Remove Duplicates in list

• We have to create a list of String.
• Then pass that string top Hashset.(i.e)HashSet will not allow duplicates.
• So the resultant list is a unique list.
• The same procedure you have to follow for Interger etc.For user definied list we have to override 
• hashCode and Equals method.That you can see in my next post.

1. package com.utilitySample;
2.  import org.apache.commons.lang.StringUtils;
3. 
   
4.  public class RemoveDuplicate {
5.  public static void main(String[] args) {
6.      List<String> arrayList1 = new ArrayList<String>();
7.    arrayList1.add("vel");
8.    arrayList1.add("vel");
9.    arrayList1.add("dinesh");
10.    arrayList1.add("dinesh");
11.    arrayList1.add("dinesh");
12.    arrayList1.add("prasanth");
13. 
    
14.    List<String> arrayList2 = new ArrayList<String>(new HashSet<String>(arrayList1));
15. 
    
16.    for (String item : arrayList2){
17.        System.out.println(item);
18.    }      
19.     }
20.  }

 Output :

  dinesh
  vel
  prasanth