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From: Nigel Wade <nmw@ion.le.ac.uk>
Newsgroups: comp.lang.java.help
Subject: Re: Change decimal color code on the fly
Date: Fri, 16 Nov 2012 16:52:25 +0000
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On 16/11/12 16:05, Bob wrote:
> Hi All,
> While making a datafile of decimal color pixel
> codes for a small image, I want to change
> a particular String number that will go into the datafile
> to a different String number.
> I am doing this before it is added to the
> ArrayList. It does not seem to work and I need
> to know why. Below is my test to identify
> the String number and looking for the "if"
> statement to recognize it"
>
> Here is a snip of my code:
> ....
>        mSet =   redStr +  greenStr +  blueStr;
>        System.out.println(mSet);//this is successful
>        mSetx= "255255255";
>
>        if (mSet ==  mSetx) {
>           System.out.println("yes, recognized");
>           //mSet = ("113000000");
>        }
>        colorpxl.add(mSet);// ArrayList
>        mSet = "";
>
> Thanks in advance for your response.
>
> Bob

You are using the wrong test. == tests for equality of the reference, 
not equality of what is referenced. It has no knowledge of String and 
cannot compare the actual contents of a String. All it does is compare 
the references mSet and mSetx. These refer to two different Strings, 
even though the Strings may contain the same sequence of characters, and 
therefore the test fails.

What you need is String.equals().

-- 
Nigel Wade