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Double.parseDouble behavior

Posted on 2004-04-02
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Last Modified: 2010-03-31
this is something I don't get...

I declared like this:
minXSinTField = new JTextField("0.0", 4);

and then I am using this func to test input validation.
isValidInput(minXSinTField);

This is the func.
  public boolean isValidInput(JTextField tf) {
    boolean result = true;
    try {
      Double.parseDouble(tf.getText());
      result = true;
      System.out.println("in try section");
      System.out.println(result);
    }
    catch (NumberFormatException ex) {
      result = false;
      System.out.println("in  catch section");
      System.out.println(result);
    }
    System.out.println("before return;");
    System.out.println(result);
    return result;
  }

Now, when I enter any string this func returns true.
From other pane's textfields, when I enter string this func returns false.

I don't know why...
0
Comment
Question by:dkim18
[X]
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7 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 10741405
Please post input
0
 
LVL 13

Expert Comment

by:Webstorm
ID: 10741411
Hi dkim18,


Try this:

  public boolean isValidInput(JTextField tf) {
    try {
      Double.parseDouble(tf.getText());
      return true;
    }
    catch (Exception ex) {
      return false;
    }
  }
0
 

Author Comment

by:dkim18
ID: 10741772
Webstorm,

when I entered string, it still returns true...

CHEJ,

minXSinTField = new JTextField("0.0", 4);

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LVL 13

Accepted Solution

by:
Webstorm earned 500 total points
ID: 10741858
Display the value returned by getText() :

  public boolean isValidInput(JTextField tf) {
    try {
      System.out.println("Input is ("+tf.getText()+")");
      Double.parseDouble(tf.getText());
      return true;
    }
    catch (Exception ex) {
      return false;
    }
  }
0
 

Author Comment

by:dkim18
ID: 10741929
when I enter string "input"
the outcome was:

Input is (0.0)
0
 

Author Comment

by:dkim18
ID: 10741950
I found error.
I am sharing same private members for two panes...
that was why...

thanks anyway,
0
 
LVL 13

Expert Comment

by:Webstorm
ID: 10742041
:-)
0

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