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Kotlin Compact

Classes and Objects (part-II)

Explore Kotlin's data classes that automatically generate equals, hashCode, and toString methods to simplify data handling. Understand how init blocks allow complex code during object initialization and how secondary constructors provide multiple ways to create instances.

We'll cover the following...

The data classes

We can take this one step further by writing the keyword, data, before the compact class:

Kotlin 1.5
data class Person(val firstName: String, val lastName: String)

With this minimal addition, we have created a data class. This is extremely useful for classes whose primary task is that of a data container.

Data classes have a lot of useful features for this purpose. One of these, however, is a real relief for Java developers. The Kotlin compiler automatically ...