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

Question

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

这是视图：

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，由于控制器，模型和视图相互连接：

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);
}

}

我使用一个 Main 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：

未显示 JFRAME

• 错误在哪里？

Answer 1

您只需要更改实例化控制器类新实例的名称。

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();
}
});
}
}

项目的图像