import Car;
is correct, not "import Car." or "import Car.java";I just compile them on my machine, everything is ok. I am using jdk1.3.E:\Labs\java>javac Car.javaE:\Labs\java>javac SportsCar.javaE:\Labs\java>javac Me.javaE:\Labs\java>java Me
Door Number: 4
Engine Sort: v6 Engine
is correct, not "import Car." or "import Car.java";I just compile them on my machine, everything is ok. I am using jdk1.3.E:\Labs\java>javac Car.javaE:\Labs\java>javac SportsCar.javaE:\Labs\java>javac Me.javaE:\Labs\java>java Me
Door Number: 4
Engine Sort: v6 Engine
删除import car,使当前目录成为default package!