Validating jtextfield

For examples of code that are similar among all varieties of text fields such as dealing with layout, look at the example lists for related components such as formatted text fields and spinners.

For this purpose, we have used the key Event class.The Escape key is used to start a new search or to finish the current one.Here is a picture of the Click the Launch button ro run Text Field Demo using Java™ Web Start (download JDK 7 or later).When the user indicates that text entry is complete (usually by pressing Enter), the text field fires an action event.If you need to obtain more than one line of input from the user, use a text area.

For example, you can add a document listener or a document filter to be notified when the text changes, and in the filter case you can modify the text field accordingly.