How can I use as the delimiter with String split in java

Question

What I am trying to do is read a  java file  and pick out all of the identifiers and store them in a list   My problem is with the  split   method   If you run this code the way it is  you will get ArrayOutOfBounds  but if you change the delimiter from     to anything else  the code works   But I need to lines parsed by     so is there another way I could accomplish this   import java io BufferedReader  import java io FileNotFoundException  import java io FileReader  import java io IOException  import java util      public class MyHash       private static String   reserved   new String 100       private static List list   new LinkedList        private static List list2   new LinkedList         public static void main  String args             Hashtable hashtable    new Hashtable 997           makeReserved            readFile            String line          ListIterator itr   list listIterator            int listIndex   0          while  listIndex  lt  list size                   if  itr hasNext                     line   itr next   toString                      PROBLEM IS HERE                                                            String   words   line split          CHANGE THIS AND IT WILL WORK                 System out println words 0           TESTING TO SEE IF IT WORKED                           listIndex                         public static void readFile             String text          String   words          BufferedReader in   null          try               in   new BufferedReader new FileReader  MyHash java       NAME OF INPUT FILE             catch  FileNotFoundException ex                Logger getLogger MyHash class getName    log Level SEVERE  null  ex                     try               while   text   in readLine       null                   text   text trim                    words   text split    s                     for  int i   0  i  lt  words length  i                         list add words i                                      for  int j   0  j  lt  reserved length  j                         if  list contains reserved j                             list remove reserved j                                                                       catch  IOException ex                Logger getLogger MyHash class getName    log Level SEVERE  null  ex                     try               in close              catch  IOException ex                Logger getLogger MyHash class getName    log Level SEVERE  null  ex                        public static int keyIt  int x            int key   x   997          return key             public static int horner  String word           int length   word length            char   letters   new char length            for  int i   0  i  lt  length  i                 letters i  word charAt i                      char   alphabet   new char 26           String abc    abcdefghijklmnopqrstuvwxyz            for  int i   0  i  lt  26  i                 alphabet i  abc charAt i                      int   numbers   new int length           int place   0          for  int i   0  i  lt  length  i                 for  int j   0  j  lt  26  j                     if  alphabet j   letters i                        numbers place  j 1                      place                                                        int hornered   numbers 0    32           for  int i   1  i  lt  numbers length  i                  hornered    numbers i               if  i    numbers length -1                   return hornered                            hornered   hornered   997              hornered    32                    return hornered             public static String   makeReserved             reserved 0     abstract           reserved 1     assert           reserved 2     boolean           reserved 3     break           reserved 4     byte           reserved 5     case           reserved 6     catch           reserved 7     char           reserved 8     class           reserved 9     const           reserved 10     continue           reserved 11     default           reserved 12     do           reserved 13     double           reserved 14     else           reserved 15     enum           reserved 16     extends           reserved 17     false           reserved 18     final           reserved 19     finally           reserved 20     float           reserved 21     for           reserved 22     goto           reserved 23     if           reserved 24     implements           reserved 25     import           reserved 26     instanceof           reserved 27     int           reserved 28     interface           reserved 29     long           reserved 30     native           reserved 31     new           reserved 32     null           reserved 33     package           reserved 34     private           reserved 35     protected           reserved 36     public           reserved 37     return           reserved 38     short           reserved 39     static           reserved 40     strictfp           reserved 41     super           reserved 42     switch           reserved 43     synchronize           reserved 44     this           reserved 45     throw           reserved 46     throws           reserved 47     trasient           reserved 48     true           reserved 49     try           reserved 50     void           reserved 51     volatile           reserved 52     while           reserved 53                 reserved 54                  reserved 55                  reserved 56                 reserved 57     -           reserved 58                 reserved 59                 reserved 60                 reserved 61                  return reserved

User · Answer

If performance is an issue  you should consider using StringTokenizer instead of split  StringTokenizer is much much faster than split  even though it is a  legacy  class  but not deprecated

User · Answer

When splitting with a string literal delimiter  the safest way is to use the Pattern quote   method   String   words   line split Pattern quote          As described by other answers  splitting with       is correct  but quote   will do this escaping for you

User · Answer

String split takes a regex  and     has a special meaning for regexes   You  probably  want something like   String   words   line split           Some folks seem to be having trouble getting this to work  so here is some runnable code you can use to verify correct behaviour   import java util Arrays   public class TestSplit     public static void main String   args        String line    aa bb cc dd       String   words   line split             System out println Arrays toString words           Output is   aa  bb  cc  dd

User · Answer

The argument to split is a regular expression  The period is a regular expression metacharacter that matches anything  thus every character in line is considered to be a split character  and is thrown away  and all of the empty strings between them are thrown away  because they re empty strings   The result is that you have nothing left   If you escape the period  by adding an escaped backslash before it   then you can match literal periods   line split

User · Answer

This is definitely not the best way to do this but  I got it done by doing something like following      String imageName    my image png   String replace   imageName replace           String   split   replace split        System out println  Image name       split 0    System out println  Image extension       split 1      Output      Image name   my image Image extension   png

User · Answer

You might be interested in the StringTokenizer class  However  the java docs advise that you use the  split method as StringTokenizer is a legacy class

User · Answer

The argument to split is a regular expression       matches anything so your delimiter to split on is anything

User · Answer

Have you tried escaping the dot  like this   String   words   line split

[java] How can I use "." as the delimiter with String.split() in java

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