java实验5(Circle.java )

CreateaclasscalledCircle.javawithfieldsnamedradius,area,anddiameter.IncludemethodsnamedsetRadius(),getRadius,andcomputeDiameter(),whichcalculatesthecircle'sdiameter,andcomputeArea(),whichcomputesthecircle'sarea.Hint:diameterofacircleistwiceitsradius.Hint:areaofacircleis3