and trying to do so will cause an error. Normal types, like String, are not nullable.

This is done to eliminate the NullPointerException error in the code which is common in other programming languages like Java.

we also discuss about nullable type wish example and non-nullable without example and see what is the common way to handle null pointer exception.In Kotlin by default, the data types are of non-nullable types i.e trying to assign a value as null would cause an error. Example fun main(args: Array) ) and implemented with a an example see the result after compile. If the variable is null it will simply return null otherwise perform action. We have to add question mar at the end of the datatype. Use it only if you don’t mind getting the null value in the output console. Nullable data types are also the same as Normal datatypes but these will accept the null values as well. So how to assign the null value to our variable of name so for that in kotlin we have something called nullable datatype to do that we have to make this string as nullable by using the question mark here so this rectify is our error now similar to string you can create an allowable integer or a nullable float value similarly nullable boolean value and0 even the custom classes such as student or employee so right now I will use the nullable string value now let us try to explode our null safety operators so here these are the comment statements where we will explore all the full types of null safety operators

There are four types of null safety operators. In kotlin by default the null value is not supported to avoids the null pointer exception we have a lot of null safety operators which helps to avoid the null pointer exception and makes our application more robust and errors.

Kotlin nullable types