Thanks your guidence lead to Better solution !!

public class Solution {

// Complete the minimumAbsoluteDifference function below.
static int minimumAbsoluteDifference(int[] arr) {

    Arrays.sort(arr);
    int min = Math.abs(arr[0] - arr [1]);
    for(int i = 1 ; i < arr.length-1 ; i++){
        if(Math.abs(arr[i] - arr[i+1]) < min)
             min = Math.abs(arr[i] - arr[i+1]);
    }

return min;
}