extends作业四

你的名字 2022-06-07 08:09 232阅读 0赞

public class 测试 {
        public static void main(String[] args) {
            PlainRect p=new PlainRect(10,10,10,20);
            p.area();
            p.perimeter();      
            System.out.println("矩形的面积："+p.area());
            System.out.println("矩形的周长："+p.perimeter());
            p.isInside(25.5,13);
    
        }
    
    }

public class PlainRect extends Rect { 
        protected double startX;
        protected double startY;
        public PlainRect(double startX,double startY,double width,double length) {
            this.startX=startX;
            this.startY=startY;
            this.width=width;
            this.length=length;
        }
        public PlainRect() {
            startX=0;
            startY=0;
            width=0;
            length=0;
        }
        public boolean isInside(double x,double y) {
            if(x>=startX&&x<=(startX+length)&&y>=startY&&y<=(startY+width)){
                System.out.println("点在矩形内部");
                return true;
            }else {
                System.out.println("点不在矩形内部");
                return false;
            }       
        }
    }

public class Rect {
        protected double length;
        protected double width;
        public Rect(double length,double width) {
            //super();
            this.length=length;
            this.width=width;
        }
        public Rect() {
            //super();
            length=0;
            width=0;
        }
        public double area() {
            return length*width;
        }
        public double perimeter() {
            return length+width;
        }
    }