Java 实例 使用方法重载查找几何图形的面积

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);
}
}



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