求解英文爪哇

To produce a program that calculates and outputs the circumference and area of a circle given its radius.
You are asked to model the system by two classes. An application class Driver containing the main method, and a class Circle storing the radius of the circle. Such class will have the responsibility to compute the two required numerical outputs: the length of the circumference and the area of the circle (as results of methods with the same name).

为了产生一个程序，计算和产出的周长和鉴于其半径圆的面积。

要求您模型两个类的系统。驱动程序的应用程序类包含的主要方法，类圆存储圆的半径。这种阶层有责任来计算两个数字输出要求：圆周的长度和圆的面积（作为方法的结果具有相同的名称）。

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