How to find string range

This is the code what i have typed. Its working but when i enter a value which is less then 0 and greater than 99, it still works, where as it shouldnt. Please help

public void focusLost(FocusEvent evt) {

if(evt.getSource() == mytextfield) {

System.out.println("Inside focuslost");

String text = mytextfield.getText();

if(text.startsWith("aa")) {

int value;

try {

value = Integer.parseInt(String.valueOf(text.charAt(text.length() - 1)));

}catch(NumberFormatException nfe) {JOptionPane.showMessageDialog(null,"textfield should be \n in the range of aa0 - aa99","Test",JOptionPane.ERROR_MESSAGE);return;}

if(value < 0 || value > 99) {

System.out.println("Inside if condition");

JOptionPane.showMessageDialog(null,"textfield should be \n in the range of aa0 - aa99","Test",JOptionPane.ERROR_MESSAGE);

mytextfield.transferFocus();

return;

}

}

else {

JOptionPane.showMessageDialog(null,"Invalid entry","Test",JOptionPane.ERROR_MESSAGE);

return;

}

}

}

ysrpa at 2007-7-12 10:32:08 >

Thanks for the tips. I have changed my code as follows

value = Integer.parseInt(String.valueOf(text.substring(text.lastIndexOf('a')+1,text.length())));

...

Also changed if condition to :

if(value < 0 && value > 99)

But still i get the same problem. If i enter values less 0 and greater than 99 its not entering if condition.

ysrpa at 2007-7-12 10:32:08 >

> Yeah i changed it to requestFocus(). And its keep

> displaying error message three times.

Make sure you didn't register your listener three times (we never know...)

> Even if i move to other application i get error messages.

> How can i display error message only once and within that

> application only if i click on other other fields

> when value is wrong.

From the [url=http://java.sun.com/javase/6/docs/api/java/awt/event/FocusEvent.html#isTemporary()]API doc[/url]:

There are two levels of focus events: permanent and temporary. Permanent focus change events occur when focus is directly moved from one Component to another, such as through a call to requestFocus() or as the user uses the TAB key to traverse Components. Temporary focus change events occur when focus is temporarily lost for a Component as the indirect result of another operation, such as Window deactivation or a Scrollbar drag. In this case, the original focus state will automatically be restored once that operation is finished, or, for the case of Window deactivation, when the Window is reactivated. Both permanent and temporary focus events are delivered using the FOCUS_GAINED and FOCUS_LOST event ids; the level may be distinguished in the event using the isTemporary() method.

TimTheEnchantora at 2007-7-12 10:32:08 >

> Try passing your focus request to the event queue:

> > SwingUtilities.invokeLater(new Runnable() {

>public void run() {

>mytextfield.requestFocus();

> }

> });

>

I didnt understand what you mean. You mean i have call invokeLater method in the place requestFocus() call.

ysrpa at 2007-7-21 21:21:46 >

> > Yeah i changed it to requestFocus(). And its keep

> > displaying error message three times.

>

> Make sure you didn't register your listener three

> times (we never know...)

>

No i have registered only once

> > Even if i move to other application i get error

> messages.

> > How can i display error message only once and

> within that

> > application only if i click on other other fields

> > when value is wrong.

>

> From the

> [url=http://java.sun.com/javase/6/docs/api/java/awt/ev

> ent/FocusEvent.html#isTemporary()]API doc[/url]:

> There are two levels of focus events: permanent and

> temporary. Permanent focus change events occur when

> focus is directly moved from one Component to

> another, such as through a call to requestFocus() or

> as the user uses the TAB key to traverse Components.

> Temporary focus change events occur when focus is

> temporarily lost for a Component as the indirect

> result of another operation, such as Window

> deactivation or a Scrollbar drag. In this case, the

> original focus state will automatically be restored

> once that operation is finished, or, for the case of

> Window deactivation, when the Window is reactivated.

> Both permanent and temporary focus events are

> delivered using the FOCUS_GAINED and FOCUS_LOST event

> ids; the level may be distinguished in the event

> using the isTemporary() method.

Ok i understood this. But how can this help me to solve my problem

ysrpa at 2007-7-21 21:21:46 >

> Ok i understood this. But how can this help me to solve my problem

Change

if(evt.getSource() == mytextfield) {

to

if ((evt.getSource() == mytextfield) && (!evt.isTemporary())) {

and

mytextfield.requestFocus();

to

SwingUtilities.invokeLater(new Runnable() {

public void run() {

mytextfield.requestFocus();

}

});

That should do it.

quittea at 2007-7-21 21:21:46 >