编辑代码

public class Rectangle {
    double width, height;
    double area, zhou;
    Rectangle(double x) {
        width = x;
        height = x;
    }
    Rectangle(double w, double hei) { 
        width = w;
        height = hei;
    }
    public double zhouRectangle() {
        zhou = (width + height) * 2;
        return zhou;
    }
    public double areaRectangle() {
        area = width * height;
        return area;
    }
    public static void main(String[] args) { 
        double c, s;
        Rectangle Rectangle1 = new Rectangle(10, 20);
        Rectangle Rectangle2 = new Rectangle(8);
        c = Rectangle1.zhouRectangle();
        s = Rectangle2.areaRectangle();
        System.out.println("周长是：" + c);
    System.out.println("面积是：" + s);
    }