Convert comma separated string into a HashSet

Question

So, how would you go about converting

String csv = "11,00,33,66,44,33,22,00,11"; 

to a hashset in the quickest-most optimized way.

This is for a list of user-ids.

Update

I ran all the answers provided through a test program where each method was called 500,000 times for a bigger CSV string. This test was performed 5 times continously (in case program startup slowed initial method) and I got the following in milliseconds (ms):

Method One Liner->  6597 Method Split&Iterate->  6090 Method Tokenizer->  4306 ------------------------------------------------ Method One Liner->  6321 Method Split&Iterate->  6012 Method Tokenizer->  4227 ------------------------------------------------ Method One Liner->  6375 Method Split&Iterate->  5986 Method Tokenizer->  4340 ------------------------------------------------ Method One Liner->  6283 Method Split&Iterate->  5974 Method Tokenizer->  4302 ------------------------------------------------ Method One Liner->  6343 Method Split&Iterate->  5920 Method Tokenizer->  4227 ------------------------------------------------   static void method0_oneLiner() {         for (int j = 0; j < TEST_TIMES; j++) {             Set<String> hashSet = new HashSet<String>(Arrays.asList(csv                     .split(",")));         }     }      // ———————————————————————————————–      static void method1_splitAndIterate() {          for (int j = 0; j < TEST_TIMES; j++) {             String[] values = csv.split(",");             HashSet<String> hSet = new HashSet<String>(values.length);             for (int i = 0; i < values.length; i++)                 hSet.add(values[i]);         }     }      static void method2_tokenizer() {          for (int j = 0; j < TEST_TIMES; j++) {             HashSet<String> hSet = new HashSet<String>();             StringTokenizer st = new StringTokenizer(csv, ",");             while (st.hasMoreTokens())                 hSet.add(st.nextToken());         }     } 

Answer 1

String[] values = csv.split(","); Set<String> hashSet = new HashSet<String>(Arrays.asList(values));