How to make buttons enabled after the data is entered in JTextField?

I got a JTextField. I want to test the entered data in JTextField is eight length. If the data is of length eight then i want to enable two buttons. How to make it enable? I am getting the length eight, but the buttons are not enable. What listeners I have to use.
Can anybody help me out.
Thanks for your help in advanced.

Create a class that extends KeyAdapter. Add a field that is an array of buttons. Override the keyTyped(KeyEvent e) method to use getSource() to access the text area, check the length of the text, and if > 8, go through the array and enable the buttons in the array. Then, when you create the text area, create an instance of your listener, passing it an array of the two buttons you want to enable, and then use addKeyListener(yourKeyListener) to add your key listener to the text area.
Doug

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