Introduction

In this demo I have used NetBeans IDE 8.2 for debugging purpose. But you can use any java programming language compiler as per your availability..

import java.util.Scanner;
class CurvedSurfaceAreaOfCube 
{      
                    public static void main(String args[]) 
                    {   
       
        Scanner s = new Scanner(System.in);         
        System.out.println("Enter the side of cube:");         
                    double side = s.nextDouble();       
                    double  r = 4*side*side; 
        System.out.println("Curved aurface area of cube is:" +r);      
 
                    }
}

Result