HOW TO REPLACE CHARACTER IN JTextField  WHEN THE USER TYPES

hOW TO OVERWRITE THE EXISTIG CHARACTER IN THE jtEXTfIELD INSTEAD OF INSERTING IN A jtEXTfIELD ?
ANY HELP IS APPRICIATED

Your keyboard is broken. I suggest you fix it if you want help in the future because using capital letters appears like "SHOUTING" and we don't like to shouted at.
Anyway you wouldn't use a DocumentListener, because the Document has already been updated by the time the Document event has fired.
You might be able to use a DocumentFilter, which is also discussed in the above tutorial.
Or, you can search the forum for my "Overtype TextArea" (without the spaces) example that may do what you want.

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