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Program for a Non-Repeating Characters


1)Write a program for non repeating Characters?

  class Char
              {
                   public static void  main(String arsg[])
                    {
                           public static char FirstNonRepatingChar(String word)
                              {


                                Set<characters>nonrepeating = new HashSet<>();  
                                List<characters>nonrepeating = new ArrayList<>();
                                   for(int i=0; i<word.length();i++)
                                         {
                                            char letter = word.charAt(i); 
                                              if(repeating.contains(letter))
                                                      {
                                                         continue;
                                                     }
                                 if(nonrepeating.conntains(letter))   //checking character
                                    {
                                      nonrepeating.remove((character)letter); //removing character
                                      repeating.add(letter);
                                   }
                             else
                              {
                                  nonrepeating.add(letter);
                            }
                 }
    return nonrepeating.get(0);
     }
  }
}


2) Write a program to insert string object into the Treeset reverse of alphabetical order



package treeset;

import java.util.TreeSet;



public class TreeSetDemo
{
 public static void main(String args[])
 {
  TreeSet t= new TreeSet(new MyComparator());
  t.add("Rajesh");
  System.out.println(t);
 
 class MyComparator implements comparator
 {
  public int compare (Object obj1, object obj2) //comparing objects
  {
   String s1= obj1.toString();
   String s2=(String)obj2;             //assiging the values 
   return-s1.CompareTo(s2);
  }
 }

}




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