The DSA course in this term provided some visualization programs for understanding data structures and algorithms. However, all of them are applet programs. Applet can run with proper JAVA environment simply in browsers in the past, but they are not supported by modern browsers any more. Meanwhile, current JAVA environment of a higher version doesn't support it either.
Method that Works Perfectly
There's a relatively simple way to run applet. I have tested it on macOS, and I guess it's similar on Linux or even Windows.
1) Install IntelliJ IDEA.
2) Open IDEA and click "New Project".
3) Download JRE of old version. (Newer versions don't support it.)
In the selection menu of JDK, you can download JDKs that are not installed on your computer. And you can choose to download an version that is old enough.
4) Run with commands!
Now the IDEA can be closed. (You don't need to really create a project.) Enter the directory where
*.applet exists, and run it with
appletviewer *.applet command.
❯ l total 120 drwxr-x---@ 11 colin staff 352B Jan 6 09:18 . drwxr-x---@ 11 colin staff 352B Jan 6 15:45 .. -rw-r-----@ 1 colin staff 39K Dec 2 2019 avl_seanet.jar drwxr-x---@ 19 colin staff 608B Feb 16 2019 images -rw-r-----@ 1 colin staff 144B Dec 2 2019 index.applet drwxr-x---@ 5 colin staff 160B Feb 16 2019 sounds drwxr-x---@ 19 colin staff 608B Jan 6 08:48 src ❯ appletviewer index.applet
Before I found the method above, I tried with a Chrome extension
python3 -m http.server 9090. After that, you can change the file
applet.html, and open the html in the browser.
The extension can run applets. However, it doesn't perform very well. When I opened theprovided by the teacher, or ran the applet hosted by my local http server, the main window of applets could be shown, but the functions didn't work. So the extension only has limited support for running applets.