我开始使用类来创建一个简单的触点输出开始,然后一个更新的版本是这样的: My Contacts
-----------
??? Murphy 555-555-8980
George Smith 555-555-2323
Mike Johnson 555-555-4780
-----------
My Contacts
-----------
Cade Murphy
调用变量i有这样的代码: public class Barrier
{
private Car myCar;
private Sensor mySensor;
private Card myCard;
public Barrier()
{
myCar = new Car();
mySensor = new Sensor();
my