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

看一下ACL WordUtils。

WordUtils。大写("your string") == "your string"

如何大写单词的第一个字母在一个字符串?

其他回答

StringUtils.capitalize(..) from commons-lang

那么wordutils . capitalizately()呢?

import org.apache.commons.lang3.text.WordUtils;

public class Main {

    public static void main(String[] args) {

        final String str1 = "HELLO WORLD";
        System.out.println(capitalizeFirstLetter(str1)); // output: Hello World

        final String str2 = "Hello WORLD";
        System.out.println(capitalizeFirstLetter(str2)); // output: Hello World

        final String str3 = "hello world";
        System.out.println(capitalizeFirstLetter(str3)); // output: Hello World

        final String str4 = "heLLo wORld";
        System.out.println(capitalizeFirstLetter(str4)); // output: Hello World
    }

    private static String capitalizeFirstLetter(String str) {
        return WordUtils.capitalizeFully(str);
    }
}
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);
}

那些谁搜索首字母大写的名字在这里..

public static String capitaliseName(String name) {
    String collect[] = name.split(" ");
    String returnName = "";
    for (int i = 0; i < collect.length; i++) {
        collect[i] = collect[i].trim().toLowerCase();
        if (collect[i].isEmpty() == false) {
            returnName = returnName + collect[i].substring(0, 1).toUpperCase() + collect[i].substring(1) + " ";
        }
    }
    return returnName.trim();
}

usase: capitaliseName(“saurav khan”); 输出:Saurav Khan

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();
}