程式碼如下

package one;

public class TestRectangle {
    public static void main(String[] args){
        Rectangle zheng = new Rectangle();
        zheng.height=20;
        zheng.width=10;
        int area = zheng.calArea();
        System.out.println("周長為"+area);
        int aree =zheng.calPefimeter();
        System.out
 
.println("面積為"+aree);
    }
}

class Rectangle{
    int height;
    int width;
    public int calArea(){
        return 2*height + 2*width;
    }
    public int calPefimeter(){
        return height * width;
    }
}