jamesmporter

public class Calculator {
    public static double calculate (double a, String op, double b) throws Exception {
        switch (op) {
            case "plus":
                return a+b;
            case "minus":
                return a-b;
            case "div":
                return a/b;
            case "times":

jamesmporter

public class Person {
    private String name;
    private String email;
    private int age;

    public Person(String name, String email, int age) {
        this.name = name;
        this.email = email;
        this.age = age;
    }

jamesmporter

mLiveData.observe(this, Observer {
    when (it) {
        0 -> zero()
        1 -> one()
        null -> mLiveData.postValue(0)  //Initialise
        else -> many()
    }
})