Canadian and US postal code Java

[asqinanuramni]

hello, I am currently struggling so bad in understanding Java and how to implement the codes. I have to implement two subclasses for Canadian and US postal code in Java.
For Canadian Postal code, a valid postal postal code has the rule: positions at 0,2,5 are letters. Positions at 1,4,6 are digits. Position at 3 is white space.
(eg: V9A 7N2)
For a valid USA postal code, it starts with two letter, then white space and followed by 5 digits. (eg: WA 98001)
I only need to do implementation on the Canadian and US class.
I have included the parent class and main.java for reference.

These are what was given:

[rproffitt]

For this I just look it up:

1. Canadian https://howtodoinjava.com/java/regex/canada-postal-code-validation/
2. US: https://howtodoinjava.com/java/regex/us-postal-zip-code-validation/

[JamesCherrill]

You can use Regex , but depending on where you are in the learning curve it may be simpler to do it directly…

There’s a String method that converts a string to an array of chars
The Character class has methods that tell you if a given char is numeric, alpha, blank etc