Design Parking System LeetCode solution in Java

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class ParkingSystem {
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  private int slots[] = new int[3];
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  public ParkingSystem(int big, int medium, int small) {
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    slots[0] = big;
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    slots[1] = medium;
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    slots[2] = small;
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  }
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  public boolean addCar(int carType) {
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    if (slots[carType - 1] > 0) {
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      slots[carType - 1]--;
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      return true;
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    }
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    return false;
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  }
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}