编写求解几何图形（如直线、三角形，矩型，圆，多边型）的周长、面积的应用程序，要求尽可能多的用到面向对象技术的特点，如继承，多态，封装，抽象类，接口，内部类，包等技术。写出算法。-prepared to solve geometric shapes (such as linear, triangular, rectangular, round, the multilateral type) of the perimeter, the area of application procedures, requirements as much as possible the use of object-oriented technology features, such as inheritance, polymorphism, packaging, abstract category, interface, internal categories, such as packet technology. Write algorithm.