public class vehicle{
public float journey; //¶¨Òå»ú¶¯³µÐмÝǧÃ×Êý
public int wheelNum; //¶¨Òå»ú¶¯³µÂÖ×ÓÊýÁ¿
public int loadNum; //¶¨Òå»ú¶¯³µÔØ¿ÍÈËÊý
public int driveSpeed; //¶¨Òå»ú¶¯³µÊµ¼ÊÐÐÊ»ËÙ¶È /**
*vehicleÀ๹Ô캯Êý£¬É趨³õʼֵ
*/
public vehicle(){
journey=100.3f; //ȱʡ»ú¶¯³µÒѾ­ÐÐÊ»100.3km
wheelNum=4; //ȱʡ»ú¶¯³µÓÐËĸöÂÖ×Ó
loadNum=1; //ȱʡ»ú¶¯³µÔØ¿ÍÈËÊýĿΪ1ÈË
} //vehicle
/**
*vehicleÀàµÄdriveAtÐÐÊ»·½·¨
*/
public void driveAt(int speed){
if(speed>=60){
System.out.println("ÐÐÊ»Ëٶȹý¿ì£¬ÈÝÒ×Ôì³ÉʹÊ");
driveSpeed=40; //Èç¹ûÐÐÊ»Ëٶȹý¿ì£¬ÔòÈûú¶¯³µ×Ô¶¯ÒÔ40µÄËÙ¶ÈÐÐÊ»
}
else{
System.out.println("ÄãÔÚ°²È«ÐÐÊ»ËÙ¶ÈÄÚÐÐÊ»");
driveSpeed=speed;
}
} //driveAt()
public static void main(String[] args){
vehicle obj = new vehicle();
obj.driveAt(40);
}
}/**vehicle*/
你缺少了main函数,就少了main线程
public float journey; //¶¨Òå»ú¶¯³µÐмÝǧÃ×Êý
public int wheelNum; //¶¨Òå»ú¶¯³µÂÖ×ÓÊýÁ¿
public int loadNum; //¶¨Òå»ú¶¯³µÔØ¿ÍÈËÊý
public int driveSpeed; //¶¨Òå»ú¶¯³µÊµ¼ÊÐÐÊ»ËÙ¶È /**
*vehicleÀ๹Ô캯Êý£¬É趨³õʼֵ
*/
public vehicle(){
journey=100.3f; //ȱʡ»ú¶¯³µÒѾ­ÐÐÊ»100.3km
wheelNum=4; //ȱʡ»ú¶¯³µÓÐËĸöÂÖ×Ó
loadNum=1; //ȱʡ»ú¶¯³µÔØ¿ÍÈËÊýĿΪ1ÈË
} //vehicle
/**
*vehicleÀàµÄdriveAtÐÐÊ»·½·¨
*/
public void driveAt(int speed){
if(speed>=60){
System.out.println("ÐÐÊ»Ëٶȹý¿ì£¬ÈÝÒ×Ôì³ÉʹÊ");
driveSpeed=40; //Èç¹ûÐÐÊ»Ëٶȹý¿ì£¬ÔòÈûú¶¯³µ×Ô¶¯ÒÔ40µÄËÙ¶ÈÐÐÊ»
}
else{
System.out.println("ÄãÔÚ°²È«ÐÐÊ»ËÙ¶ÈÄÚÐÐÊ»");
driveSpeed=speed;
}
} //driveAt()
public static void main(String[] args){
vehicle obj = new vehicle();
obj.driveAt(40);
}
}/**vehicle*/
你缺少了main函数,就少了main线程
public class Vehicle{...}你的这段程序本身没有问题,但是它不能单独运行
因为一个Java程序必须要有一个public static void main(String[], argw){} 方法(method).你的这个Vehicle 是一个类(class),不能作为一个完整的程序来运行