设计一个矩形类Rectangle，包含私有的数据成员宽度(Width)和高度(Height)；公有的方法double getArea()返回矩形的面积，公有的方法double getPerimeter()返回矩形的周长。

例如:

Rectangle rect=new Rectangle(8,5);
System.out.printf("The Area is %.2f,Perimeter is %.2f\n", rect.getArea(),rect.getPerimeter());

The Area is 40.00,Perimeter is 26.00

class Rectangle{private double Width;private double Height;public Rectangle(double width, double height) {Width = width;Height = height;}public double getArea() {return Width * Height;}public double getPerimeter(){return (Width + Height) * 2;}
}
public class Test{public static void main(String[] args) {Rectangle rect=new Rectangle(8,5);System.out.printf("The Area is %.2f,Perimeter is %.2f\n", rect.getArea(),rect.getPerimeter());}
}