Why my code could run on Eclipse with the time exceed example

• public class ThreeSum {
public static void main(String[] args) {
int[] num ={7,-1,14,-12,-8,7,2,-15,8,8,-8,-14,-4,-5,7,9,11,-4,-15,-6,1,-14,4,3,10,-5,2,1,6,11,2,-2,-5,-7,-6,2,-15,11,-6,8,-4,2,1,-1,4,-6,-15,1,5,-15,10,14,9,-8,-6,4,-6,11,12,-15,7,-1,-9,9,-1,0,-4,-1,-12,-2,14,-9,7,0,-3,-4,1,-2,12,14,-10,0,5,14,-1,14,3,8,10,-8,8,-5,-2,6,-11,12,13,-7,-12,8,6,-13,14,-2,-5,-11,1,3,-6};

``````    threeSum(num);
}
public static List<List<Integer>> threeSum(int[] num) {
List<Integer> ListNum=new ArrayList<Integer>();
for(int i=0;i<num.length;i++){
}
ListNum.sort(Comparator.naturalOrder());
List<List<Integer>> Total = new ArrayList<List<Integer>>();

List<Integer> rowlistpre= new ArrayList<>();

Map<Integer, Integer> map = new HashMap<Integer, Integer>();

for (int i = 0; i < num.length; i++) {
map.put(ListNum.get(i), i);

}
for (int i = 0; i < ListNum.size() - 2; i++) {
for (int j = i + 1; j < ListNum.size() - 1; j++) {
int value = -ListNum.get(i) - ListNum.get(j);

if (map.containsKey(value) && (map.get(value) >i) && (map.get(value) >j)) {
rowlistpre.clear();
List<Integer> rowlistnew = new ArrayList<>();
if(!Total.contains(rowlistnew)) {
}

}
}
}
System.out.println("total is"+Total);