Using Java and the swing framework, provide example code for handling a text field with a single character input. Provide filters for the character inputs to restrict values to 1-9 and " ".

For new Java programmers, the JOptionPane class is a great visual and user-friendly introduction to user input and Swing-based programming. Here's how to get started.

Want to know more about standard Java I/O concepts like standard input, standard output, and standard error? Read on!