JSP

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For UserID
We will create a variable userID with empty value first,
then we will call a function getUserID, the result will return the variable userID.
Then create a function called setUserID with a parameter "x", then the value of userID will return "x" as well.

For PIN
We will create a variable PIN with empty value first,
then we will call a function getPIN, the result will return the variable PIN.
Then create a function called setPIN with a parameter "x", then the value of PIN will return "x" as well.

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