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Java Discussion Thread
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Oct 13th, 2009

boolean return problem

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Hey guys, I have one stupid problem with the return value of one function... this is my code:

Java Syntax (Toggle Plain Text)
	private boolean check(String mail, int N){
                               // mail = The mail
                               // N = The sum of the characters before the @ and including it him
		if(mail.substring(N) == "hotmail.com" || mail.substring(N) == "live.com" ||
				mail.substring(N) == "msn.com" || mail.substring(N) == "yahoo.com" ||
				mail.substring(N) == "gmail.com"){
			return true;
		} else {
			return false;
		}
	}
	private boolean check(String mail, int N){
                               // mail = The mail
                               // N = The sum of the characters before the @ and including it him
		if(mail.substring(N) == "hotmail.com" || mail.substring(N) == "live.com" ||
				mail.substring(N) == "msn.com" || mail.substring(N) == "yahoo.com" ||
				mail.substring(N) == "gmail.com"){
			return true;
		} else {
			return false;
		}
	}

...and if the mail is daniweb@hotmail.com then mail.substring(N) will be hotmail.com but the return value will be false.

Where is my mistake?

Thanks.

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Krstevski

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Oct 13th, 2009

Re: boolean return problem

The == operator does not compare the characters of the string. It checks to see if they are referring to the same object. Use the mail.substring(N).equals("hotmail.com") method to compare the characters (or equalsIgnoreCase() I think).

nmaillet

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Posting Whiz in Training

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Oct 13th, 2009

Re: boolean return problem

The problem is solved.

Thanks nmaillet.

Krstevski

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Oct 14th, 2009

Re: boolean return problem

Java Syntax (Toggle Plain Text)
if (some boolean expression) {
   return true;
} else {
   return false;
}
if (some boolean expression) {
   return true;
} else {
   return false;
}

is just the long way to say

Java Syntax (Toggle Plain Text)
return  (some boolean expression);
return  (some boolean expression);

JamesCherrill

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