JSP_JAVA基本语法-类

=>Circle.java

class Circle

{// 说明：创建圆类；

        double radius;        //圆半径；

        double getArea()

        {

                return radius*radius*3.14159;

        }

}

=>CircleMain.java

public class CircleMain

{

        public static void main(String args[])

        {

                Circle c = new Circle();   // 创建圆对象；

                c.radius = 12.2;

                System.out.print("半径为" + c.radius + "的圆面积为" + c.getArea() + ";");

        }

}