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
package corejava.string.intern;
import java.io.DataInputStream;
import java.util.ArrayList;
/*
* wap to accept only 3 sentences and convert first character of each word into upper case
*/
public class Accept3Lines_FirstCharUppercase {
static String line;
static String words[];
static ArrayList<String> list=new ArrayList<String>();
/**
* @param args
*/
public static void main(String[] args) throws java.lang.Exception{
DataInputStream read=new DataInputStream(System.in);
System.out.println("Enter only three sentences");
int i=0;
while((line=read.readLine())!=null){
method(line); //main logic of the code
if((i++)==2){
break;
}
}
display();
System.out.println("\n End of the program");
}
/*
* this will display all the elements in an array
*/
public static void display(){
for(String display:list){
System.out.println(display);
}
}
/*
* this divide the line of string into words
* and first char of the each word is converted to upper case
* and to an array list
*/
public static void method(String lineParam){
words=line.split("\\s");
for(String s:words){
String result=s.substring(0,1).toUpperCase()+s.substring(1);
list.add(result);
}
}
}
其他回答
我需要做一个通用的toString(Object obj)帮助类函数，在那里我必须将字段名转换为方法名-传递对象的getXXX()。
下面是代码
/**
* @author DPARASOU
* Utility method to replace the first char of a string with uppercase but leave other chars as it is.
* ToString()
* @param inStr - String
* @return String
*/
public static String firstCaps(String inStr)
{
if (inStr != null && inStr.length() > 0)
{
char[] outStr = inStr.toCharArray();
outStr[0] = Character.toUpperCase(outStr[0]);
return String.valueOf(outStr);
}
else
return inStr;
}
我的toString()实用程序是这样的
public static String getToString(Object obj)
{
StringBuilder toString = new StringBuilder();
toString.append(obj.getClass().getSimpleName());
toString.append("[");
for(Field f : obj.getClass().getDeclaredFields())
{
toString.append(f.getName());
toString.append("=");
try{
//toString.append(f.get(obj)); //access privilege issue
toString.append(invokeGetter(obj, firstCaps(f.getName()), "get"));
}
catch(Exception e)
{
e.printStackTrace();
}
toString.append(", ");
}
toString.setCharAt(toString.length()-2, ']');
return toString.toString();
}
String toUpperCaseFirstLetterOnly(String str) {
String[] words = str.split(" ");
StringBuilder ret = new StringBuilder();
for(int i = 0; i < words.length; i++) {
ret.append(Character.toUpperCase(words[i].charAt(0)));
ret.append(words[i].substring(1));
if(i < words.length - 1) {
ret.append(' ');
}
}
return ret.toString();
}
String text="hello";
StringBuffer sb=new StringBuffer();
char[] ch=text.toCharArray();
for(int i=0;i<ch.length;i++){
if(i==0){
sb.append(Character.toUpperCase(ch[i]));
}
else{
sb.append(ch[i]);
}
}
text=sb.toString();
System.out.println(text);
}
我使用下面的函数。我认为它在性能上更快。
public static String capitalize(String text){
String c = (text != null)? text.trim() : "";
String[] words = c.split(" ");
String result = "";
for(String w : words){
result += (w.length() > 1? w.substring(0, 1).toUpperCase(Locale.US) + w.substring(1, w.length()).toLowerCase(Locale.US) : w) + " ";
}
return result.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”
