actionlistener ne répond pas dans la calculatrice java

Question

s'il vous plaît voir le code de l'interface calculatrice ci-dessous, de mon point de vue des débutants le "1" devrait afficher quand il est pressé, mais évidemment je fais quelque chose de mal. toute suggestiosn s'il vous plaît?

import java.awt.*; 
import javax.swing.*; 
import javax.swing.border.*; 
import java.awt.event.*; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 


/** 
*A Class that operates as the framework for a calculator. 
*No calculations are performed in this section 
*/ 
public class CalcFrame extends JPanel 
{ 
    private CalcEngine calc; 

    private JFrame frame; 
    private JTextField display; 
    private JLabel status; 

    /** 
    * Constructor for objects of class GridLayoutExample 
    */ 
    //public CalcFrame(CalcEngine engine) 
    //{ 

     //frame.setVisible(true); 
     // calc = engine; 
     // makeFrame(); 

    //} 
    public CalcFrame() { 
    makeFrame(); 
    calc = new CalcEngine(); 
} 
class ButtonListener implements ActionListener { 
    ButtonListener() { 
    } 

    public void actionPerformed(ActionEvent e) { 
    if (e.getActionCommand().equals("1")) { 
     System.out.println("1"); 
    } 
    } 
} 




    /** 
    * This allows you to quit the calculator. 
    */ 

    // Alows the class to quit. 
    private void quit() 
    { 
     System.exit(0); 


    } 

    // Calls the dialog frame with the information about the project. 
    private void showAbout() 
    { 
     JOptionPane.showMessageDialog(frame, 
        "Declan Hodge and Tony O'Keefe Group Project", 
        "About Calculator Group Project", 
        JOptionPane.INFORMATION_MESSAGE); 
    } 


     // ---- swing stuff to build the frame and all its components ---- 

    /** 
    * The following creates a layout of the calculator frame. 
    */ 
    private void makeFrame() 
    { 
     frame = new JFrame("Group Project Calculator"); 
     makeMenuBar(frame); 

     JPanel contentPane = (JPanel)frame.getContentPane(); 
     contentPane.setLayout(new BorderLayout(8, 8)); 
     contentPane.setBorder(new EmptyBorder(10, 10, 10, 10)); 





     /** 
    * Insert a text field 
    */ 
     display = new JTextField(8); 
     contentPane.add(display, BorderLayout.NORTH); 

     //Container contentPane = frame.getContentPane(); 
     contentPane.setLayout(new GridLayout(4, 5)); 
     JPanel buttonPanel = new JPanel(new GridLayout(4, 4)); 
     contentPane.add(new JButton("9")); 
     contentPane.add(new JButton("8")); 
     contentPane.add(new JButton("7")); 
     contentPane.add(new JButton("6")); 
     contentPane.add(new JButton("5")); 
     contentPane.add(new JButton("4")); 
     contentPane.add(new JButton("3")); 
     contentPane.add(new JButton("2")); 
     contentPane.add(new JButton("1")); 
     contentPane.add(new JButton("0")); 
     contentPane.add(new JButton("+")); 
     contentPane.add(new JButton("-")); 
     contentPane.add(new JButton("/")); 
     contentPane.add(new JButton("*")); 
     contentPane.add(new JButton("=")); 
     contentPane.add(new JButton("C")); 
     contentPane.add(new JButton("CE")); 
     contentPane.add(new JButton("%")); 
     contentPane.add(new JButton("#")); 
     //contentPane.add(buttonPanel, BorderLayout.CENTER); 

     frame.pack(); 
     frame.setVisible(true); 
    } 

    /** 
    * Create the main frame's menu bar. 
    * The frame that the menu bar should be added to. 
    */ 










    private void makeMenuBar(JFrame frame) 
    { 
     final int SHORTCUT_MASK = 
      Toolkit.getDefaultToolkit().getMenuShortcutKeyMask(); 


     JMenuBar menubar = new JMenuBar(); 
     frame.setJMenuBar(menubar); 

     JMenu menu; 
     JMenuItem item; 

     // create the File menu 
     menu = new JMenu("File"); 
     menubar.add(menu); 






     // create the Quit menu with a shortcut "Q" key. 
     item = new JMenuItem("Quit"); 
      item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, SHORTCUT_MASK)); 
      item.addActionListener(new ActionListener() { 
           public void actionPerformed(ActionEvent e) { quit(); } 
          }); 
     menu.add(item); 

     // Adds an about menu. 
     menu = new JMenu("About"); 
     menubar.add(menu); 

     // Displays 
     item = new JMenuItem("Calculator Project"); 
      item.addActionListener(new ActionListener() { 
           public void actionPerformed(ActionEvent e) { showAbout(); } 
          }); 
     menu.add(item); 

    } 

} 

Answer 1

C'est beaucoup de code!

Vous ne créez pas réellement un ButtonListener et encore moins d'en ajouter un à un bouton.

Answer 2

Vous devez enregistrer le programme d'écoute d'action avec le bouton.

//Step 1. 
JButton b1 = new JButton("1"); 

//Step2 register 
b1.addActionListener(new ButtonListener()); 

---

EDIT

Démarrer en déclarant les boutons comme dans l'étape 1 ci-dessus. Ensuite, dans le panneau de contenu, vous devez ajouter le bouton de la même manière que vous ajoutez les boutons en ce moment.

contentPane.add(b1); 

Maintenant le bouton devrait s'afficher.