A simple view corresponding to an example that shows how to use JFormattedTextField.

griffon+formattedTextField+view

package testformatted
import java.text.NumberFormat
import javax.swing.JFormattedTextField

application(title: 'testformatted',
  preferredSize: [320, 240],
  pack: true,
  //location: [50,50],
  locationByPlatform: true,
  iconImage:   imageIcon('/griffon-icon-48x48.png').image,
  iconImages: [imageIcon('/griffon-icon-48x48.png').image,
               imageIcon('/griffon-icon-32x32.png').image,
               imageIcon('/griffon-icon-16x16.png').image]) {
    // add content here    
    vbox{
      label(text:bind{model.mylabel})  
      textField(text:bind(target: model, targetProperty: 'mylabel'))
      separator()
      label(text:bind{model.mynumber})  
      widget(new JFormattedTextField(NumberFormat.getNumberInstance()),id:"myformatted",value:bind(target: model, targetProperty: 'mynumber'))
    }
}