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WOW! Data Classes are awesome! I really like a lot of how classes are handled in Kotlin, but Data Classes are the pinnacle of that work. The effort for this Koan is to convert this Java class to Kotlin:
- package i_introduction._6_Data_Classes;
- import util.JavaCode;
- public class JavaCode6 extends JavaCode {
- public static class Person {
- private final String name;
- private final int age;
- public Person(String name, int age) {
- this.name = name;
- this.age = age;
- }
- public String getName() {
- return name;
- }
- public int getAge() {
- return age;
- }
- }
- }
and what does that look like in Kotlin?
Yup, a single line. The data annotation adds a number of important functions (like ToString
and copy
). We then declare the class with a constructor which takes two parameters which both become properties.
Another important aspect I learnt with this one is that Kotlin has both a val
and var
keyword for variables. We have seen var
already and val
is for read-only variables.