RemoveDuplicates.java

public String eliminateDuplicates(String in)
{
   HashSet<String> set=new HashSet<String>();
   String out="";
   for(int i=0;i<in.length();i++)
   {
     String ch=in.substring(i,i+1);
     if(!set.contains(ch))
     {
       out=out+ch;
       set.add(ch);
     }
   }
   
   return out;
   
   
}