我在寻找下面发布的代码的帮助。这是一个问题,我必须制作一个球体课程和另一个课程来测试它。我几乎了解了一切,但唯一让我难过的是设置一个新的直径并获得新的音量。当我设置一个新的直径时,直径容易改变,但是当我尝试再次运行音量时,它只使用旧的直径而不是新的直径。请帮助谢谢你!Java初学者:Sphere类
public class Sphere {
private double sphDiam, volume, surfArea;
private final double VOL_RELAY = 4.0/3.0;
private final int SURF_CONST = 4;
public Sphere(double sphDiam) {
this.sphDiam = sphDiam;
setVolume();
setSurfaceArea();
}
public double getDiam() {
return sphDiam;
}
public void setDiam(double sphDiam) {
this.sphDiam = sphDiam;
}
public double getVolume() {
return volume;
}
public void setVolume() {
volume = Math.pow(sphDiam/2, 3) * Math.PI * VOL_RELAY;
}
public double getSurfaceArea() {
return surfArea;
}
public void setSurfaceArea() {
surfArea = Math.pow(sphDiam/2, 2) * Math.PI * SURF_CONST;
}
public String toString() {
return "Sphere diameter: " + sphDiam + "\nSphere Volume: " + volume + "\nSphere Surface Area: " + surfArea;
}
}
public class MultiSphere {
public static void main(String[] args) {
Sphere sph1 = new Sphere(10.5);
Sphere sph2 = new Sphere(8.4);
Sphere sph3 = new Sphere(20.1);
sph1.setDiam(3.2);
System.out.println(sph1.getDiam());
System.out.println(sph1.getVolume());
System.out.println(sph1.getSurfaceArea());
System.out.println(sph1);
System.out.println();
sph1.setDiam(2.5);
System.out.println(sph1.getDiam());
System.out.println(sph1.getVolume());
System.out.println(sph1.getSurfaceArea());
System.out.println(sph1);
System.out.println();
System.out.println(sph2.getDiam());
System.out.println(sph2.getVolume());
System.out.println(sph2.getSurfaceArea());
System.out.println(sph2);
System.out.println();
System.out.println(sph3.getDiam());
System.out.println(sph3.getVolume());
System.out.println(sph3.getSurfaceArea());
System.out.println(sph3);
System.out.println();
}
}
您正在调用'setVolume()'来计算音量并设置它。但是除了构造函数之外,你永远不会调用这个方法。设置新直径后,必须再次调用该方法。另外我会建议只是摆脱'setVolume()'和'setSurfaceArea()'方法,并在你的getter方法中进行计算。 –