如何将值从一个类传递到另一类GUI

Question

I'm new in JAVA programming but how do I pass variable/value from one class A to seconnd class B where B is my GUI and A is logic to display the players? I need to print the players name in GUI to lblPlayer label.

Class A:

    package driverPkg;

    import game.Card;
    import game.CardsUI;
    import game.players.CardPlayer;


    public class GameConsole implements CardsUI {


        public void currentCard(CardPlayer[] player) {


            for (CardPlayer p : player) {
            // here somehow return p.getName() and pass to the GUI
            }
        }
....more code not really need it

Class B (GUI)

public class CardsGameGUI extends JFrame {

    private JPanel contentPane;


    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    CardsGameGUI frame = new CardsGameGUI();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public CardsGameGUI() {
        setFont(new Font("Arial", Font.PLAIN, 26));
        setResizable(false);
        setTitle("Card Game");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 828, 556);
        contentPane = new JPanel();
        contentPane.setBackground(new Color(102, 153, 153));
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);


           JLabel lblPlayer = new JLabel("");//here i need to bring the players name
        lblPlayer.setFont(new Font("Arial One", Font.PLAIN, 13));
        lblPlayer.setBounds(6, 11, 49, 16);
        panel.add(lblPlayer);

...more code below not need it now

Thank your for your help

Answer 1

I guess the Player class is your businness object. Add PropertyChangeSupport to this class, let CardsGameGUI implement PropertyChangeListener and add it as a listener to the player instance. Everytime you change something in the console the player will fire a property change event and you can listen and react in the gui. It's a simple observer pattern.

A simple example can be found here: http://examples.javacodegeeks.com/core-java/beans/bean-property-change-event-listener/