Mastering Kotlin

Using existing code

We can easily instantiate and manipulate Java classes from Kotlin. Let's revisit the Programmer class written in Java:

public class Programmer extends Person {    private String preferredLanguage;    public Programmer(String firstName, String lastName,                       String preferredLanguage) {        super(firstName, lastName);        this.preferredLanguage = preferredLanguage;    }    public String getPreferredLanguage() {        return preferredLanguage;    }}

We can instantiate this from Kotlin like so:

val programmer = Programmer("John", "Smith", "Kotlin")

An interesting side effect of using a Java class from Kotlin is that we can take advantage of property access syntax to access fields exposed via getters/setters without having to actually call the getters and ...