compare strings

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2 total messages Started by AKsteve Thu, 04 Mar 2004 07:27

#102

Author: AKsteve
Date: Thu, 04 Mar 2004 07:27

17 lines
1352 bytes

I am trying to compare two strings.

If the username and password matches what I have stored then great... looks
like this:
if (user.equalsIgnoreCase("Steve") && password.equals("iscool"))

how do I check to see if it "does not equal" what I have stored.

In other words, how do I check to see if a string does not equal another
string. (Yeah, I know an if else statement could do it, but is there a
simpler way - like .notequals)

I want the program to check the username and password until it is entered
correctly. I am using do/while.
This is for a class assignment

Steve

Re: compare strings

#103

Author: Joshua King
Date: Thu, 04 Mar 2004 10:12

37 lines
2292 bytes

In <104dmijn8e95nfc@corp.supernews.com> AKsteve wrote:
> I am trying to compare two strings.
> 
> If the username and password matches what I have stored then great... 
> looks like this: if (user.equalsIgnoreCase("Steve") && password.equals(
> "iscool"))
>
> how do I check to see if it "does not equal" what I have stored.
> 
> In other words, how do I check to see if a string does not equal 
> another string. (Yeah, I know an if else statement could do it, but is 
> there a simpler way - like .notequals)
>
> I want the program to check the username and password until it is 
> entered correctly. I am using do/while. This is for a class assignment
> 
> Steve

To check does not equal, you simply have to get the opposite by 
inverting
the result from equals.

You need to use the NOT operator, which is ! (the exclamation mark).

It has the effect of flipping the result of a boolean expression, so
your example becomes:

if (!password.equals("iscool")) {
	System.out.println("Invalid password!");
..

Note the exclamtion mark. If password is NOT "iscool" the equals method
returns false, which becomes true after the ! operator, and triggers the 
if
statement.

Joshua King

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