Sorting an ArrayList of objects using a custom sorting order in java Do Check My Video On Utility Classes: Example: import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.Iterator; public class Test{ public static void main(String[] args) { ArrayList al = new ArrayList(); al.add(25); al.add(35); al.add(15); al.add(5); al.add(40); System.out.println(al);//[25, 35, 15, 5, 40] Collections.sort(al); System.out.println(al);//[5, 15, 25, 35, 40] System.out.println(Collections.binarySearch(al,15,new MyComparator()));//1 System.out.println(Collections.binarySearch(al,5,new MyComparator()));//0 System.out.println(Collections.binarySearch(al,17));//-3 } } class MyComparator implements Comparator{ public int compare(Object obj1,Object obj2){ Integer i1 = (Integer) obj1; Integer i2 = (Integer) obj2; return i1.compareTo