需要帮助让JRadioButton将Value返回到JTextField

Question

My program is simulating voting in the Electoral College. Each state has a certain number of votes. I am having trouble with getting my buttons for each state to return the proper amount of votes to a total, and then printing that total to the screen in a JTextField each time a button for that party is clicked.

My question is should I be using an ItemStateChanged or ActionListener? After some research online, I currently am using an ActionListener, but I can't seem to figure out the final implementation or if this is the best way of going about finishing my program.

ActionListener RadioButtonActionListener = new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e) 
            {
                if(e.getSource() instanceof JRadioButton)
                {
                    if(Democrat.isSelected() == true)
                    {
                        String Count = StateValue.getText();
                        int countInteger = Integer.parseInt(Count);
                        int demoCount = demoCount + countInteger;
                        demoTotal.setText(demoCount);
                    }
                    else if (Democrat.isSelected() == false)
                    {

                    }
                }
            }

        };

Rest of my code:

public class ElectoralCollegeGUI extends JFrame 
{
private static final long serialVersionUID = 1L;
private static int demoVoteCount = 0;
private static int repVoteCount = 0;
private static int undVoteCount = 0;
private JRadioButton Democrat,Republican,Undecided;
private static String whatState;

public ElectoralCollegeGUI()
{
    super("Cast Your Votes");
    //JPanel mainGridPanel = new JPanel();
    setLayout(new GridLayout(22,5));
    JLabel demoVoteLabel = new JLabel("Democrat Votes");
    JTextField demoTotal = new JTextField();
    JLabel repVoteLabel = new JLabel("Republican Votes");
    JTextField repTotal = new JTextField();     
    JLabel undVoteLabel = new JLabel("Undecided Votes");
    JTextField undTotal = new JTextField();




    demoTotal.setEditable(false);
    repTotal.setEditable(false);
    undTotal.setEditable(false);

    add(demoTotal, BorderLayout.SOUTH);
    add(repTotal, BorderLayout.SOUTH);
    add(undTotal,BorderLayout.SOUTH);
    add(demoVoteLabel);
    add(repVoteLabel);
    add(undVoteLabel);

    String[] state = {"Alabama", "Alaska", "Arizona", "Arkansas", "California", "Colorado", "Connecticut","Delaware", 
              "Florida" , "Georgia" ,"Hawaii","Idaho", "Illinois", "Indiana","Iowa","Kansas","Kentucky","Louisiana","Maine 1st", 
              "Maine 2nd" ,"Maine Popular","Maryland", "Massachusetts","Michigan","Minnesota","Mississippi","Missouri", 
              "Montant",   "Nebraska 1st",   "Nebraska 2nd",   "Nebraska 3rd", "Nebraska Popular", "Nevada","New Hampshire",
              "New Jersey",   "New Mexico","New York",   "North Carolina", "North Dakota",   "Ohio",   "Oklahoma",
              "Oregon",   "Pennsylvania",   "Rhode Island",   "South Carolina",   "South Dakota",
              "Tennessee",   "Texas",  "Utah",  "Vermont",  "Virginia",  "Washington",
              "West Virginia",  "Wisconsin",  "Wyoming",  "Washington,D.C.",};  

    String[] voteValue = { "9","3","11","6","55","9","7","3","29","16","4","4","20","11","6",
                        "6","8","8","1","1","2","10","11","16","10","6","10","3","1","1","1",
                        "2","6","4","14","5","29","15","3","18","7","7","20","4","9","3","11",
                        "38","6","3","13","12","5","10","3","3"};



    for ( int i = 0; i < 56 ; i++)
    {
        add(new VoteChoice(state[i] , voteValue[i]));
    }

}
    private class VoteChoice extends JPanel
    {
        private static final long serialVersionUID = 1L;

        public VoteChoice(String state, String voteValue)
        {
            setLayout(new FlowLayout());

            JLabel StateName = new JLabel(state);
            JLabel StateValue = new JLabel(voteValue);

            ButtonGroup party;
            party = new ButtonGroup();

            Democrat = new JRadioButton("Democrat");
            Republican = new JRadioButton("Republican");
            Undecided = new JRadioButton("Undecided");

            //adds buttons to party button group
            party.add(Democrat);
            party.add(Republican);
            party.add(Undecided);



            add(StateName, BorderLayout.WEST);
            add(StateValue,BorderLayout.WEST);
            add(Democrat, BorderLayout.EAST);
            add(Republican, BorderLayout.EAST);
            add(Undecided, BorderLayout.EAST);

            RadioButtonActionListener actionListener = new RadioButtonActionListener();
            Democrat.addActionListener(actionListener);
            Republican.addActionListener(actionListener);
            Undecided.addActionListener(actionListener);

Answer 1

So, from what I can ascertain from you code snippet, you want to know when changes occur on VoteChoice and update a field in the ElectoralCollegeGUI .

Now you are creating multiple instances of VoteChoice ...

for ( int i = 0; i < 56 ; i++)
{
    add(new VoteChoice(state[i] , voteValue[i]));
}

But the JRadioButton 's are instance fields of the ElectoralCollegeGUI class, this is going to mean that the fields will only have context to the last instance of VoteChoice that you created.

Instead, the radio buttons should be instance fields of the VoteChoice class and the VoteChoice should monitoring their states.

When the VoteChoice detects a change, it should trigger an event back to the ElectoralCollegeGUI describing what has changed. While you could reuse one of the many listener types available in the API, you might create your own, and using enum s, you could easily determine what has changed...

public interface VoteChoiceListener {
    public enum Party {
        DEMOCRAT,
        REPUBLICAN,
        UNDECIDED;
    }

    public void voteCast(VoiceChoice choice, Party party);
}

You would then register an instance of VoteChoiceListener with each instance of VoteChoice so it can trigger the event when a vote changes

This basically a observer pattern