java - I am not getting why split() and StringTokenizer() behaving differently - 


 public class newclass {     public static void main(string args[])      {         system.out.println("operation 1");         stringtokenizer st1 =             new stringtokenizer("hello   geeks how you", "\\s+");             while (st1.hasmoretokens())             system.out.println(st1.nexttoken());             string s = "hello   geeks how you";             string s1[]= s.split("\\s+");             system.out.println("operation 2");              for( string temp : s1) {                 system.out.println(temp);             }     } }

here after executing code getting output :-

operation 1 hello   geek  how operation 2 hello geeks how

i not getting why split() , stringtokenizer() behaving differently same parameter.

the delim parameter of new stringtokenizer(str, delim) not regular expression. telling stringtokenizer split @ any of \, s, or +, not @ "one or more whitespace characters". , character applies in string "s" in "geeks", that's string split.

if want split @ whitespaces (one or more), use other constructor taking no delim parameter, using " \t\n\r\f" default.


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