In the windows operating system, there is a notepad (notepad. exe) program for text editing. Please write a program to realize the basic functions of the software. (1) The main class name is simplenotepad. (2) Only the function of saving and opening files is needed. Save to TXT format and be able to name the file. Open the file in the format of TXT.

Filename	Size	Update
SimpleNotepad	0	2020-04-06
SimpleNotepad\cls	0	2020-04-06
SimpleNotepad\cls\OpenListener.class	1804	2020-04-09
SimpleNotepad\cls\SaveListener.class	2025	2020-04-09
SimpleNotepad\cls\SimpleNotepad.class	2287	2020-04-09
SimpleNotepad\SimpleNotepad.drjava	944	2020-04-06
SimpleNotepad\src	0	2020-04-09
SimpleNotepad\src\nullnull.txt	10	2020-04-09
SimpleNotepad\src\OpenListener.java	823	2020-04-08
SimpleNotepad\src\OpenListener.java~	779	2020-04-06
SimpleNotepad\src\SaveListener.java	1158	2020-04-08
SimpleNotepad\src\SaveListener.java~	1166	2020-04-08
SimpleNotepad\src\SimpleNotepad.java	1347	2020-04-08
SimpleNotepad\src\SimpleNotepad.java~	1328	2020-04-07

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