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Mastering Kotlin Essentials

Data Classes and Inner Classes

Explore how Kotlin uses data classes to reduce boilerplate compared to Java and understand the concept of inner classes, including how they can reference outer classes. This lesson helps you grasp efficient class design techniques essential for building clean and powerful Kotlin applications.

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Data classes in Kotlin and Java

When comparing classes defined in Kotlin and Java, we can see how much boilerplate code Kotlin has eliminated. In Java, to represent a simple User, with a name, surname, and age, the typical implementation looks as follows:

Java
public final class User {
    private final String name;
 
    private final String surname;
    private final int age;
    public User(
        String name,
        String surname,
        int age
    ) {
        this.name = name;
        this.surname = surname;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public String getSurname() {
        return surname;
    }
    public int getAge() {
        return age;
    }
}

In ...