Introduction - If you have any usage issues, please Google them yourself
Using Swing components to write a text editing program, the program starts, multi-line text input box TextArea to display the current directory myText.txt file any original content, if the file does not exist, create the file. "Save" button functions: multi-line text input box write the contents of the TextArea myText.txt file saved. "Cancel" button functions: multi-line text input box empty the contents of the TextArea. "Exit" button functions: exit the program