Re: Change decimal color code on the fly

From:

Nigel Wade <nmw@ion.le.ac.uk>

Newsgroups:

comp.lang.java.help

Date:

Fri, 16 Nov 2012 16:52:25 +0000

Message-ID:

<agn9a9FkggU1@mid.individual.net>

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