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String.CompareTo exception error

 
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String.CompareTo exception error
wingz198
24 Jan, 2008 - 02:28 PM
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I have the code below to compare two strings and when I run it, the console shows a Null Pointer Exception. I've tried using a variable for the second string and a literal string and the same thing comes up.

//pcData is a string
if (pcData.compareTo(err) == 0){....}
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dontKnowJava
RE: String.CompareTo Exception Error
24 Jan, 2008 - 02:34 PM
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probably your err string is blank. heres an example
CODE

class aa    {
    public static void main(String args[])    {
        String a = "a";
        String b = "a";
        if(a.compareTo(b) == 0)
            System.out.println("strings a and b are the same");
        }
    }


This post has been edited by dontKnowJava: 24 Jan, 2008 - 02:36 PM
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PennyBoki
RE: String.CompareTo Exception Error
24 Jan, 2008 - 02:34 PM
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maybe you are comparing a string with null, can the function .compareTo() compare String object with null?
Check the API.
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baavgai
RE: String.CompareTo Exception Error
24 Jan, 2008 - 02:45 PM
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Chances are, pcData==null. It doesn't matter if err is null or not.
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dontKnowJava
RE: String.CompareTo Exception Error
24 Jan, 2008 - 03:08 PM
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QUOTE(baavgai @ 24 Jan, 2008 - 03:45 PM) *

Chances are, pcData==null. It doesn't matter if err is null or not.

i think it does. gave me same null pointer error on either being null
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baavgai
RE: String.CompareTo Exception Error
24 Jan, 2008 - 04:10 PM
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QUOTE(dontKnowJava @ 24 Jan, 2008 - 06:08 PM) *

QUOTE(baavgai @ 24 Jan, 2008 - 03:45 PM) *

Chances are, pcData==null. It doesn't matter if err is null or not.

i think it does. gave me same null pointer error on either being null



Oops, you are correct. Damn, Java just loves it's Exceptions. tongue.gif

I was thinking of C# when I posted, actually. I'll have to test that out in C# when I'm back on a Windows box.
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