Java String split() method

by Online Tutorials Library July 22, 2022

Java String split()

The java string split() method splits this string against given regular expression and returns a char array.

Internal implementation

 public String[] split(String regex, int limit) {         /* fastpath if the regex is a          (1)one-char String and this character is not one of the             RegEx’s meta characters “.$|()[{^?*+\”, or          (2)two-char String and the first char is the backslash and             the second is not the ascii digit or ascii letter.          */         char ch = 0;         if (((regex.value.length == 1 &&              “.$|()[{^?*+\”.indexOf(ch = regex.charAt(0)) == -1) ||              (regex.length() == 2 &&               regex.charAt(0) == ‘\’ &&               (((ch = regex.charAt(1))-‘0’)|(‘9’-ch)) < 0 &&               ((ch-‘a’)|(‘z’-ch)) < 0 &&               ((ch-‘A’)|(‘Z’-ch)) < 0)) &&             (ch < Character.MIN_HIGH_SURROGATE ||              ch > Character.MAX_LOW_SURROGATE))         {             int off = 0;             int next = 0;             boolean limited = limit > 0;             ArrayList list = new ArrayList<>();             while ((next = indexOf(ch, off)) != -1) {                 if (!limited || list.size() < limit – 1) {                     list.add(substring(off, next));                     off = next + 1;                 } else {    // last one                     //assert (list.size() == limit – 1);                     list.add(substring(off, value.length));                     off = value.length;                     break;                 }             }             // If no match was found, return this             if (off == 0)                 return new String[]{this};              // Add remaining segment             if (!limited || list.size() < limit)                 list.add(substring(off, value.length));              // Construct result             int resultSize = list.size();             if (limit == 0)                 while (resultSize > 0 && list.get(resultSize – 1).length() == 0)                     resultSize–;             String[] result = new String[resultSize];             return list.subList(0, resultSize).toArray(result);         }         return Pattern.compile(regex).split(this, limit);     }  

Signature

There are two signature for split() method in java string.

 public String split(String regex) and, public String split(String regex, int limit) 

Parameter

regex : regular expression to be applied on string.

limit : limit for the number of strings in array. If it is zero, it will returns all the strings matching regex.

Returns

array of strings

Throws

PatternSyntaxException if pattern for regular expression is invalid

Since

1.4

Java String split() method example

The given example returns total number of words in a string excluding space only. It also includes special characters.

 public class SplitExample{ public static void main(String args[]){ String s1=”java string split method by TutorAspire “; String[] words=s1.split(“\s”);//splits the string based on whitespace //using java foreach loop to print elements of string array for(String w:words){ System.out.println(w); } }} 

Test it Now

java string split method by TutorAspire

Java String split() method with regex and length example

 public class SplitExample2{ public static void main(String args[]){ String s1=”welcome to split world”; System.out.println(“returning words:”); for(String w:s1.split(“\s”,0)){ System.out.println(w); } System.out.println(“returning words:”); for(String w:s1.split(“\s”,1)){ System.out.println(w); } System.out.println(“returning words:”); for(String w:s1.split(“\s”,2)){ System.out.println(w); }  }} 

Test it Now

returning words: welcome  to  split  world returning words: welcome to split world returning words: welcome  to split world

Java String split() method with regex and length example 2

Here, we are passing split limit as a second argument to this function. This limits the number of splitted strings.

 public class SplitExample3 { public static void main(String[] args) { String str = “Tutoraspirett”; System.out.println(“Returning words:”); String[] arr = str.split(“t”, 0); for (String w : arr) { System.out.println(w); } System.out.println(“Split array length: “+arr.length); } } 

Returning words: Java poin Split array length: 2

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