Exercise $3$: The StringVault Class $-$ Working with strings in Java

Note: Copy and paste the terminal output of your programs in your lab report as evidence of testing

your methods with different inputs.

$($Driver: Student B$)$

$(1/2$ point$)$ Implement and test a new Java class called StringVault.

Each instance of StringVault should have a private field secret for a string value that should

be accessible only to methods that can provide the password $($another string$),$ stored in

another private field password of the StringVault class. The password and secret should be

set by the constructor at the time the StringVault instance is created.

Provide public methods getSecret and setSecret for $($respectively$)$ accessing or replacing

the value of the secret field.

Each of these methods $($getSecret and setSecret$)$ should have an additional parameter for

the password. If the password doesn't match, getSecret should

return null and setSecret should have no side effect.

$($Driver: Student A$)$

$(1/2$ point$)$ Create a user program to test the StringVault class using the following steps:

Call setSecret with an incorrect password.

Confirm that the secret is not updated.

Call setSecret again with a correct password.

Confirm that the secret is updated this time.