switch (num) {

            case 5:

            case 2:

            case 3:

                System.out.println("5,2,3");

                break;

            case 4:

            case 6:

                System.out.println("4,6");

                break;

            case 1:

                System.out.println("1");

                break;

            default:

                System.out.println("Inavlid number");

                break;

        }

switch (variable)

{

  case 1:

  case 2:

    doSomething();

  case 5:

  case 6:

  case 100:

    doOther();

    break;

}