在Java中，如何將字符串的所有單詞都轉換為句子大小寫？

Question

在Java中，如何將其轉換為：

little bo peep HAS LOST HER SHEEP And Doesn't Know WHERE to Find them

對此：

Little Bo Peep Has Lost Her Sheep And Doesn't Know Where To Find Them

Answer 1

來自公用語言的WordUtils.capitalizeFully（String input）

Answer 2

public static void main(String[] args) {

  String str = "little bo peep HAS LOST HER SHEEP And Doesn't Know WHERE to Find them";
  str = str.toLowerCase();
  final StringTokenizer st = new StringTokenizer(str, " ");
  final StringBuilder sb = new StringBuilder();

  while (st.hasMoreTokens()) {
   String token = st.nextToken();
   sb.append(Character.toUpperCase(token.charAt(0))
     + token.substring(1) + " ");
  }

  System.out.println(sb.toString().trim());
 }

Answer 3

或普通拆分版本：

public static String capWords(String s) {
    if (s == null && s.isEmpty()) {
        return s;
    } else {
        StringBuilder sb = new StringBuilder();
        for (String token : s.split(" ")) {
            if (token.isEmpty()) {
                if (sb.length() > 0) {
                    sb.append(" ");
                }
            } else {
                if (sb.length() > 0) {
                    sb.append(" ");
                }
                sb.append(Character.toUpperCase(token.charAt(0)));
                if (token.length() > 1) {
                    sb.append(token.substring(1).toLowerCase());
                }
            }
        }
        return sb.toString();
    }
}

注意 ：此版本還將修剪前導/后綴空格（可能不希望使用）

Answer 4

導入java.io. *;

ex3類

{

public static void main(String arg[])
{
    DataInputStream dis = new DataInputStream(System.in);
    try
    {
        System.out.println("ENTER THE STRING::");
        String s=dis.readLine();
        String res="";
        char fchar=Character.toUpperCase(s.charAt(0));
        res=res+fchar;
        for(int i=1;i<=s.length()-1;i++)
        {
                if(s.charAt(i)==' ')
                res=res+s.charAt(i);
                else if(s.charAt(i)=='.'||s.charAt(i)=='?'||s.charAt(i)=='!')
                {
                    res=res+s.charAt(i);
                    res=res+Character.toUpperCase(s.charAt(i+1));
                    i=i+1;
                }
                else 
                    res=res+Character.toLowerCase(s.charAt(i));
        }
        System.out.println(res);
    }
    catch(Exception e){}
}   

}

Answer 5

    private static String capitalize(String s){
        String str = s.toLowerCase();
        char[] c = str.toCharArray();

        c[0] = Character.toUpperCase(c[0]);
        return new String(c);
    }

    private static String format(String s){
        String[] splitted = s.split(" ");
        StringBuffer sb = new StringBuffer();

        for(int i=0, l = splitted.length; i < l; i++){
            if(splitted[i].trim().length() != 0){
                 sb.append(capitalize(splitted[i]) + " ");
            }

            if(i != l-1){
                 sb.append(" ");
            }
        }

        return sb.toString();
    }


    public static void main(String... args){

        System.out.println(format("little bo peep HAS LOST HER SHEEP And Doesn't Know WHERE to Find them"));

    }