import java.util.Calendar;

public class Main {
    public static void main(String[] args) {
        int i = 2;
        System.out.print("Write " + i + " as ");
        switch (i) {
            case 1:
                System.out.println("one");
                break;
            case 2:
                System.out.println("two");
                break;
            case 3:
                System.out.println("three");
                break;
        }

        // You can use commas to separate multiple expressions in the same case statement.
        Calendar calendar = Calendar.getInstance();
        int day = calendar.get(Calendar.DAY_OF_WEEK);
        switch (day) {
            case Calendar.SATURDAY:
            case Calendar.SUNDAY:
                System.out.println("It's the weekend");
                break;
            default:
                System.out.println("It's a weekday");
                break;
        }

        // switch without an expression is an alternate way to express if/else logic.
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        switch (true) {
            case (hour < 12):
                System.out.println("It's before noon");
                break;
            default:
                System.out.println("It's after noon");
                break;
        }

        // A type switch compares types instead of values.
        whatAmI(true);
        whatAmI(1);
        whatAmI("hey");
    }

    // In Java, we achieve a type switch using instanceof
    static void whatAmI(Object obj) {
        if (obj instanceof Boolean) {
            System.out.println("I'm a bool");
        } else if (obj instanceof Integer) {
            System.out.println("I'm an int");
        } else {
            System.out.printf("Don't know type %s\n", obj.getClass().getSimpleName());
        }
    }
}