Who should go first? Static variable issue

Question

I'm creating a game for a university assignment and one of the criteria is that the program asks who goes first.

I'm having a little trouble with this as I have defined ComputerPlayer firstPlayer and ComputerPlayer secondPlayer initially as null, to then set the value based on a button press, but I keep getting an error as the players are already previously defined.

Can anyone help me in re-wording this so it works? Thanks.

   public static void main(String[] args){
        JPanel panel = new JPanel();
        JRadioButton button1 = new JRadioButton("Human");
        JRadioButton button2 = new JRadioButton("Computer");
        panel.add(new JLabel("Who Goes First?"));
        panel.add(button1);
        panel.add(button2);
        ComputerPlayer firstPlayer = null;
        ComputerPlayer secondPlayer = null;

        JOptionPane.showMessageDialog(null, panel);


        if(button1.isSelected()) {       
            ComputerPlayer firstPlayer = new HumanPlayer();
            ComputerPlayer secondPlayer = new AIPlayer();
        }

        if(button2.isSelected()) {       
            ComputerPlayer firstPlayer = new AIPlayer();
            ComputerPlayer secondPlayer = new HumanPlayer();
        }

        GameLogic logic = new GameLogic();

        logic.addPlayer(firstPlayer); 
        logic.addPlayer(secondPlayer); 

        logic.startGame();
    }

Answer 1

Delete "ComputerPlayer" in if blocks. You already create this object, so u don't need do it again.

if(button1.isSelected()) {       
    firstPlayer = new HumanPlayer();
    secondPlayer = new AIPlayer();
}

if(button2.isSelected()) {       
    firstPlayer = new AIPlayer();
    secondPlayer = new HumanPlayer();
}