Circle.java

/*
 * The Circle class models a circle with a radius and color.
 */
public class Circle {  // Save as "Circle.java"
   // private instance variable, not accessible from outside this class
   private double radius;
   private String color;
   
   // The default constructor with no argument.
   // It sets the radius and color to their default value.
   public Circle() {
      radius = 1.0;
      color = "red";
   }
   // 3rd constructor to construct a new instance of Circle with the given radius and color
    public Circle(double radius, String color){
        this.radius = radius;
        this.color = color;
    }
   
   // 2nd constructor with given radius, but color default
   public Circle(double radius) {
      this.radius = radius;
      color = "red";
   }
   
   // A public method for retrieving the radius
   public double getRadius() {
     return radius; 
   }
   
   // A public method for computing the area of circle
   public double getArea() {
      return radius*radius*Math.PI;
   }
   public String getColor(){
       return color;
   }
   public void setColor(String newColor){
       color = newColor;

   }
   public void setRadius(double newRadius){
       radius = newRadius;
   }
   // Return a description of this instance in the form of
// Circle[radius=r,color=c]
    public String toString() {
    return "Circle[radius=" + radius + " color=" + color + "]";
    }
    public double getCircumference(){
        return (radius*2)*Math.PI;
    }
}