java - 尝试在 Java 中实现 MVC 模式，但没有显示 JFrame，即使我的应用程序是 "running"

Question

我正在尝试实现我的第一个 MVC 应用程序，它允许按下按钮并在其上增加标签。

这是 View :

public class View extends javax.swing.JFrame {

/**
 * Creates new form View
 */
public View() {
    initComponents();
    buttonAzzera.setEnabled(false);
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    labelNumber = new javax.swing.JLabel();
    buttonAzzera = new javax.swing.JButton();
    buttonIncrementa = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    getContentPane().setLayout(new java.awt.GridLayout(1, 0));

    labelNumber.setText("              0");
    getContentPane().add(labelNumber);

    buttonAzzera.setText("Azzera");
    getContentPane().add(buttonAzzera);

    buttonIncrementa.setText("Incrementa");
    getContentPane().add(buttonIncrementa);

    pack();
}// </editor-fold>                        

// Variables declaration - do not modify                     
private javax.swing.JButton buttonAzzera;
private javax.swing.JButton buttonIncrementa;
private javax.swing.JLabel labelNumber;
// End of variables declaration                   

public JButton getButtonIncrementa() {
    return buttonIncrementa;
}

public JButton getButtonAzzera() {
    return buttonAzzera;
}

public void setLabelNumber(String valore) {
    labelNumber.setText(valore);
}

}

这是简单的模型:

public class Model {

    private int number;
    private boolean azzerabile;

    public Model() {
        number = 0;
        azzerabile = false;
    }

    //<editor-fold defaultstate="collapsed" desc="Getters and Setters">
    public int getNumber() {
        return number;
    }

    public void setNumber(int number) {
        this.number = number;
    }

    public boolean isAzzerabile() {
        return azzerabile;
    }

    public void setAzzerabile(boolean azzerabile) {
        this.azzerabile = azzerabile;
    }
//</editor-fold>

    public void incrementa() {
        number++;
        if (number == 5) {
            azzerabile = true;
        }
    }

    public void azzera() {
        number = 0;
        azzerabile = false;
    }

}

现在，模型和 View 通过 Controller 互连:

public class Controller {

private View view;
private Model model;


public Controller(View view, Model model) {
    this.view = view;
    this.model = model;
}


public void assegnaGestori() {
    ActionListener gestoreIncremento;
    ActionListener gestoreAzzeramento;

    gestoreIncremento = new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            model.incrementa();
            view.setLabelNumber(Integer.toString(model.getNumber()));
            // System.out.println("Ciao");
            if (model.isAzzerabile()) {
                view.getButtonAzzera().setEnabled(true);
            }
        }
    };

    view.getButtonIncrementa().addActionListener(gestoreIncremento);

    gestoreAzzeramento = new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            model.azzera();
            view.setLabelNumber("0");
            view.getButtonAzzera().setEnabled(false);
        }
    };

    view.getButtonAzzera().addActionListener(gestoreAzzeramento);

}

}

我使用主类来运行应用程序:

public class Main {

public static void main(String args[]) {
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
           Model model = new Model();
           View view = new View();
           Controller controller = new Controller(view, model);
           controller.assegnaGestori();
        }
    });
}

}

不幸的是，当我单击“运行”时，没有显示 JFrame，如下图所示:

no jframe shown

• 错在哪里？

Answer 1

您只需更改实例化 Controller 类的新实例的名称。

例如:

import javax.swing.SwingUtilities;

public class Main {

    public static void main(String args[]) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                Model model = new Model();
                View view = new View();
                Controller control = new Controller(view, model);
                control.assegnaGestori();
            }
        });
    }
}

Image of your project