Library for identifying lexical features of a string in Java [closed]

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Closed 5 years ago.

currently I need to find some special lexical characteristics of a string in Java such as

• Total number of characters
• Total number of alphabetic characters
• Total number of uppercase characters
• .... I wonder that is there a library can do that? It would be great to save coding time.
  Thank you very much.

Answer 1

google guava can do that.

Have a look at the Strings module: http://code.google.com/p/guava-libraries/wiki/StringsExplained

Check out the CharMatcher on that site!

And after matching it, you just use the length() method of the remaining String.

Answer 2

There is no such library. You'll have to write the 20 lines of code to do it yourself:

int length = s.length(); // get the length
int alphaCount;
for( int i=0; i<length; i ++ ) {
    char c = s.charAt(i);
    alphaCount += toInt( Character.isAlpha( c ) );
    ...
}

with

int toInt( boolean b ) { return b ? 1 : 0; }

Answer 3

You can take a look at:

• .length() property to get the amount of characters in a given String.
• .isLetter(Char ch) to check if a character within a string is a letter.
• .isUpperCase(Char ch) to check if a character is upper case.