用重载计算规则图形的面积

小鱼儿 2023-07-25 08:39 55阅读 0赞

**目标**：计算各种规则图形的面积：长方形、正方形、圆、三角形。

public class Area {
        final double PI = 3.14f;
        double r;
        double width,Long;
        int side;
        double a,b,c;
        double area;
    
    
        void ar(double r){ //参数为圆的半径
            area = PI * r *r;
            System.out.println("半径为" + r + "的圆的面积：" + area);
        }
    
        void ar(double width,double Long){ //长方形的长和宽
            area = width * Long;
            System.out.println("长为"+ Long +"宽为" + width + "的长方形面积为：" + area);
        }
    
        void ar(int side){ //正方形的边长
            area = side * side;
            System.out.println("边长为" + side + "的正方形面积为：" + area);
        }
    
        void ar(double a, double b, double c) {// 三角形的三条边
            //从三边求面积,最快的结果就是海伦公式：
            //设P=（a+b+c）/2 则：面积S=√p(p-a)(p-b)(p-c)
            double p = (a+b+c)/2;
            area =Math.sqrt(p * (p-a)* (p-b) * (p-c));
            System.out.println("三边为" + a +","+ b +"," + c+"的三角形的面积为：" + area);
        }
    
        public static void main(String[] args) {
            Area graph = new Area();
            graph.ar(5.5,3.3);
            graph.ar(12);
            graph.ar(5.5);
            graph.ar(3.0,4.0,5.0);
        }
    }

**运算结果：**![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x1ZHVsZ2U_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x1ZHVsZ2U_size_16_color_FFFFFF_t_70]: /images/20230528/df114bea50e8402eb42ef40df3da3e90.png