Restrict Input Field For Fix Length

I want to restrict the input field to 10 chars.
Both JTextField + PlaintDocument or JFormattedTexTField + MaskFormatter can do that.
So, I want to know which one is much better.
Thank you!

I, personally, prefer the approach via PlainDocument. The thing about JFormattedTextField is that it's giving a pretty bad user feedback as it allows entering the text and then rejects it when losing focus. With subclassing PlainDocument you ensure the user won't enter more than 10 characters in the first place.

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