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Change decimal color code on the fly

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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

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Change decimal color code on the fly Bob <bherbst65@hotmail.com> - 2012-11-16 08:05 -0800
  Re: Change decimal color code on the fly Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-16 11:49 -0500
  Re: Change decimal color code on the fly markspace <-@.> - 2012-11-16 08:50 -0800
  Re: Change decimal color code on the fly Nigel Wade <nmw@ion.le.ac.uk> - 2012-11-16 16:52 +0000
  Re: Change decimal color code on the fly Roedy Green <see_website@mindprod.com.invalid> - 2012-11-16 10:14 -0800
  Re: Change decimal color code on the fly Bob <bherbst65@hotmail.com> - 2012-11-16 10:39 -0800
    Re: Change decimal color code on the fly Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-16 13:56 -0500
  Re: Change decimal color code on the fly Bob <bherbst65@hotmail.com> - 2012-11-16 12:23 -0800
    Re: Change decimal color code on the fly Lew <lewbloch@gmail.com> - 2012-11-16 12:38 -0800
    Re: Change decimal color code on the fly Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-16 17:11 -0500

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