static void Main(string[] args)
{
VendingMachine vm = new VendingMachine();
vm.AddNickel();
vm.AddDime();
vm.AddNickel();
vm.AddDime();
}
public override void AddQuarter(VendingMachine vm)
{
vm.Vend();
vm.ChangeState(Start.Instance());
}
protected virtual void ChangeState(VendingMachine vm, State s)
{
vm.ChangeState(s);
}
public override void AddNickel(VendingMachine vm)
{
this.ChangeState(vm,Twenty.Instance());
}
public virtual void AddNickel(VendingMachine vm)
{
}
public virtual void AddQuarter(VendingMachine vm)
{
}
public override void AddQuarter(VendingMachine vm)
{
vm.Vend(); // start over
}
public virtual void AddDime(VendingMachine vm)
{
}
public override void AddDime(VendingMachine vm)
{
ChangeState(vm, Ten.Instance());
}
public override void AddNickel(VendingMachine vm)
{
ChangeState(vm, Five.Instance());
}
public override void AddQuarter(VendingMachine vm)
{
vm.Vend();
ChangeState(vm, Start.Instance());
// no change returned :-)
}
public virtual void AddNickel(VendingMachine vm)
{
}
protected virtual void ChangeState(VendingMachine vm, State s)
{
vm.ChangeState(s);
}
public virtual void AddQuarter(VendingMachine vm)
{
}
public virtual void AddDime(VendingMachine vm)
{
}