Removing duplicates and ordering a list using java
Hi everyone, in this blog post, I will be writing about ' How to remove duplicates and order a list using java '. For removing duplicates in a list, we can put all the contents of the list to a set. For ordering the set, we can use an implementation of treeset. So in general, to remove duplicates and order a set, we could do by putting all the contents of the list to a treeset. Please refer my post about sets to understand more about treesets. Here is the java program to remove duplicates and order a list. package com.blog.techjourney; import java.util.ArrayList; import java.util.List; import java.util.Set; import java.util.TreeSet; public class removeDuplicatesAndOrder { public static void main(String[] args) { List countries = new ArrayList (); countries.add( "Canada" ); countries.add( "Australia" ); countries.add( "Brazil" ); countries.add( "Canada"