Mastering Kotlin Essentials/

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Data Classes and Inner Classes

Data Classes and Inner Classes

Learn about data class definitions and inner classes.

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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:

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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;
    }
}
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