How to convert string to mixed case

[Munish Dabra]

Is there any api which take the string and convert it to mixed case. If somthing is there in commons..that will work too.

Thanks
Munish

[Scott Selikoff]

Can you give an example of a mixed case format you want to use?
[ November 29, 2005: Message edited by: Scott Selikoff ]

[Munish Dabra]

basically sentence case

e.g. hI thIS iS StUPId QuesTIon

Output : This is stupid question

[Ernest Friedman-Hill]

Well, the following does it (if you first check that the String isn't null and is at least two characters long

s.substring(0, 1).toUpperCase() + s.substring(1).toLowerCase()

I'm sure someone could come up with a somewhat more efficient way to do it, but I doubt there's anything simpler.

[Munish Dabra]

i code like this , but didnt quite like it..any straithword commons api or better way to do it ?

if(str != null){
String[] sentences = StringUtils.split(str.toLowerCase(),'.');
for(int i=0;i<sentences.length;i++){
StringBuffer formattedSentence = new StringBuffer();
formattedSentence.append(StringUtils.left(sentences[i],1).toUpperCase());
formattedSentence.append(str.substring(1));
sentences[i] = formattedSentence.toString();
}
return StringUtils.join(sentences,'.');
}

[Jim Yingst]

EFH: That works for a one-character input, too.
[ November 29, 2005: Message edited by: Jim Yingst ]

[Paul Clapham]

So the rules are:

1. The first letter must be upper-case.

2. The first letter after '.' must be upper-case.

3. All other letters must be lower-case.

If so, then something like this: (not tested)

char[] chars = str.toCharArray();
boolean mustBeUpper = true;
for (int i=0; i<chars.length; i++) {
  if (mustBeUpper && Character.isLetter(chars[i])) {
    // This character must be upper-cased
    chars[i] = Character.toUpperCase(chars[i]);
    // but no more after this until we reach '.'
    mustBeUpper = false;
  } else {
    chars[i] = Character.toLowerCase(chars[i]));
  }
  if (chars[i] == '.') {
    // Next letter must be upper-cased
    mustBeUpper = true;
  }
}
str = new String(chars);

[Steve Fahlbusch]

Greetings All,

Your replies all seem to give a result, but i don't see how the same input, will give the same output with your code.

As i see it this assumes that there was a typo (or at least misrepresentation) of the test case (example).

[Jim Yingst]

Right, this assumes Munish merely forgot about the "hI " at the beginning of the original input.

[Munish Dabra]

yes guys , there was a little typo in the example.And final piece i think should be :

if(str != null && !str.trim().equalsIgnoreCase("")){
String[] sentences = StringUtils.split(str.trim().toLowerCase(),'.');
for(int i=0;i<sentences.length;i++){
sentences[i] = StringUtils.left(sentences[i].trim(),1).toUpperCase().concat(sentences[i].trim().substring(1));
}
return StringUtils.join(sentences,".").concat(".");
}
any comments !

[Scott Selikoff]

Anyone have a solution that uses java regular expressions? Just wondering, I don't use them enough to know for sure whether or not such a thing could be done.

To Munish: What about special words like a person's name, book title, important words, acronyms, etc. If you need to include any of those, formatting becomes much more difficult.
[ November 30, 2005: Message edited by: Scott Selikoff ]

[Munish Dabra]

True Scott , my code does n't take care of the special words like a person's name, book title, important words, acronyms etc.

But I couldn't think of anything to do that . Any Ideas ?