Java 8.1

问题及代码：

写一个矩形类，包括构造函数和返回矩形面积和周长的函数，运行宽为4，高为40和宽为3.5，高为35.9的两个矩形。

public class Rectangle2 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Rectangle2 rectangle1 = new Rectangle2();
		System.out.println("The area of the rectangle1 is: "
				+ rectangle1.getArea());
		System.out.println("The perimeter of the rectangle1 is: "
				+ rectangle1.getPerimeter());
		Rectangle2 rectangle2 = new Rectangle2(4, 40);
		System.out.println("The area of the rectangle2 is: "
				+ rectangle2.getArea());
		System.out.println("The perimeter of the rectangle2 is: "
				+ rectangle2.getPerimeter());
		Rectangle2 rectangle3 = new Rectangle2(3.5, 35.9);
		System.out.println("The area of the rectangle3 is: "
				+ rectangle3.getArea());
		System.out.println("The perimeter of the rectangle3 is: "
				+ rectangle3.getPerimeter());
	}

	double width;
	double height;

	Rectangle2() {
		width = 1;
		height = 1;
	}

	Rectangle2(double w, double h) {
		width = w;
		height = h;
	}

	double getArea() {
		return width * height;
	}

	double getPerimeter() {
		return 2 * (width + height);
	}
}

运行结果：