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Tip of the Day
Language: Java
Expertise: Intermediate
Apr 12, 2004



Application Security Testing: An Integral Part of DevOps

Check for Duplicates in an ArrayList

This is a simple method to check for duplicates in an ArrayList:

checkDuplicate : Method

public static boolean checkDuplicate(ArrayList list) {
 HashSet set = new HashSet();
 for (int i = 0; i < list.size(); i++) {
  boolean val = set.add(list.get(i));
  if (val == false) {
  	return val;
 return true;
Vijayanandraj Amaladoss
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