Checking if the first character of a string is lower case

Question

I am trying figure out how to change the character at position 0 of a string to uppercase if it is lower case. I am sorry if this is a dumb question, but it is stumping me. Something like this:

String myString = "hello";
if( //string position 0 is lowercase )
{
    char myChar = myString.charAt(0);
    myChar.toUpperCase();
}

I think .toUpperCase() only works for strings though. Any help would be appreciated!

This question is duplicated with https://stackoverflow.com/q/5725892/3057249 — Bruno Carneiro, Mar 06 '19 at 00:40
Dang didn't realize it @BrunoCarneiro, Thank you it helped me! — Harry Manback, Mar 06 '19 at 00:48

score 0 · Answer 1 · answered Mar 06 '19 at 00:46

0

You can use Character.isUpperCase() to check if a character is upper case.

You can use Character.toUpperCase() to convert a single character to upper case.

answered Mar 06 '19 at 00:46

tehp

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Feras AlSaffar · Answer 2 · 2019-03-06T01:01:42.460

0

Think of changing myString to a char array and working it from that. The Character package in Java has some helpful functions:

String myString = "hello";
char[] sArr = myString.toCharArray();

sArr[0] = Character.toUpperCase(sArr[0]);

myString = new String(sArr);

EDIT: As pointed out by Scary Wombat, there is no need to check if the first char is upper or not. Simply call the Character.toUpperCase(sArr[0]). Whether it is upper or not doesn't effect the outcome.

edited Mar 06 '19 at 01:01

answered Mar 06 '19 at 00:46

Feras AlSaffar

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why bother testing if the char is lowercase? – Scary Wombat Mar 06 '19 at 00:49
He specified in the question: I am trying figure out how to change the character at position 0 of a string to uppercase if it is lower case. – Feras AlSaffar Mar 06 '19 at 00:54
yes, but you could have cleaner code by simply calling `sArr[0] = Character.toUpperCase(sArr[0]);` – Scary Wombat Mar 06 '19 at 00:56
Actually you are absolutely right – Feras AlSaffar Mar 06 '19 at 00:59

Checking if the first character of a string is lower case

2 Answers2