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【简答题】
编写程序。使用继承与扩展的方法编写一个计算圆环面积的Java程序。要求:先设计一个圆形类Circle,再通过继承类Circle定义一个圆环类Ring。圆环可认为是圆形基础上再增加一个描述线宽的属性,即带边的圆形。最后编写一个测试类测试所编写的圆环类Ring。
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