JAVA easy class -- circle

  1. public class Circle2 {
  3.     public static void main(String[] args) {
  4.         Circle2 circle1 = new Circle2();
  5.         System.out.println("radius " + circle1.radius + " Area " + circle1.getArea());
  6.         Circle2 circle2 = new Circle2(30.0);
  7.         System.out.println("radius " + circle2.radius + " Area " + circle2.getArea());
  8.         circle2.radius = 40.0;
  9.         System.out.println("radius " + circle2.radius + " Area " + circle2.getArea());
  10.     }
  11.     double radius;
  12.     Circle2()
  13.         {
  14.         radius = 1.0;
  15.         }
  16.     Circle2(double dIn)
  17.         {
  18.         radius = dIn;
  19.         }
  20.     double getArea()
  21.         {
  22.         return radius * radius *Math.PI;
  23.         }
  24. }

object and class
class is a template, blueprint that defines data fields and methods will be.
An object is an instance of a class.

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