circle.java

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// Circle.java: The circle class that extends GeometricObject
public class Circle extends GeometricObject
{
  protected double radius;

  // Default constructor
  public Circle()
  {
    this(1.0, "white", 1.0);
  }

  // Construct circle with specified radius
  public Circle(double radius)
  {
    super("white", 1.0);
    this.radius = radius;
  }

  // Construct a circle with specified radius, weight, and color
  public Circle(double radius, String color, double weight)
  {
    super(color, weight);
    this.radius = radius;
  }

  // Getter method for radius
  public double getRadius()
  {
    return radius;
  }

  // Setter method for radius
  public void setRadius(double radius)
  {
    this.radius = radius;
  }

  // Implement the findArea method defined in GeometricObject
  public double findArea()
  {
    return radius*radius*Math.PI;
  }

  // Implement the findPerimeter method defined in GeometricObject
  public double findPerimeter()
  {
    return 2*radius*Math.PI;
  }

  // Override the equals() method defined in the Object class
  public boolean equals(Circle circle)
  {
    return this.radius == circle.getRadius();
  }

  // Override the toString() method defined in the Object class
  public String toString()
  {
    return "[Circle] radius = " + radius;
  }
}