java第十版第九章答案_Java语言程序设计(基础篇)原书第十一版 梁勇 第9章 课后题答案...

9.1设计一个名为Rectangle的类表示矩形

public class Test{

public static void main(String[] args) {

Rectangle rectangle1=new Rectangle(4,40);

System.out.println("矩形的宽是"+rectangle1.width+",高是"+rectangle1.height+",面积是"+rectangle1.getArea()+"，周长是"+rectangle1.getPerimeter());

Rectangle rectangle2=new Rectangle(3.5,35.9);

System.out.print("矩形的宽是"+rectangle2.width+",高是"+rectangle2.height+",面积是"+rectangle2.getArea()+"，周长是"+rectangle2.getPerimeter());

}

}

class Rectangle{

double width=1;

double height=1;

Rectangle(){

}

Rectangle(double newWidth,double newHeight){

width=newWidth;

height=newHeight;

}

double getArea(){