[Solved] Why can’t this method be called inside actionListener?

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If you want to call method from listener implementation, put it out side implementation. For example,

JButton btnCompute = new JButton("Compute");
public void handleAction() {
    btnCompute.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            try {

                int n1 = 5;
                int n2 = 4;
                int minValue = minFunction(n1, n2);

            }

            catch (NumberFormatException ex) {

            }
        }
    });
}
public int minFunction(int n1, int n2) {
    int min;
    if (n1 > n2)
        min = n2;
    else min = n1;

    return min;
}

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solved Why can’t this method be called inside actionListener?