1: //Circle.java 3: /** 4: * A class of circles. 5: */ 6: public class Circle implements Measurable 7: { 8: private double myRadius; 9: public Circle(double radius) 10: { 11: myRadius = radius; 12: } 13: public double getPerimeter() 14: { 15: return 2 * Math.PI * myRadius; 16: } 17: public double getCircumference() 18: { 19: return getPerimeter(); 20: } 21: public double getArea() 22: { 23: return Math.PI * myRadius * myRadius; 24: } 25: }