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Read the tutorial : The while and do-while Statements (The Java™ Tutorials > Learning the Java Language > Language Basics)

Please attach a recording so that we can get to the root cause.

move the folder js inside WEB-INF and accordingly change the path of js in the jsp...better to give relative path with reference to the container

Please check in the logs as what error is coming.

I did not got your question. Can you please elaborate ?

It compiles fine in my machine
Can you please give the details ....like which tool/IDE are using to compile the class ?

Sometimes there arises a need when a class that needs to be accessed from within the same package then default modifier is used.
For example : a third party library/jar which has a class used by...

Let me know what error are you getting exactly !!

Please debug the problem with a debugger --- as to check where the logic is breaking.

Yes we need to import. Only when its imported then comes the part whether it can be accessible depending on the visibility(private, public, protected)

Can you please let us know which part is not working so we can focus on the same.

Person class --> When we write a constructor explicitly(in this case name,year) we are telling the users that if they want to create a Person object then name and year is mandatory.
Now another...

Put down the detail requirements.

The class BallMover should not be static. Make it non static. That would resolve the issue

Yes we must use equals method.
When a user inputs the abbreviation the String is constructed with the new operator and hence new String object is created. This "==" checks if both the references...