Java String首字母大写

一種寫法參考

public String upperFirstChar(String input) {
        if (input == null || "".equals(input)) {
            return input;
        }
        StringBuffer buff = new StringBuffer();
        char[] bs = input.toCharArray();
        for (int i = ; i < bs.length; i++) {
            if (i == ) {
                buff.append(String.valueOf(bs[]).toUpperCase());
                continue;
            }
            buff.append(bs[i]);
        }
        return buff.toString();
    }

還有一種參考：

    public String upperCase(String str) {
        if ((str == null) || (str.length() == ))
            return str;
        char[] ch = str.toCharArray();
        if (ch[] >= 'a' && ch[] <= 'z') {
            ch[] = (char) (ch[] - );
        }
        return new String(ch);
    }