Get the last three chars from any string - Java

Question

I m trying to take the last three chracters of any string and save it as another String variable  I m having some tough time with my thought process   String word    onetwotwoone  int length   word length    String new word   id getChars length-3  length  buffer  index     I don t know how to use the getChars method when it comes to buffer or index  Eclipse is making me have those in there  Any suggestions

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Here s some terse code that does the job using regex   String last3   str replaceAll                    1      This code returns up to 3  if there are less than 3 it just returns the string   This is how to do it safely without regex in one line   String last3   str    null    str length    lt  3        str   str substring str length   - 3     By  safely   I mean without throwing an exception if the string is nulls or shorter than 3 characters  all the other answers are not  safe       The above code is identical in effect to this code  if you prefer a more verbose  but potentially easier-to-read form   String last3  if  str    null    str length    lt  3        last3   str    else       last3   str substring str length   - 3

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If you want the String composed of the last three characters  you can use substring int    String new word   word substring word length   - 3     If you actually want them as a character array  you should write  char   buffer   new char 3   int length   word length    word getChars length - 3  length  buffer  0     The first two arguments to getChars denote the portion of the string you want to extract  The third argument is the array into which that portion will be put  And the last argument gives the position in the buffer where the operation starts   If the string has less than three characters  you ll get an exception in either of the above cases  so you might want to check for that

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This method would be helpful    String rightPart String text int length        if  text length   lt length  return text      String raw           for  int i   1  i  lt   length  i              raw    text toCharArray   text length  -i             return new StringBuilder raw  reverse   toString

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public String getLastThree String myString        if myString length    gt  3          return myString substring myString length  -3       else         return myString

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Alternative way for  insufficient string length or null  save     String numbers   defaultValue    try     numbers   word substring word length   - 3     catch Exception e       System out println  Insufficient String length

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Here is a method I use to get the last xx of a string   public static String takeLast String value  int count        if  value    null    value trim   length      0    count  lt  1            return                if  value length    gt  count            return value substring value length   - count         else           return value            Then use it like so   String testStr    this is a test string   String last1   takeLast testStr  1     Output  g String last4   takeLast testStr  4     Output  ring

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Why not just String substr   word substring word length   - 3    Update  Please make sure you check that the String is at least 3 characters long before calling substring     if  word length      3      return word    else if  word length    gt  3      return word substring word length   - 3     else        whatever is appropriate in this case   throw new IllegalArgumentException  word has less than 3 characters

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I would consider right method from StringUtils class from Apache Commons Lang  http   commons apache org proper commons-lang apidocs org apache commons lang3 StringUtils html right java lang String  20int   It is safe  You will not get NullPointerException or StringIndexOutOfBoundsException   Example usage   StringUtils right  abcdef   3   You can find more examples under the above link

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The getChars string method does not return a value  instead it dumps its result into your buffer  or destination  array   The index parameter describes the start offset in your destination array   Try this link for a more verbose description of the getChars method   I agree with the others on this  I think substring would be a better way to handle what you re trying to accomplish

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String newString   originalString substring originalString length  -3

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You can use a substring  String word    onetwotwoone  int lenght   word length      Note this should be function  String numbers   word substring word length   - 3

[java] Get the last three chars from any string - Java

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