October 2018
Intermediate to advanced
370 pages
9h 15m
English
Content preview from Hands-On Object-Oriented Programming with Kotlin
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Null safety
Nullability is one of the reasons that most applications crash. Kotlin is very strict when it comes to safety. Every application user (especially mobile users) want a nice, simple, and smooth user experience. An application that crashes makes more than 90% of users frustrated, causing them to instantly uninstall the application.
See the following example of Java. Here, the variable name is assigned a null value, which is the correct syntax in Java:
String name = null; // OK in javaint length = name.length(); // application crashed
But when name.length will be executed, Java will throw NullPointerException. In Kotlin, it is very important to note that variables are non-nullable by default and we cannot assign null values to them. ...
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