AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TextField to accept only Integer values.          AppletTalk.com Forum Index -> Java GUI Toolkits View previous topic :: View next topic   Author Message vijju Guest Posted: Thu May 04, 2006 5:07 am    Post subject: TextField to accept only Integer values. Hi, In My application,I am having a textField ,which has to take Long Value from the Runtime class. But TextField.setText() takes only string.If i convert the Long to String,The Long equivalent of the String will be Returned,This does not FullFill my Purpose. How can i take Integer values in the textField. Regards, Vijay Back to top Bart Cremers Guest Posted: Thu May 04, 2006 7:07 am    Post subject: Re: TextField to accept only Integer values. Use a JFormattedTextField instead: JFormattedTextField field = new JFormattedTextField(NumberFormat.getIntegerInstance()); field.setValue(new Integer(123)); Integer intValue = (Integer) field.getValue(); Bart Back to top Denis Guest Posted: Thu May 04, 2006 7:07 am    Post subject: Re: TextField to accept only Integer values. vijju: Quote: In My application,I am having a textField ,which has to take Long Value from the Runtime class. But TextField.setText() takes only string.If i convert the Long to String,The Long equivalent of the String will be Returned,This does not FullFill my Purpose. How can i take Integer values in the textField. When the dialog (or the frame) is being closed insert: try { num = Integer.valueOf(textField.getText()); } catch (NumberFormatException nfe) { //Here the code to execute if the text was not a number. } Quote: Regards, Vijay DM Back to top Thomas Hawtin Guest Posted: Thu May 04, 2006 1:07 pm    Post subject: Re: TextField to accept only Integer values. vijju wrote: Quote: In My application,I am having a textField ,which has to take Long Value from the Runtime class. But TextField.setText() takes only string.If i convert the Long to String,The Long equivalent of the String will be Returned,This does not FullFill my Purpose. How can i take Integer values in the textField. Assuming you are using Swing (and at least Java 1.4), adding a DocumentFilter to the field's document is the way to go. There's an example within the linked example: http://www.jroller.com/resources/t/tackline/PayCalculator.java You can see that example in action, with Java WebStart: http://www.jroller.com/resources/t/tackline/PayCalculator.jnlp Tom Hawtin -- Unemployed English Java programmer http://jroller.com/page/tackline/ Back to top Developer Dude Guest Posted: Mon May 08, 2006 11:07 pm    Post subject: Re: TextField to accept only Integer values. I agree with Tom's suggestion; I wrote a general purpose DocumentFilter which applies regular expressions. I can also limited the length of what is entered and beep when the user tries to enter invalid input. Figuring out the right RegEx for a given situation and debugging it is sometimes hard (RegEx's found on the internet don't always work correctly in the filter so it sometimes takes a little playing around) - but once it works, it works well. Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> Java GUI Toolkits All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.