code: public float[] getFloatArray(final String key) {
  		final String[] value = getArray(key);
  		if (value != null) {
  			final float[] result = new float[value.length];
  			for (int i = 0; i < value.length; i++) {
  				result[i] = Float.parseFloat(value[i]);
  			}
  			return result;
  		}
  		return null;
  	}
docs: Gets the prefixed key and parse it to an float[]<br>
  Each comma-separated list can be used.
  
  @param key
  the key
  @return float[] or null if the key couldn't get found.