Right now the handle_click function simply takes a value specific to each button and prints it. This is intended as a demonstration of how to pass in variables to Button commands. In the standard case ...
JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21; ...