Randomly Generate specific numbers

I want to randomly generate numbers from 1 - 5 but the catch is it should not randomly generate its currentFloor. My problem is from case 2 until 4. In case 2, it should randomly generate numbers 1, 3, 4, and 5. Same logic applies to case 3 and case 4.

switch(currentFloor) {
            //generates number from 2-5
            case 1:
                int destination1 = rand1.nextInt(3) + 2;
                destElevator.add(destination1);
                System.out.println(destElevator);
                break;
            case 2:
            case 3:
            case 4:
            //generates number from 1-4
            case 5:
                int destination2 = rand1.nextInt(3) + 1;
                destElevator.add(destination2);
                System.out.println(destElevator);
                break;
        }