Re: Java & XML

From:

Roedy Green <see_website@mindprod.com.invalid>

Newsgroups:

comp.lang.java.help

Date:

Wed, 20 Jan 2010 04:34:08 -0800

Message-ID:

<399bl5d8todpg7levhe2cfb0m4gnjhjfeh@4ax.com>

On Mon, 18 Jan 2010 22:23:39 -0800 (PST), aix five <aix530@gmail.com>
wrote, quoted or indirectly quoted someone who said :

Can anyone help me how to handle JAVA NullPointerException?
Is it possible to continue to run in "<>" as shown below?

Or I need to assign a new value if String A is null?
Please advice. Thanks.

String AA = getXMLInfo(XXX, "YY");

String A = myDate.convert(AA, inDateFormat, outDateFormat);

String BB = getXMLInfo(VVV, "UU");

String B = myDate.convert(BB, inDateFormat, outDateFormat);

catch (NullPointerException e)
   {
     System.out.println("main: Oops, null exception caught");
      <continue to run and assign
      A=B, C=D;>
   }

Your code gives Java programmers indigestion because you are ignoring
the naming conventions A and BB are normally class names, not variable
names. a and bb are variable names. See
http://mindprod.com/jgloss/codingconventions.html

you need
try { ... } catch ( NullPointerException e ) { recovery... }

Triggering an exception is a quite slow operation. So normally you
would handle it like this with explicit checks:

String a = (value != null) ? value : "huh?";

--
Roedy Green Canadian Mind Products
http://mindprod.com
Responsible Development is the style of development I aspire to now. It can be summarized by answering the question, ?How would I develop if it were my money?? I?m amazed how many theoretical arguments evaporate when faced with this question.
~ Kent Beck (born: 1961 age: 49) , evangelist for extreme programming .