charAt problem

[tangel]

The point is that if i feed it a name with a first and last name, it should find the space and return everything after the space... but i keep getting an error Dr. Java. Am i using charAt correctly?

If somebody could help me with this it would be kindly noted. Thank you!

here is the code:


public static String getLastName(String author)
{

int space =author.charAt(" ");

String lastName=author.substring(space+1);

return lastName;

}

[mwr1976]

no you are not using the method correctly. The parameter for the charAt() method is an int not a char. It takes the index and returns a char.

[JosAH]

I think you want to use the indexOf( ... ) method; read the API documentation for the String class and you know everything.

kind regards,

Jos

[tnrh1]

The CharAt method returns the char at the index you mention.
For exmaple:
st = "abcd";
st.CharAt(2) equals to "c" .

As josAH said, I think you mean IndexOf, anyway you still can do it with CharAt:

run a loop on the whole string checking each char if it equals to " " .
if found return the index of the next char (last name start). // "john smith" that should return 5 (make sure you count from 0!).
else return -1

Then check the returned value,
if >-1
cut the string from the returned value till the end (st.length()) you might ask why not length()-1? the SubString method cuts from x to y-1.
Check this page to get more information: String (Java 2 Platform SE v1.4.2)

[tangel]

I was unsure of what you meant by API documentation until tnrh1 posted the link. It's super helpful! I'm a newbie at Java so thank you very much! It works now.