java - 抽象类未初始化参数

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我正在尝试创建一个抽象类 SolidFigure。圆柱体和矩形棱柱都将从它继承。

我的问题是，每当我实例化两个类(圆柱体或 rectPrism)中的任何一个时，构造函数都不会初始化 SolidFigure 中的公共(public)属性高度(它将为零)

这是代码:

实体图:

public abstract class SolidFigure {

    private double height;

    public SolidFigure(double height) {
        height = this.height;
    }

    public double getHeight() {
        return height;
    }

    protected abstract boolean isEqual(SolidFigure s);

    protected abstract double calculateVolume();
}

气缸:

 class Cylinder extends SolidFigure{

   private double radius;
   private static double PI = 3.14;

   public Cylinder(double height, double radius) {
       super(height);
       this.radius = radius;
   }

   @Override
   protected double calculateVolume() {
        return radius * PI * getHeight();
   }

   @Override
   protected boolean isEqual(SolidFigure s) {
       return this.calculateVolume() == s.calculateVolume();
   }
}

矩形棱镜:

   class RectPrism extends SolidFigure{
      private double length, width;

   public RectPrism(double height, double length, double width) {
       super(height);
       this.length = length;
       this.width = width;
   }

   @Override
   protected double calculateVolume() {
        return length * width * getHeight();
   }

   @Override
   protected boolean isEqual(SolidFigure s) {
       return this.calculateVolume() == s.calculateVolume();
   }
 }

主要:

    SolidFigure c = new Cylinder(12.0, 3);
    RectPrism r = new RectPrism(10.0, 4, 2);

    System.out.println(c.getHeight()); // This is zero
    System.out.println(r.calculateVolume()); // zero resulting from height

Answer 1

应该是相反的

public SolidFigure(double height) {
        this.height = height;
    }