motorvehicle.java

本套光盘提供了本书各章实例的所需的部分源程序文件以及数据库文件。读者 需要使用JDK 1.4(必需）版

public class MotorVehicle extends Vehicle {
    private Engine engine;
    public MotorVehicle(int numberOfWheels, Engine engine) {
    super(numberOfWheels);
    this.engine = engine;
    }
   public String toString() {
      return "MotorVehicle With " + getNumberOfWheels() + " Wheels.  " + engine;
        }
    }