public class Shape?{ protected String color; public void printColor(){ ????System.out.println ("顏色是:"+color); } public Shape (String color){ ????this.color = color public Shape() { } } public class Circle extends Shape{ ????private double radius; public Circle()?{ radius = 0; } public Circle (double radius,string color) { ????this. radius = radius; ????this color = color; } public double getRadius () {? return?radius; } public void setRadius (double radius) { ????this. radius = radius; } public double getPerimeter() { return 2 * Math.PI * radius; } public double getArea() { ????return Math.PI * radius * radius; } void disp(){ System . out.println("圓的周長(zhǎng)為: "+ getPer imeter());