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How to set mask of a maskformatter of a text field to accpet all the character

 
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Hi,
I am using a mask formatter for my jformatted text field.
Now the mask string that I am using for this mask formatter is taken from user Input.
Now if user enters nothing in the input i shud allow the jformattext field with the give mask formatter to accept all the character.
But since no mask is set in this case.(user input is either null or "" string)....
i can not set a single character to my jformattextfield allows not a single character
Help needed.
 
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