Re: Pixelgrabber and Vectors, changes not happening.

Lew <lew@lewscanon.nospam>
Sat, 28 Jul 2007 00:38:03 -0400
bH wrote:

On Jul 27, 8:06 pm, Joshua Cranmer <> wrote:

On Fri, 27 Jul 2007 16:00:42 -0700, bH wrote:

    if (mSt == "000000"){

String == comparison only works under certain conditions that are not
true for about 95% of the cases.

The short answer:

Use "000000".equals(mSt) instead of mSt == "000000"

The long answer:

There is a long thread explaining this topic in full detail in the group, entitled "String.equals()" by Chameleon,
started on July 22, 2007.

Hi Joshua,

Thanks for your help.

First I discarded entirely:
 private String RestateClrLine (String mSt) {
    String res ="";
    System.out.println(mSt );
    if (mSt == "000000"){
      res = "ff0000";
    else {
      res = mSt;
 return res;

Revision as you have suggested:

      mSet = mSet + si;
       if ("000000".equals( mSet)) {
              mSet = "ff0000";

or this will also work

           mSet = mSet + si;
           if( mSet.equals("000000")) {
                mSet = "ff0000";

Thanks again,

The second form may in some applications require a separate check for
non-null-ness, actually an advantage in my book, and also recommended by the
knowledgeable Patricia Shanahan.

if ( mSet != null && mSet.equals("000000")) {

While some think this is too hard (whiners), Patricia has made the excellent
point that when null is a "Bad Thing", an explicit check for it emphasizes
that in a "literate code" way. The shortcutters argue that the first form
will yield "not equal" if mSet is null, so the job is done. I argue that null
is a special value, and should be treated as an out-of-band value nearly always.


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