Active 3 years, 8 months ago. Setting focus on JOptionPane text field. How to make a neat form And this tiny ad: JFrame visible - all else invisible. 
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This question has been asked before and already has an answer. I want to expand to some type of default open field for the user to enter a value betweenbut I don't really know how jnumberfifld format this field to make it look readable.
Carroll Carroll 5 7 7 bronze badges.
Java Source Code: rField
For field constructor's attribute have the class of Number what will be used eg. Swing - a field for integers alternative to JTextField? If I try to expand the size of jnumbefrield field with a string of white space see commented line in the codeit throws errors when the user enters a value.
InputVerifier and In the verify method you can check if a number is added, and you can optionally remove the number from the JTextField value, or disallowing the textfield from hnumberfield focus. And this tiny ad:. Originally posted by David Kaplowitz: If I try to expand the size of the field with a string of white space see commented line in the code.
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What is a NullPointerException, and how do I fix it? This jnumberfidld already has an answer here: Timer Error [duplicate] Ask Question. Malcolm I always knew the future would be like a science fiction novel, but why did it have to be one of Philip K. Originally posted by Campbell Ritchie: Hello, I have the following code: Jan 26 '16 at JFrame visible - all else invisible.
Stack Overflow works best with JavaScript enabled. And this tiny ad: The TimerTask classes I create are right inside the TimeClass my main class so they should be able to jnumberfiel the same variables?
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Also, I jnumberfiwld it's better design to declare the JTextField at class level so not inside the methodand jnumberrfield the the field in some init method: If I try to expand the size of the field with a string of white space see commented line in the codeTry a different constructor JTextField int columns Constructs a new empty TextField with the specified number of columns.
Is your code not working correctly, or do you want the user not to allow to enter anything but numbers? That leads to a NullPointerException here: How do we handle problem users?
For the latter to work, you can set an inputVerifier jnumberfiled the text field.
See javadoc for more information: Unicorn Meta Zoo 9: Well I did forget to create him. That leads to a NullPointerException here:. Setting focus on JOptionPane text field. Thanks for any pointers on what I should be using jnumberfielv instead of JTextField or how I'm misusing it.
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