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pro_java thread: Re: Question on reading data from a textbox..


Message #1 by "Aaron Shettleroe" <jimslogan@y...> on Sun, 3 Feb 2002 02:58:40
GINO,
   I take it your using javax.swing.JTextField.  The snippet of code you
have there should work.  However, how are you finding your receiving NULL?
 According to the Java documentation a NullPointerException will be thrown
if the "underlying document is null".  Try to catch a NullPointerException
with something like this:
try
{
   String text = txtTextBoxName.getText();
}
catch(NullPointerException e)
{
   System.err.println("Ugh!  A null pointer exception!");
}

Are you comparing String references instead of string values?
You should compare strings like
// Check lexicographically where text follows "Another string"
String str = "Another string";
if(text.compareTo(str) > 0)
   // Do something...

NOT:
// Compare two string references to see if they reference the same object
// in memory.
String str = "Another string";
if(text == str)
   // Do something...

-Aaron


> This is my code that I'm using 
> 
> String text = txtTextBoxName.getText();
> 
> When I run it and enter something in the textbox. Its always NULL.
> It does get the value...
> GINO


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