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 " ".

In prior Java 101 articles, I referred to the concepts of redirection, standard input device, and standard output device. To demonstrate inputting data, several examples called System.in.read().

Interestingly, there is no method for Scanner char input, although there are strategies that can be employed to make that work. But if your program needs to take command-line input from the user in ...