String Tokenizer

The java.util.StringTokenizer class allows you to break a string into tokens. It is simple way to break string.

The set of delimiters (the characters that separate tokens) may be specified either at creation time or on a pertoken basis.

StringTokenizer Split by space

import java.util.StringTokenizer;
public class Simple{
   public static void main(String args[]){
      StringTokenizer st = new StringTokenizer("apple ball cat dog"," ");
        while (st.hasMoreTokens()) {
            System.out.println(st.nextToken());
        }
     }
  }

Output:

apple
ball
cat
dog

Related Article: How To Split Strings in Java

StringTokenizer Split by comma ‘,’

public static void main(String args[]) {
StringTokenizer st = new StringTokenizer(“apple,ball cat,dog”, “,”);
while (st.hasMoreTokens()) {
System.out.println(st.nextToken());
}
}

Output:

apple
ball cat
dog

Splitting a string into fixed length parts

Break a string up into substrings all of a known length

The trick is to use a look-behind with the regex \G, which means “end of previous match”:

String[] parts = str.split("(?<=\G.{8})");

The regex matches 8 characters after the end of the last match. Since in this case the match is zero-width, we could more simply say “8 characters after the last match”.

Conveniently, \G is initialized to start of input, so it works for the first part of the input too.

Break a string up into sub strings all of variable length

Same as the known length example, but insert the length into regex:

int length = 5;
String[] parts = str.split("(?<=\G.{" + length + "})");

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