How to check how many letters are in a string in java

Question

How do you check how many letters are in a Java string   How do you check what letter is in a certain position in the string  i e  the second letter of the string

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1  To answer your question     String s  Java     System out println s length

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To answer your questions in a easy way       a  String length        b  String charAt    String index

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A   String str    a string   int length   str length        length    8   http   download oracle com javase 7 docs api java lang String html length 28 29  edit   If you want to count the number of a specific type of characters in a String  then a simple method is to iterate through the String checking each index against your test case   int charCount   0  char temp   for  int i   0  i  lt  str length     i           temp   str charAt  i         if  temp TestCase           charCount        where TestCase can be isLetter     isDigit     etc   Or if you just want to count everything but spaces  then do a check in the if like temp         B   String str    a string   char atPos0   str charAt  0       atPos0     a    http   download oracle com javase 7 docs api java lang String html charAt 28int 29

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If you are counting letters  the above solution will fail for some unicode symbols   For example for these 5 characters sample length   will return 6 instead of 5   String sample     u760c u0444 u03b3 u03b5 ud800 udf45         e   The codePointCount function was introduced in Java 1 5 and I understand gives better results for glyphs etc  sample codePointCount 0  sample length       returns 5   http   globalizer wordpress com 2007 01 16 utf-8-and-string-length-limitations

[java] How to check how many letters are in a string in java?

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