public Long getMode() {


            long repeatCount = 0;
            long previousRepCnt = 0;

            for (int i = 0; i < length; i++) {
                int count = 0;

                for (int j = 0; j < length; j++) {

                    if (this.elements[i] == this.elements[j]) {
                        count++;
                    }
                }

                if (count > previousRepCnt) {
                    previousRepCnt = count;
                    repeatCount = this.elements[i];
                    mode = repeatCount;

                }

                if (repeatCount == previousRepCnt){
                    mode = (long)-1;
                }

                repeatCount = 0;
            }
        return this.mode;
	}