定义一个图形类及其子类（三角形和矩形），分别计算其面积和周长。

class bian {//父类
      public double width;//变量
     public double length;
    public double area;
   public double Perimeter;




    public double areaGraphical() {//方法
   return area;




}




    public double PerimeterGraphical() {
    return Perimeter;




}
}




class rectangle extends bian {//子承父类




   public double areaGraphical() {
   area = width * length;
   return area;
}




   public double PerimeterGraphical() {
   Perimeter = (width + length) * 2;
   return Perimeter;




}
}




class Triangle extends bian {//子类继承父类
    public double high;
    public double bottom;
    public double side;




    public double areaGraphical() {
    area = (bottom * high) / 2;
    return area;
}




    public double PerimeterGraphical() {
    Perimeter = high + bottom + side;
    return Perimeter;




}




}




public class Graphical {//主类




      public static void main(String[] args) {
      rectangle p1 = new rectangle();// 声明对象和创建对象
      p1.width = 6;
      p1.length = 8;
      p1.areaGraphical();
      p1.PerimeterGraphical();
System.out.println("矩形面积:" + p1.areaGraphical() + "矩形周长:" + p1.PerimeterGraphical());//输出
Triangle p2 = new Triangle();// 声明对象和创建对象
      p2.high =6;
      p2.side = 10;
      p2.bottom = 8;
      p2.areaGraphical();
      p2.PerimeterGraphical();
System.out.println("三角形面积:" + p2.areaGraphical() + "三角形周长:" + p2.PerimeterGraphical());//输出
// TODO 自动生成的方法存根


}
}