normalization - Normalize double array in java -

i have double arraylist dataset in java. want normalize data data clustering , function normalize data clustering in here normalization data cluster

input = {{-1.3,2.4,5.3.2.1,0.7},{6.4,-3.3,1.9.4.1,0.3}}

below code i've tried far, i'm not sure it's right normalization method

public void getminmax(){     min = new double[input.size()];     max = new double[input.size()];     for(int i=0; < input.size(); i++){         min[i] = 0;         max[i] = 0;         for(int j = 0; j < input.get(i).size(); j++){             if(input.get(i).get(j) >= max[i]){                 max[i] = input.get(i).get(j);             } else if(input.get(i).get(j) <= min[i]){                 min[i] = input.get(i).get(j);             }         }     } }  private void normalizemaxmin() {     for(int i=0; < input.size(); i++){         for(int j = 0; j < input.get(i).size(); j++){             input.get(i).set(j, (input.get(i).get(j) - min[i]) / (max[i] - min[i]));         }     } }