Converting strings to uppercase and using char at method

Question

i need to convert the first letter of a string of names to uppercase and using the charat method but not sure how to use the char at method

Answer 1

I'm not really sure on how charAt() could be really useful in your case, but you can try this :

String s = "yourString";
char firstCharInUpperCase = Character.toUpperCase(s.charAt(0));
String yourNewString = new StringBuilder(s).setCharAt(0, firstCharInUpperCase).toString();

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Resources :

• Javadoc - String.charAt()
• Javadoc - Character.toUpperCase()
• Javadoc - StringBuilder.setCharAt()

Answer 2

Some points:

• Strings are immutable - i.e. you can't change their internal char array. So you have to make as many new strings as changes you perform on them. So better use a StringBuilder and append() to it for better performance.
• You can iterate the string from 0 to length() and check if i == 0 (beginning of string) or, with charAt(..) whether the previous is a space (charAt(i-1) == ' ')
• for those cases use Character.toUpperCase(c). Append each char to the StringBuilder, either the original, or the capitalized one.
• finally call toString() of the StringBuilder to get the desired capitalized String

That way, for "james a. gosling" you will get "James A. Gosling"