[ Java 常見問題 ] How to upper case every first letter of word in a string?

Source From Here 
Question 
I have a string: "hello good old world" and i want to upper case every first letter of every word, not the whole string with .toUpperCase(). Is there an existing java helper which does the job? 

How-To 
Have a look at ACL (Apache Common Lang Library) WordUtils. Below is sample code: (commons-lang-2.6) 

view plaincopy to clipboardprint?

1. import org.apache.commons.lang.WordUtils  
2.   
3. String str = "hello good old-world. Nice to meet you!"  
4. printf("capitalize(str)=%s\n", WordUtils.capitalize(str))  
5. printf("capitalize(str)=%s\n", WordUtils.capitalize(str, (char)'-', (char)' '))  
6. printf("capitalizeFully(str)=%s\n", WordUtils.capitalizeFully(str))  
7. printf("capitalizeFully(str)=%s\n", WordUtils.capitalizeFully(str, (char)'-', (char)' '))  

Execution result: 

capitalize(str)=Hello Good Old-world. Nice To Meet You!
capitalize(str)=Hello Good Old-World. Nice To Meet You!
capitalizeFully(str)=Hello Good Old-world. Nice To Meet You!
capitalizeFully(str)=Hello Good Old-World. Nice To Meet You!

If you want to implement your capitalize function, check below sample groovy code: 

view plaincopy to clipboardprint?

1. def myCapitalize(str)  
2. {  
3.     def isWord=false  
4.     def chars=[]  
5.     str.each{ ch->  
6.         ch = (char)ch         
7.         switch((int)ch){  
8.             case 97..122: // a-z  
9.                 if(isWord)  
10.                 {                     
11.                     chars << ch  
12.                 }  
13.                 else  
14.                 {  
15.                     isWord=true                   
16.                     chars << (char)(ch-32)  
17.                 }  
18.                 break  
19.             case 65..90: // A-Z  
20.                 if(isWord)  
21.                 {                 
22.                     chars << ch  
23.                 }  
24.                 else  
25.                 {                     
26.                     isWord=true  
27.                     chars << ch  
28.                 }  
29.                 break   
30.             case 32:  
31.                 isWord=false                  
32.             default:                  
33.                 chars << ch                 
34.         }  
35.     }  
36.     return new String(chars.toArray() as char[])  
37. }  
38. String str = "hello good old-world. Nice to meet you!"  
39. printf("myCapitalize(str)=%s\n", myCapitalize(str))  

Execution result: 

myCapitalize(str)=Hello Good Old-world. Nice To Meet You!

Supplement 
* Wiki - ASCII Table (American Standard Code for Inf...mation Interchange，美國資訊交換標準代碼)