//Somewhere inside of main
while (a == 0) {
    if (Panel.getButton() == 10) {
                //System.out.println("if it print it works else it doens't");
                stuff();
    }
}

// The class
//private field
int ButtonPress;

// button array with event listener
buttons[i].addActionListener(new ActionListener() {
    @Override // Just following if possible please explain why this is needed.
                public void actionPerformed(ActionEvent e) {
                for (int i = 0; i <= 11; i++) // Checking conditions one at a time
                    if (e.getSource() == buttons[i]) { // if true set button
                        setButton(i);
                    }

// Method
void setButton(int i) {
    this.ButtonPress = i;
}

int getButton() {
    return ButtonPress;
}