geometricobject.java

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// 抽象类: 几何类(GeometricObject.java: )
public abstract class GeometricObject
{
  protected String color;
  protected double weight;

  // Default construct
  protected GeometricObject()
  {
    color = "white";
    weight = 1.0;
  }

  // Construct a geometric object
  protected GeometricObject(String color, double weight)
  {
    this.color = color;
    this.weight = weight;
  }

  // Getter method for color
  public String getColor()
  {
    return color;
  }

  // Setter method for color
  public void setColor(String color)
  {
    this.color = color;
  }

  // Getter method for weight
  public double getWeight()
  {
    return weight;
  }

  // Setter method for weight
  public void setWeight(double weight)
  {
    this.weight = weight;
  }


  // 抽象方法
  public abstract double findArea();

  // 抽象方法
  public abstract double findPerimeter();

}