In java, I have a JFrame with nine buttons labeled 0-9, and I am trying to create a passcode screen where the user has to enter the correct passcode to exit the program or turn the JFrame red. I am having issues getting the button and storing the number in a variable, and creating a method to check if they got the passcode correct. The length of the passcode is only three numbers..

1. In java, I have a JFrame with nine buttons labeled 0-9, and I am trying to create a passcode
screen where the user has to enter the correct passcode to exit the program or turn the JFrame
red. I am having issues getting the button and storing the number in a variable, and creating a
method to check if they got the passcode correct. The length of the passcode is only three
numbers.