public static void main(String [ ] args){
    Facade facade = new Facade() ;
    int x = 3;
    System.out.println("Cube o f " + x + " : " + facade.cubeX(3));
    System.out.println("Cube o f " + x + " times 2 : " + facade.cubeXTimes2(3));
    System.out.println( x + " t o sixth power times 2 : " + facade.xToSixthPowerTimes2(3));
    }