Answer Posted / deepu

package com.thread;
import java.util.*;
public class Test2 {





public static void main(String[] args) {
String str="aabbbcdabbheaa";
char[]chs=str.toCharArray();
List l1=new ArrayList();

for(Character ch:chs){
l1.add(ch);
 
}
Set s1=new TreeSet(l1);
System.out.println(s1);
}




}

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