Creating DTOs POJOsPOCOs

Data classes in kotlin are classes created to do nothing but hold data. Such classes are marked as data:

data class User(var firstname: String, var lastname: String, var age: Int)

The code above creates a User class with the following automatically generated:

• Getters and Setters for all properties (getters only for vals)
• equals()
• hashcode()
• toString()
• copy()
• componentN() (where N is the corresponding property in order of declaration)

Just as with a function, default values can also be specified:

data class User(var firstname: String = "Joe", var lastname: String = "Bloggs", var age: Int = 20)

More details can be found here Data Classes.