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
以下方法将所有字母转换为大写/小写，取决于它们靠近空格或其他特殊字符的位置。
public static String capitalizeString(String string) {
char[] chars = string.toLowerCase().toCharArray();
boolean found = false;
for (int i = 0; i < chars.length; i++) {
if (!found && Character.isLetter(chars[i])) {
chars[i] = Character.toUpperCase(chars[i]);
found = true;
} else if (Character.isWhitespace(chars[i]) || chars[i]=='.' || chars[i]=='\'') { // You can add other chars here
found = false;
}
}
return String.valueOf(chars);
}
其他回答
Simple answer by program:
public class StringCamelCase {
public static void main(String[] args) {
String[] articles = {"the ", "a ", "one ", "some ", "any "};
String[] result = new String[articles.length];
int i = 0;
for (String string : articles) {
result[i++] = toUpercaseForstChar(string);
}
for (String string : result) {
System.out.println(string);
}
}
public static String toUpercaseForstChar(String string){
return new String(new char[]{string.charAt(0)}).toUpperCase() + string.substring(1,string.length());
}
}
worddutil .capitalize(str) (from apache common -text)
(注意:如果你需要“fOO BAr”变成“fOO BAr”，那么用大写的(..)代替)
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()
}
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”
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);
}
}));
