[Ex094]

I can't get a great look at the code since I'm on mobile, but you should methodize the program (i.e., use methods to split it into chunks) and let it take command line arguments (the String[] args in main) to scrape the user's desired site. Also, with sites using couldflare, you need to give it a few seconds to pass the DDoS protection page.

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I need to know, can I use Selenium on any PC after creating a java application? Or I need to install Selenium on each PC I intend to use the application on?

After compiling ("creating", in your terms) the program, it will work on any computer you use it on. That's why Java requires import statements for everything: import statements tell the compiler what to include in the final product. Additionally, since Java is completely cross-platform, you can run it on any computer that has Java installed, not just PC.

Does Selenium support javascript input on submit buttons? Because I tried using HTMLUnit and it didn't submit my requests on clicking buttons with it, I read I found that if the website had javascript errors then it would'nt load and work properly. So Does Selenium have this same problem?

Are you trying to Click a Submit button via JS?