circle.java

java的小程序

public class Circle extends GeometricObject
{
  protected double radius;
  public Circle()
  {
    this(1.0, "white", 1.0);
  }
  public Circle(double radius)
  {
    super("white", 1.0);
    this.radius = radius;
  }
  public Circle(double radius, String color, double weight)
  {
    super(color, weight);
    this.radius = radius;
  }
  public double getRadius()
  {
    return radius;
  }
  public void setRadius(double radius)
  {
    this.radius = radius;
  }
  public double findArea()
  {
    return radius*radius*Math.PI;
  }
  public double findPerimeter()
  {
    return 2*radius*Math.PI;
  }
  public boolean equals(Circle circle)
  {
    return this.radius == circle.getRadius();
  }
  public String toString()
  {
    return "Circle " ;
  }
}