java-首字母大小写

/**
* 首字母小写
*
* @param str
* @return
*/
public static String toLowerCaseFirstChar(String s) {
if (Character.isLowerCase(s.charAt(0)))
return s;
else
return (new StringBuilder())
.append(Character.toLowerCase(s.charAt(0)))
.append(s.substring(1)).toString();
}

/**
* 首字母大写
*
* @param str
* @return
*/
public static String toUpperCaseFirstChar(String s) {
if (Character.isUpperCase(s.charAt(0)))
return s;
else
return (new StringBuilder())
.append(Character.toUpperCase(s.charAt(0)))
.append(s.substring(1)).toString();
}