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I've been reading about it for the past 45 minutes and I still have no Idea how they limit the characters:

For example, i found the next code:


class DocumentInputFilter extends DocumentFilter...

Okay, I updated my code to this:



JPanel userPanel = new JPanel();
userPanel.setLayout(new GridLayout(2,1));

JLabel posLbl = new JLabel("POS #:");
posLbl.setFont(font2);...

I have the next dialog to pop up and ask the user for some info:


String id = (String)JOptionPane.showInputDialog(
null,
"Post #",
"Información del cliente.",...