Question

是否有可用的内置方法将字符串转换为Title Case格式？

Answer 1

Apache Commons StringUtils.capitalize()或WordUtils.capitalize()

例如：来自WordUtils doc

的WordUtils.capitalize("i am FINE") = "I Am FINE"

Answer 2

String类中没有capitalize（）或titleCase（）方法。你有两个选择：

使用commons lang string utils。

 StringUtils.capitalize(null)  = null
 StringUtils.capitalize("")    = ""
 StringUtils.capitalize("cat") = "Cat"
 StringUtils.capitalize("cAt") = "CAt"
 StringUtils.capitalize("'cat'") = "'cat'"

编写（又一个）静态帮助方法toTitleCase（）

示例实施

public static String toTitleCase(String input) {
    StringBuilder titleCase = new StringBuilder(input.lenght());
    boolean nextTitleCase = true;

    for (char c : input.toCharArray()) {
        if (Character.isSpaceChar(c)) {
            nextTitleCase = true;
        } else if (nextTitleCase) {
            c = Character.toTitleCase(c);
            nextTitleCase = false;
        }

        titleCase.append(c);
    }

    return titleCase.toString();
}

测试用例

    System.out.println(toTitleCase("string"));
    System.out.println(toTitleCase("another string"));
    System.out.println(toTitleCase("YET ANOTHER STRING"));

输出：

String
Another String
YET ANOTHER STRING

Answer 3

如果我可以提交解决方案......

以下方法基于dfa发布的方法。它进行了以下主要更改（适用于我当时需要的解决方案）：它会强制输入字符串中的所有字符为小写，除非它后面紧跟一个“可操作的分隔符”，在这种情况下，字符被强制转换为大写。

我的例程的一个主要限制是它假设“标题大小写”是为所有语言环境统一定义的，并且由我使用的相同案例约定表示，因此在这方面它不如dfa的代码有用。

public static String toDisplayCase(String s) {

    final String ACTIONABLE_DELIMITERS = " '-/"; // these cause the character following
                                                 // to be capitalized

    StringBuilder sb = new StringBuilder();
    boolean capNext = true;

    for (char c : s.toCharArray()) {
        c = (capNext)
                ? Character.toUpperCase(c)
                : Character.toLowerCase(c);
        sb.append(c);
        capNext = (ACTIONABLE_DELIMITERS.indexOf((int) c) >= 0); // explicit cast not needed
    }
    return sb.toString();
}

测试值

一个字符串

maRTin o'maLLEY

john wilkes-booth

另一个字符串

<强> OUTPUTS

字符串

Martin O'Malley

John Wilkes-Booth

又一个字符串

Answer 4

使用Apache Commons的WordUtils.capitalizeFully()。

WordUtils.capitalizeFully(null)        = null
WordUtils.capitalizeFully("")          = ""
WordUtils.capitalizeFully("i am FINE") = "I Am Fine"

Answer 5

你可以像这样使用apache commons langs：

WordUtils.capitalizeFully("this is a text to be capitalize")

你可以在这里找到java doc： WordUtils.capitalizeFully java doc

如果你想删除世界之间的空格，你可以使用：

StringUtils.remove(WordUtils.capitalizeFully("this is a text to be capitalize")," ")

你可以找到String的java文档 StringUtils.remove java doc

我希望这有帮助。

Answer 6

如果您想根据最新的Unicode标准获得正确答案，则应使用icu4j。

config.ldap_auth_username_builder = Proc.new() {|attribute, login, ldap| "#{login}@mydomain.com"}

请注意，这是区域设置敏感的。

Api Documentation

Implementation

Answer 7

这是我写的将snake_case转换为lowerCamelCase但可以根据需要轻松调整的内容

private String convertToLowerCamel(String startingText)
{
    String[] parts = startingText.split("_");
    return parts[0].toLowerCase() + Arrays.stream(parts)
                    .skip(1)
                    .map(part -> part.substring(0, 1).toUpperCase() + part.substring(1).toLowerCase())
                    .collect(Collectors.joining());
}

Answer 8

这是根据@ dfa和@ scottb的答案处理任何非字母/数字字符的另一种观点：

public final class TitleCase {

    public static String toTitleCase(String input) {

        StringBuilder titleCase = new StringBuilder();
        boolean nextTitleCase = true;

        for (char c : input.toLowerCase().toCharArray()) {
            if (!Character.isLetterOrDigit(c)) {
                nextTitleCase = true;
            } else if (nextTitleCase) {
                c = Character.toTitleCase(c);
                nextTitleCase = false;
            }
            titleCase.append(c);
        }

        return titleCase.toString();
    }

}

给定输入：

MARYÄNNO'CONNEŽ-ŠUSLIK

输出

MaryÄnnO'Connež-Šuslik

Answer 9

我知道这是较旧的，但没有简单的答案，我需要这种方法来编码，所以我在这里添加，简单易用。

public static String toTitleCase(String input) {
    input = input.toLowerCase();
    char c =  input.charAt(0);
    String s = new String("" + c);
    String f = s.toUpperCase();
    return f + input.substring(1);
}

Answer 10

使用此方法将字符串转换为首字母大写：

static String toTitleCase(String word) {
    return Stream.of(word.split(" "))
            .map(w -> w.toUpperCase().charAt(0)+ w.toLowerCase().substring(1))
            .reduce((s, s2) -> s + " " + s2).orElse("");
}

Answer 11

我遇到了这个问题，我进行了搜索然后我使用一些Java关键字制作了自己的方法只需将String变量作为参数传递，并以正确的标题String形式获取输出。

public class Main
{
  public static void main (String[]args)
  {
    String st = "pARVeEN sISHOsIYA";
    String mainn = getTitleCase (st);
      System.out.println (mainn);
  }


  public static String getTitleCase(String input)
  {
    StringBuilder titleCase = new StringBuilder (input.length());
    boolean hadSpace = false;
    for (char c:input.toCharArray ()){
        if(Character.isSpaceChar(c)){
            hadSpace = true;
            titleCase.append (c);
            continue;
        }
        if(hadSpace){
            hadSpace = false;
            c = Character.toUpperCase(c);
            titleCase.append (c);
        }else{
            c = Character.toLowerCase(c);
            titleCase.append (c);
        }
    }
    String temp=titleCase.toString ();
    StringBuilder titleCase1 = new StringBuilder (temp.length ());
    int num=1;
    for (char c:temp.toCharArray ())
        {   if(num==1)
            c = Character.toUpperCase(c);
            titleCase1.append (c);
            num=0;
        }
        return titleCase1.toString ();
    }
}

Answer 12

你可以很好地使用

org.apache.commons.lang.WordUtils

或

CaseFormat

来自Google的API。

Answer 13

我最近遇到了这个问题，不幸的是，很多名字出现在Mc和Mac的开头，我最终使用了scottb代码的一个版本，我改为处理这些前缀，所以它就在这里以防万一有人想要使用它。

仍然存在边缘情况，但是可能发生的最糟糕的事情是，当一个字母应该大写时，它将是小写字母。

/**
 * Get a nicely formatted representation of the name. 
 * Don't send this the whole name at once, instead send it the components.<br>
 * For example: andrew macnamara would be returned as:<br>
 * Andrew Macnamara if processed as a single string<br>
 * Andrew MacNamara if processed as 2 strings.
 * @param name
 * @return correctly formatted name
 */
public static String getNameTitleCase (String name) {
    final String ACTIONABLE_DELIMITERS = " '-/";
    StringBuilder sb = new StringBuilder();
    if (name !=null && !name.isEmpty()){                
        boolean capitaliseNext = true;
        for (char c : name.toCharArray()) {
            c = (capitaliseNext)?Character.toUpperCase(c):Character.toLowerCase(c);
            sb.append(c);
            capitaliseNext = (ACTIONABLE_DELIMITERS.indexOf((int) c) >= 0);
        }                       
        name = sb.toString();    
        if (name.startsWith("Mc") && name.length() > 2 ) {
            char c = name.charAt(2);
            if (ACTIONABLE_DELIMITERS.indexOf((int) c) < 0) {
                sb = new StringBuilder();
                sb.append (name.substring(0,2));
                sb.append (name.substring(2,3).toUpperCase());
                sb.append (name.substring(3));
                name=sb.toString();
            }               
        } else if (name.startsWith("Mac") && name.length() > 3) {
            char c = name.charAt(3);
            if (ACTIONABLE_DELIMITERS.indexOf((int) c) < 0) {
                sb = new StringBuilder();
                sb.append (name.substring(0,3));
                sb.append (name.substring(3,4).toUpperCase());
                sb.append (name.substring(4));
                name=sb.toString();
            }
        }
    }
    return name;    
}

Answer 14

转换为正确的标题案例：

String s= "ThiS iS SomE Text";
String[] arr = s.split(" ");
s = "";
for (String s1 : arr) {
    s += WordUtils.capitalize(s1.toLowerCase()) + " ";
}
s = s.substring(0, s.length() - 1);

结果：“这是一些文字”

Answer 15

我需要一个标题大小写转换器来转换任何包含驼峰式大小写，空格，数字和其他字符的字符串。但是没有可用的解决方案。最后，我为自己建造了一个。

/*
 * Copyright (C) 2018 Sudipto Chandra
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * Convert a string to title case in java (with tests).
 *
 * @author Sudipto Chandra
 */
public abstract class TitleCase {

    /**
     * Returns the character type. <br>
     * <br>
     * Digit = 2 <br>
     * Lower case alphabet = 0 <br>
     * Uppercase case alphabet = 1 <br>
     * All else = -1.
     *
     * @param ch
     * @return
     */
    private static int getCharType(char ch) {
        if (Character.isLowerCase(ch)) {
            return 0;
        } else if (Character.isUpperCase(ch)) {
            return 1;
        } else if (Character.isDigit(ch)) {
            return 2;
        }
        return -1;
    }

    /**
     * Converts any given string in camel or snake case to title case.
     * <br>
     * It uses the method getCharType and ignore any character that falls in
     * negative character type category. It separates two alphabets of not-equal
     * cases with a space. It accepts numbers and append it to the currently
     * running group, and puts a space at the end.
     * <br>
     * If the result is empty after the operations, original string is returned.
     *
     * @param text the text to be converted.
     * @return a title cased string
     */
    public static String titleCase(String text) {
        if (text == null || text.length() == 0) {
            return text;
        }

        char[] str = text.toCharArray();
        StringBuilder sb = new StringBuilder();

        boolean capRepeated = false;
        for (int i = 0, prev = -1, next; i < str.length; ++i, prev = next) {
            next = getCharType(str[i]);
            // trace consecutive capital cases
            if (prev == 1 && next == 1) {
                capRepeated = true;
            } else if (next != 0) {
                capRepeated = false;
            }
            // next is ignorable
            if (next == -1) {
                // System.out.printf("case 0, %d %d %s\n", prev, next, sb.toString());
                continue; // does not append anything
            }
            // prev and next are of same type
            if (prev == next) {
                sb.append(str[i]);
                // System.out.printf("case 1, %d %d %s\n", prev, next, sb.toString());
                continue;
            }
            // next is not an alphabet
            if (next == 2) {
                sb.append(str[i]);
                // System.out.printf("case 2, %d %d %s\n", prev, next, sb.toString());
                continue;
            }
            // next is an alphabet, prev was not +
            // next is uppercase and prev was lowercase
            if (prev == -1 || prev == 2 || prev == 0) {
                if (sb.length() != 0) {
                    sb.append(' ');
                }
                sb.append(Character.toUpperCase(str[i]));
                // System.out.printf("case 3, %d %d %s\n", prev, next, sb.toString());
                continue;
            }
            // next is lowercase and prev was uppercase
            if (prev == 1) {
                if (capRepeated) {
                    sb.insert(sb.length() - 1, ' ');
                    capRepeated = false;
                }
                sb.append(str[i]);
                // System.out.printf("case 4, %d %d %s\n", prev, next, sb.toString());
            }
        }
        String output = sb.toString().trim();
        output = (output.length() == 0) ? text : output;
        //return output;

        // Capitalize all words (Optional)
        String[] result = output.split(" ");
        for (int i = 0; i < result.length; ++i) {
            result[i] = result[i].charAt(0) + result[i].substring(1).toLowerCase();
        }
        output = String.join(" ", result);
        return output;
    }

    /**
     * Test method for the titleCase() function.
     */
    public static void testTitleCase() {
        System.out.println("--------------- Title Case Tests --------------------");
        String[][] samples = {
            {null, null},
            {"", ""},
            {"a", "A"},
            {"aa", "Aa"},
            {"aaa", "Aaa"},
            {"aC", "A C"},
            {"AC", "Ac"},
            {"aCa", "A Ca"},
            {"ACa", "A Ca"},
            {"aCamel", "A Camel"},
            {"anCamel", "An Camel"},
            {"CamelCase", "Camel Case"},
            {"camelCase", "Camel Case"},
            {"snake_case", "Snake Case"},
            {"toCamelCaseString", "To Camel Case String"},
            {"toCAMELCase", "To Camel Case"},
            {"_under_the_scoreCamelWith_", "Under The Score Camel With"},
            {"ABDTest", "Abd Test"},
            {"title123Case", "Title123 Case"},
            {"expect11", "Expect11"},
            {"all0verMe3", "All0 Ver Me3"},
            {"___", "___"},
            {"__a__", "A"},
            {"_A_b_c____aa", "A B C Aa"},
            {"_get$It132done", "Get It132 Done"},
            {"_122_", "122"},
            {"_no112", "No112"},
            {"Case-13title", "Case13 Title"},
            {"-no-allow-", "No Allow"},
            {"_paren-_-allow--not!", "Paren Allow Not"},
            {"Other.Allow.--False?", "Other Allow False"},
            {"$39$ldl%LK3$lk_389$klnsl-32489  3 42034 ", "39 Ldl Lk3 Lk389 Klnsl32489342034"},
            {"tHis will BE MY EXAMple", "T His Will Be My Exa Mple"},
            {"stripEvery.damn-paren- -_now", "Strip Every Damn Paren Now"},
            {"getMe", "Get Me"},
            {"whatSthePoint", "What Sthe Point"},
            {"n0pe_aLoud", "N0 Pe A Loud"},
            {"canHave SpacesThere", "Can Have Spaces There"},
            {"  why_underScore exists  ", "Why Under Score Exists"},
            {"small-to-be-seen", "Small To Be Seen"},
            {"toCAMELCase", "To Camel Case"},
            {"_under_the_scoreCamelWith_", "Under The Score Camel With"},
            {"last one onTheList", "Last One On The List"}
        };
        int pass = 0;
        for (String[] inp : samples) {
            String out = titleCase(inp[0]);
            //String out = WordUtils.capitalizeFully(inp[0]);
            System.out.printf("TEST '%s'\nWANTS '%s'\nFOUND '%s'\n", inp[0], inp[1], out);
            boolean passed = (out == null ? inp[1] == null : out.equals(inp[1]));
            pass += passed ? 1 : 0;
            System.out.println(passed ? "-- PASS --" : "!! FAIL !!");
            System.out.println();
        }
        System.out.printf("\n%d Passed, %d Failed.\n", pass, samples.length - pass);
    }

    public static void main(String[] args) {
        // run tests
        testTitleCase();
    }
}

以下是一些输入内容：

aCamel
TitleCase
snake_case
fromCamelCASEString
ABCTest
expect11
_paren-_-allow--not!
  why_underScore   exists  
last one onTheList

我的输出：

A Camel
Title Case
Snake Case
From Camel Case String
Abc Test
Expect11
Paren Allow Not
Why Under Score Exists
Last One On The List

Answer 16

使用Spring的StringUtils：

org.springframework.util.StringUtils.capitalize(someText);

如果您已经在使用Spring，那么可以避免引入另一个框架。

Answer 17

在实际标题中似乎没有答案的格式：“如何找到理想的工作”，“杀死一只知更鸟”，等等，所以我做了自己的方法。最适合英语文本。

private final static Set<Character> TITLE_CASE_DELIMITERS = new HashSet<>();

  static {
    TITLE_CASE_DELIMITERS.add(' ');
    TITLE_CASE_DELIMITERS.add('.');
    TITLE_CASE_DELIMITERS.add(',');
    TITLE_CASE_DELIMITERS.add(';');
    TITLE_CASE_DELIMITERS.add('/');
    TITLE_CASE_DELIMITERS.add('-');
    TITLE_CASE_DELIMITERS.add('(');
    TITLE_CASE_DELIMITERS.add(')');
  }

  private final static Set<String> TITLE_SMALLCASED_WORDS = new HashSet<>();

  static {
    TITLE_SMALLCASED_WORDS.add("a");
    TITLE_SMALLCASED_WORDS.add("an");
    TITLE_SMALLCASED_WORDS.add("the");
    TITLE_SMALLCASED_WORDS.add("for");
    TITLE_SMALLCASED_WORDS.add("in");
    TITLE_SMALLCASED_WORDS.add("on");
    TITLE_SMALLCASED_WORDS.add("of");
    TITLE_SMALLCASED_WORDS.add("and");
    TITLE_SMALLCASED_WORDS.add("but");
    TITLE_SMALLCASED_WORDS.add("or");
    TITLE_SMALLCASED_WORDS.add("nor");
    TITLE_SMALLCASED_WORDS.add("to");
  }

  public static String toCapitalizedWord(String oneWord) {
    if (oneWord.length() < 1) {
      return oneWord.toUpperCase();
    }
    return "" + Character.toTitleCase(oneWord.charAt(0)) + oneWord.substring(1).toLowerCase();
  }

  public static String toTitledWord(String oneWord) {
    if (TITLE_SMALLCASED_WORDS.contains(oneWord.toLowerCase())) {
      return oneWord.toLowerCase();
    }
    return toCapitalizedWord(oneWord);
  }

  public static String toTitleCase(String str) {
    StringBuilder result = new StringBuilder();
    StringBuilder oneWord = new StringBuilder();

    char previousDelimiter = 'x';
    /* on start, always move to upper case */
    for (char c : str.toCharArray()) {
      if (TITLE_CASE_DELIMITERS.contains(c)) {
        if (previousDelimiter == '-' || previousDelimiter == 'x') {
          result.append(toCapitalizedWord(oneWord.toString()));
        } else {
          result.append(toTitledWord(oneWord.toString()));
        }
        oneWord.setLength(0);
        result.append(c);
        previousDelimiter = c;
      } else {
        oneWord.append(c);
      }
    }
    if (previousDelimiter == '-' || previousDelimiter == 'x') {
      result.append(toCapitalizedWord(oneWord.toString()));
    } else {
      result.append(toTitledWord(oneWord.toString()));
    }
    return result.toString();
  }

  public static void main(String[] args) {
    System.out.println(toTitleCase("one year in paris"));
    System.out.println(toTitleCase("How to Land Your Dream Job"));
  }

Answer 18

这是最简单的解决方案

    static void title(String a,String b){
    String ra = Character.toString(Character.toUpperCase(a.charAt(0)));
    String rb = Character.toString(Character.toUpperCase(b.charAt(0)));
    for(int i=1;i<a.length();i++){
        ra+=a.charAt(i);
    }
    for(int i=1;i<b.length();i++){
        rb+=b.charAt(i);
    }
    System.out.println(ra+" "+rb);

Answer 19

这应该有效：

String str="i like pancakes";
String arr[]=str.split(" ");
String strNew="";
for(String str1:arr)
{
    Character oldchar=str1.charAt(0);
    Character newchar=Character.toUpperCase(str1.charAt(0));
    strNew=strNew+str1.replace(oldchar,newchar)+" ";    
}
System.out.println(strNew);

Answer 20

将任何字符串转换为标题大小写的最简单方法是使用googles包org.apache.commons.lang.WordUtils

System.out.println(WordUtils.capitalizeFully("tHis will BE MY EXAMple"));

会导致这个

这将成为我的榜样

我不确定为什么它命名为＆＃34; capitalizeFully＆＃34;，实际上该功能并没有完整的资本结果，但无论如何，这就是我们需要的工具。

Answer 21

抱歉，我是初学者，所以我的编码习惯很糟糕！

public class TitleCase {

    String title(String sent)
    {   
        sent =sent.trim();
        sent = sent.toLowerCase();
        String[] str1=new String[sent.length()];
        for(int k=0;k<=str1.length-1;k++){
            str1[k]=sent.charAt(k)+"";
    }

        for(int i=0;i<=sent.length()-1;i++){
            if(i==0){
                String s= sent.charAt(i)+"";
                str1[i]=s.toUpperCase();
                }
            if(str1[i].equals(" ")){
                String s= sent.charAt(i+1)+"";
                str1[i+1]=s.toUpperCase();
                }

            System.out.print(str1[i]);
            }

        return "";
        }

    public static void main(String[] args) {
        TitleCase a = new TitleCase();
        System.out.println(a.title("   enter your Statement!"));
    }
}

字符串转换为Title Case

21 个答案:

示例实施

测试用例