mode

public Long getMode() {
		if(this.mode == null) {
			long value = 0;

			for (long i = this.minimum; i <= this.maximum + 1; i++) {
				if (getFrequency(i) < getFrequency(i+1)) {
					value = i+1;
				}
				if (getFrequency(i) > getFrequency(i+1)) {
					value = value;
				}
				if (getFrequency(i) == getFrequency(i+1)) {
					value = -1;
				}
			}
			this.mode = value;
		}
		return this.mode;
}