编辑代码

package dd; public class RectangleTest { /** * 宽 */ int with; /** * 高 */ int height; /** * area()方法，求矩形的面积 * @return 返回面积 */ public double area() { this.with = 5; this.height = 10; return with * height; } /** * perimeter()方法，求矩形周长 * @return */ public double perimeter(){ this.with = 5; this.height = 10; return (with + height) * 2; } /** * 测试方法 */ public static void main(String[] args) { /** * 创建RectangleTest对象 */ RectangleTest r = new RectangleTest(); double retArea = r.area(); System.out.println("矩形的面积-->" + retArea); double retPerimeter = r.perimeter(); System.out.println("矩形的周长-->" + retPerimeter); } }