java radio button and exception

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java radio button and exception

Dear Sir/Madam, I have problem with my addBagelRadioButton and addCheeseRadioButton. There should be only 1 radio button can be selected, but somehow 2 can be selected the same time. Also, I tried to only allow only letters can be enter in the inputTextField. But both letter and number can be enter. So,I request your kind help.

Thank you.

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