Java 实例 使用方法重载查找几何图形的面积

该程序使用方法重载找到正方形，矩形和圆形的面积。在这个程序中，我们有三个同名的方法area()，这意味着我们正在重载area()方法。通过面积方法的三种不同实现，我们计算方形，矩形和圆形的面积。

示例：使用方法重载编程以查找方形，矩形和圆的面积

class JavaExample
{
    void calculateArea(float x)
    {
        System.out.println("Area of the square: "+x*x+" sq units");
    }
    void calculateArea(float x, float y)
    {
        System.out.println("Area of the rectangle: "+x*y+" sq units");
    }
    void calculateArea(double r)
    {
        double area = 3.14*r*r;
        System.out.println("Area of the circle: "+area+" sq units");
    }
    public static void main(String args[]){
        JavaExample obj = new JavaExample();

        /* This statement will call the first area() method
         * because we are passing only one argument with
         * the "f" suffix. f is used to denote the float numbers
         * 
         */
     obj.calculateArea(6.1f);

     /* This will call the second method because we are passing 
      * two arguments and only second method has two arguments
      */
     obj.calculateArea(10,22);

     /* This will call the second method because we have not suffixed
      * the value with "f" when we do not suffix a float value with f 
      * then it is considered as type double.
      */
     obj.calculateArea(6.1);
    }
}

输出：

Area of the square: 37.21 sq units
Area of the rectangle: 220.0 sq units
Area of the circle: 116.8394 sq units