geometricobject.java

来自「此源码为机械工业出版社出版的《Java语言程序设计》第三版所配套的书中所有源代码」· Java 代码 · 共 51 行

// GeometricObject.java: The abstract GeometricObject class
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;
  }

  // Abstract method
  public abstract double findArea();

  // Abstract method
  public abstract double findPerimeter();
}