package lesson_1016; /**
对象的使用@author Administrator*/ public class Test_Rectangle { public static void main(String[] args) { // 求长为9宽为5的长方形的周长和面积 double perimeter;//周长 double area;//面积
Rectangle rectangle = new Rectangle(9,5);//生成长方形类的对象 /* Rectangle rectangle = new Rectangle();//生成长方形类的对象 //设置属性的值 //rectangle.length = -9; //rectangle.width = 5; rectangle.setLength(9); rectangle.setWidth(5); */ //计算 //perimeter = rectangle.getPerimeter(); perimeter = Rectangle.getPerimeter(9, 5);//提倡 perimeter = rectangle.getPerimeter(9, 5); area = rectangle.getArea(); System.out.println("长：" + rectangle.getLength()); System.out.println("宽：" + rectangle.getWidth()); //System.out.println("周长：" + rectangle.getPerimeter()); //System.out.println("面积：" + rectangle.getArea()); System.out.println("周长：" + perimeter); System.out.println("面积：" + area); }}
