BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str = null;
System.out.println("Enter your value:");
str = br.readLine();
System.out.println("your value is :"+str);
char[] charArray = str.toCharArray();
Set set = new HashSet();
for (int i = 0; i < charArray.length; i++) {
set.add(charArray[i]);
}
Iterator iterator = set.iterator();
while(iterator.hasNext()){
System.out.print(iterator.next());
}