Java中是否内置了一个函数，使字符串中每个单词的第一个字符大写，而不影响其他字符?
例子:
乔恩·斯基特->乔恩·斯基特 miles o'Brien -> miles o'Brien (B仍然是大写，这排除了Title Case) 老麦当劳->
*(老麦当劳也会被发现，但我不指望它有那么聪明。)
快速浏览一下Java字符串文档就会发现只有toUpperCase()和toLowerCase()，它们当然没有提供所需的行为。当然，谷歌的结果主要是这两个函数。它看起来像一个已经被发明出来的轮子，所以问一下也无妨，这样我以后就可以用它了。
当前回答
来自Java 9+
你可以像这样使用String::replaceAll:
public static void upperCaseAllFirstCharacter(String text) {
String regex = "\\b(.)(.*?)\\b";
String result = Pattern.compile(regex).matcher(text).replaceAll(
matche -> matche.group(1).toUpperCase() + matche.group(2)
);
System.out.println(result);
}
例子:
upperCaseAllFirstCharacter("hello this is Just a test");
输出
Hello This Is Just A Test
其他回答
这条适用于姓氏的情况……
使用不同类型的分隔符，并且它保持相同的分隔符:
jean-frederic -> jean-frederic jean frederic——> jean frederic
该代码与GWT客户端一起工作。
public static String capitalize (String givenString) {
String Separateur = " ,.-;";
StringBuffer sb = new StringBuffer();
boolean ToCap = true;
for (int i = 0; i < givenString.length(); i++) {
if (ToCap)
sb.append(Character.toUpperCase(givenString.charAt(i)));
else
sb.append(Character.toLowerCase(givenString.charAt(i)));
if (Separateur.indexOf(givenString.charAt(i)) >=0)
ToCap = true;
else
ToCap = false;
}
return sb.toString().trim();
}
我做了这个小类，可以用来大写一个句子中的每个单词。如果不是空格，可以更改字符串中的单词分隔符。
package com.ecnews.ecnews_v01.Helpers;
public class Capitalize {
String sentence;
String separator = " ";
public Capitalize(String sentence) {
this.sentence = sentence;
}
public void setSeparator(String separator) {
this.separator = separator;
}
public String getCapitalized() {
StringBuilder capitalized = new StringBuilder("");
for (String word : sentence.split(separator)) {
capitalized.append(separator+Character.toUpperCase(word.charAt(0)) + word.substring(1));
}
return capitalized.toString().trim();
}
}
例子:
String sourceName = new Capitalize("this is a test"). get资本化();
sourceName将是“This Is A Test”
下面是这个问题的Kotlin版本:
fun capitalizeFirstLetterOfEveryWord(text: String): String
{
if (text.isEmpty() || text.isBlank())
{
return ""
}
if (text.length == 1)
{
return Character.toUpperCase(text[0]).toString()
}
val textArray = text.split(" ")
val stringBuilder = StringBuilder()
for ((index, item) in textArray.withIndex())
{
// If item is empty string, continue to next item
if (item.isEmpty())
{
continue
}
stringBuilder
.append(Character.toUpperCase(item[0]))
// If the item has only one character then continue to next item because we have already capitalized it.
if (item.length == 1)
{
continue
}
for (i in 1 until item.length)
{
stringBuilder
.append(Character.toLowerCase(item[i]))
}
if (index < textArray.lastIndex)
{
stringBuilder
.append(" ")
}
}
return stringBuilder.toString()
}
如果你更喜欢番石榴……
String myString = ...;
String capWords = Joiner.on(' ').join(Iterables.transform(Splitter.on(' ').omitEmptyStrings().split(myString), new Function<String, String>() {
public String apply(String input) {
return Character.toUpperCase(input.charAt(0)) + input.substring(1);
}
}));
public static String toTitleCase(String word){
return Character.toUpperCase(word.charAt(0)) + word.substring(1);
}
public static void main(String[] args){
String phrase = "this is to be title cased";
String[] splitPhrase = phrase.split(" ");
String result = "";
for(String word: splitPhrase){
result += toTitleCase(word) + " ";
}
System.out.println(result.trim());
}
