Split string into array of character strings

Question

I need to split a String into an array of single character Strings   Eg  splitting  cat  would give the array  c    a    t

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for int i 0 i lt str length   i      System out println str charAt i

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An efficient way of turning a String into an array of one-character Strings would be to do this   String   res   new String str length     for  int i   0  i  lt  str length    i          res i    Character toString str charAt i        However  this does not take account of the fact that a char in a String could actually represent half of a Unicode code-point    If the code-point is not in the BMP    To deal with that you need to iterate through the code points     which is more complicated   This approach will be faster than using String split    clever regex     and it will probably be faster than using Java 8  streams   It is probable faster than this   String   res   new String str length     int 0   0  for  char ch  str toCharArray          res i      Character toString ch         because toCharArray has to copy the characters to a new array

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Maybe you can use a for loop that goes through the String content and extract characters by characters using the charAt method   Combined with an ArrayList lt String gt  for example you can get your array of individual characters

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split  quot       quot   does not work correctly if the string contains surrogate pairs  You should use split  quot    lt     quot    String   splitted    quot  ab quot  split  quot    lt     quot    System out println Arrays toString splitted     output      a  b

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cat  split            This will produce     array   c    a    t

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To sum up the other answers     This works on all Java versions    cat  split            This only works on Java 8 and up    cat  split

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cat  toCharArray     But if you need strings   cat  split       Edit  which will return an empty first value

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If the original string contains supplementary Unicode characters  then split   would not work  as it splits these characters into surrogate pairs  To correctly handle these special characters  a code like this works   String   chars   new String stringToSplit codePointCount 0  stringToSplit length      for  int i   0  j   0  i  lt  stringToSplit length    j          int cp   stringToSplit codePointAt i       char c     Character toChars cp       chars j    new String c       i    Character charCount cp

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If characters beyond Basic Multilingual Plane are expected on input  some CJK characters  new emoji      approaches such as  ab  split          cannot be used  because they break such characters  results into array   a              b    and something safer has to be used    ab  codePoints        mapToObj cp - gt  new String Character toChars cp         toArray size - gt  new String size

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String str    cat   char   cArray   str toCharArray

[java] Split string into array of character strings

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