定义一个 Shapes接口，至少含有两个抽象方法：一个计算面积，一个计算周长 定义一个Circles类实现了Shapes接口 定义一个Rectangles实现了Shapes接口老师逼的紧 做不出来杀头啊 各位帮忙啊!!!

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interface Shapes { public double computeArea(); public double computeCircle();}class Cirlces implements Shapes { private final double PI = 3.1415926; double r; public Circles(double r) { this.r = r; } public double computeArea() { return PI * r * r;}public double computeCircle() {return PI * 2 * r;}}