我在学习如何编写和使用自己的类时遇到了麻烦。例如;构建我自己的类?
import java.text.NumberFormat;
public class BikeCommute {
private String route;
private double distanceTraveled;
private double timeRequired;
private String dateTraveled;
private String mode;
private double gallonsSaved;
final private int mpg = 25;
public BikeCommute(String mode, String dateTraveled, String route,
double distanceTraveled, double timeRequired)
{
mode = this.mode;
route = this.route;
distanceTraveled = this.distanceTraveled;
timeRequired = this.timeRequired;
dateTraveled = this.dateTraveled;
}
public double gallonsCalculated(){
gallonsSaved = distanceTraveled/mpg;
return gallonsSaved;
}
public double getGallons(){
return gallonsSaved;
}
public String toString(){
return mode + route + distanceTraveled + timeRequired + dateTraveled + gallonsSaved;
}
}
我想编写一个名为BikeCommute类,将在路由读,运输方式,行驶距离,所需的时间和日期,此行是旅行,计算有多少气体加仑获救通过将行驶距离除以每加仑英里数,并输出路线,模式,行驶距离,所需时间,行驶日期和加仑节省。但是,当我运行它时,会返回nullnull0.0null0.0。有什么想法吗?