int [] arr = {1,1,1,2,2,2,3,3,3,4,4,5,5,6,7,8,};

for (int j= 0; j < arr.length; j++){
int count1 = 0; // to find out how many time value is appeared in the arry
for (int i = 0; i < arr.length; i++){
     if(arr[i] == arr[j] ) {    
    // if(arr[i] == 1 ) { once boyleydi ikinci for gelince soldaki oldu
      count1++; // arraydeki harfleri tek tek saymak icin
  }
 }
    if(count1 == 1 ){
    System.out.print(arr[j]+" ");// 6 7 8 uniqe
 }