我使用Java从用户获得一个字符串输入。我试着让输入的第一个字母大写。
我试了一下:
String name;
BufferedReader br = new InputStreamReader(System.in);
String s1 = name.charAt(0).toUppercase());
System.out.println(s1 + name.substring(1));
这导致了以下编译错误:
类型不匹配:不能从InputStreamReader转换为BufferedReader 不能在基本类型char上调用toUppercase()
当前回答
这只是为了告诉你，你没有错。
BufferedReader br = new InputstreamReader(System.in);
// Assuming name is not blank
String name = br.readLine();
//No more error telling that you cant convert char to string
String s1 = (""+name.charAt(0)).toUppercase());
// Or, as Carlos prefers. See the comments to this post.
String s1 = Character.toString(name.charAt(0)).toUppercase());
System.out.println(s1+name.substring(1));
注意:这根本不是最好的方法。这只是为了告诉OP，它也可以使用charAt()来完成。；）
其他回答
StringUtils.capitalize(..) from commons-lang
我发布的代码将从字符串中删除下划线(_)符号和额外的空格，而且它将大写字符串中每个新词的第一个字母
private String capitalize(String txt){
List<String> finalTxt=new ArrayList<>();
if(txt.contains("_")){
txt=txt.replace("_"," ");
}
if(txt.contains(" ") && txt.length()>1){
String[] tSS=txt.split(" ");
for(String tSSV:tSS){ finalTxt.add(capitalize(tSSV)); }
}
if(finalTxt.size()>0){
txt="";
for(String s:finalTxt){ txt+=s+" "; }
}
if(txt.endsWith(" ") && txt.length()>1){
txt=txt.substring(0, (txt.length()-1));
return txt;
}
txt = txt.substring(0,1).toUpperCase() + txt.substring(1).toLowerCase();
return txt;
}
String s = "first second third fourth";
int j = 0;
for (int i = 0; i < s.length(); i++) {
if ((s.substring(j, i).endsWith(" "))) {
String s2 = s.substring(j, i);
System.out.println(Character.toUpperCase(s.charAt(j))+s2.substring(1));
j = i;
}
}
System.out.println(Character.toUpperCase(s.charAt(j))+s.substring(j+1));
String str = "java";
String cap = str.substring(0, 1).toUpperCase() + str.substring(1);
// cap = "Java"
用你的例子:
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
// Actually use the Reader
String name = br.readLine();
// Don't mistake String object with a Character object
String s1 = name.substring(0, 1).toUpperCase();
String nameCapitalized = s1 + name.substring(1);
System.out.println(nameCapitalized);
}
public static String capitalizer(final String texto) {
// split words
String[] palavras = texto.split(" ");
StringBuilder sb = new StringBuilder();
// list of word exceptions
List<String> excessoes = new ArrayList<String>(Arrays.asList("de", "da", "das", "do", "dos", "na", "nas", "no", "nos", "a", "e", "o", "em", "com"));
for (String palavra : palavras) {
if (excessoes.contains(palavra.toLowerCase()))
sb.append(palavra.toLowerCase()).append(" ");
else
sb.append(Character.toUpperCase(palavra.charAt(0))).append(palavra.substring(1).toLowerCase()).append(" ");
}
return sb.toString().trim();
}
