java - Unique Characters -


i working on project class. have find number of unique hashtags in tweet input java. relatively new coding, stuck how find out unique hashtags. far, have scanner. 

package edu.bsu.cs121.jmgibson;  import java.util.arraylist; import java.util.list; import java.util.scanner;  public class hashtag {  public static void main(string args[]) {     arraylist<string> hashtag = new arraylist<string>();     scanner tweet = new scanner(system.in);     while (true) {         system.out.println("please enter name: ");         hashtag.add(tweet.next());     }  }  }

here link usage of scanner:

http://docs.oracle.com/javase/7/docs/api/java/util/scanner.html

you firstly want identify how create needed delimiter. there example in link, looking substring begins # , ends whitespace. since homework assignment exact answer cannot given - however, custom delimiter need be.


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