mkock

public interface Vehicle {
        public void start();
        public void stop();
}

public class Car implements Vehicle {
        public void start() {
                System.out.println("starting engine...");
        }
        public void stop() {

mkock

type student interface {
	register(context.Context, string, string, int)
	enrollCourse(uint32, time.Time) error
	pass(uint32) error
	fail(uint32) error
}

type alsoStudent interface {
	register(ctx context.Context, name, profession string, age int)
	enrollCourse(courseID uint32, start time.Time) error

mkock

type foobar interface {
	foo()
	bar()
}

type itemA struct{}

func (a *itemA) foo() {
	fmt.Println("foo on A")
}

mkock

Starting simulation
Express Line: starting
Express Line: arriving at "Downtown"
Passenger with SSN 12345612-22: charged 5.00 of arbitrary money
Express Line: boarded passenger with SSN "12345612-22"
Passenger with SSN 11223322-67: charged 3.50 of arbitrary money
Express Line: boarded passenger with SSN "11223322-67"
    Passenger with SSN "12345612-22" is heading to "The University"
    Passenger with SSN "11223322-67" is heading to "The Village"
Express Line: carrying 2 passengers: heading for next stop

mkock

john := busservice.Prospect{
	SSN:         "12345612-22",
	Destination: &s2,
}
betty := busservice.Prospect{
	SSN:         "11223322-67",
	Destination: &s3,
}

mkock

// SeniorAge is the minimum age from which a Passenger is considered a senior to the BusCompany.
const SeniorAge = 65

// IsSenior returns true if the Passenger is a senior, and false otherwise.
// IsSenior detects age by extracting the last two digits from the SSN and treating them like an age.
func (p Passenger) IsSenior() bool {
	age,err:=strconv.ParseInt(p.SSN[len(p.SSN)-2:],10,8)
	if err != nil {
		panic("invalid SSN: " + p.SSN)
	}

mkock

// NotifyBusArrival is called by Bus upon arrival.
func (b *BusStop) NotifyBusArrival(bus *Bus) {
	for _, p := range b.prospects {
		if bus.StopsAt(p.Destination) {
			pas := p.ToPassenger()
			bus.Board(pas, bus.Company.GetPricing()(pas))
		}
	}
}

mkock

// BusCompany represents the bus company responsible for the Bus service. BusCompany determines price policies.
type BusCompany string

// GetPricing returns a price calculator based on the pricing policy of the day.
func (b BusCompany) GetPricing() PriceCalculator {
	wd := time.Now().Weekday()
	if wd == time.Saturday || wd == time.Sunday {
		return WeekendPricing
	}
	return WorkdayPricing

mkock

// WorkdayPricing charges EUR 6 for regular Passengers and EUR 4.5 for seniors during workdays.
func WorkdayPricing(p Passenger) float64 {
	if p.IsSenior() {
		return 4.5
	}
	return 6.0
}

// WeekendPricing charges EUR 5 for regular Passengers and EUR 3.5 for seniors during weekends.
func WeekendPricing(p Passenger) float64 {

mkock

// Board adds the given Passenger to the Bus and charges them a ticket price calculated by chargeFn if they don't already have a paid ticket.
// Board returns false if the Passenger was not allowed to board the Bus.
func (b *Bus) Board(p *Passenger, chargeFn PriceCalculator) bool {
	var allowed bool // Default value is false
	if p.HasValidTicket {
		allowed = true
	} else {
		amount := chargeFn(*p)
		passenger := p.Charge(amount)
		allowed = passenger.HasValidTicket