Erreur de compilation lors de l'ajout d'ActionListener à l'interface graphique créée par Array

Question

J'ai eu un énorme fichier pour créer cette interface graphique et je l'ai raccourci en utilisant des tableaux. Je suis en train d'ajouter un ActionListener mais quand les tableaux sont ajoutés et je reçois les erreurs suivantes:

/tmp/jc_3531/GUI.java:60: addActionListener(java.awt.event.ActionListener) in javax.swing.AbstractButton cannot be applied to (GUI) 
      nButtons[c].addActionListener(this); 
        ^
/tmp/jc_3531/GUI.java:69: cannot find symbol 
symbol : method addActionListener(GUI) 
location: class javax.swing.JLabel 
      labels[c].addActionListener(this); 
        ^
/tmp/jc_3531/GUI.java:78: addActionListener(java.awt.event.ActionListener) in javax.swing.JTextField cannot be applied to (GUI) 
      fields[c].addActionListener(this); 
        ^
/tmp/jc_3531/GUI.java:90: addActionListener(java.awt.event.ActionListener) in javax.swing.AbstractButton cannot be applied to (GUI) 
      sButtons[c].addActionListener(this); 
        ^
4 errors 

Qu'est-ce que je fais mal? Existe-t-il un moyen plus facile de s'auto-diagnostiquer (comme un éditeur avec un guide de syntaxe intégré)?

Voici mon code

// GUI with navigation amd file manipulation buttons 
import javax.swing.*; // provides basic window features 
import java.awt.event.*; 
import java.awt.GridLayout; 
import java.awt.BorderLayout; 
import java.text.NumberFormat; 

public class GUI extends JFrame 
{ 
    private Inventory inv;  
    private int currentDisplay = 0; 

    private JPanel nButtonJPanel; 
    private String nNames[]={"Load","Add","Modify","Delete","Search","Save"}; 
    private JButton nButtons[]; 

    private JPanel labelJPanel; 
    private String labeled[]={"Item ID","Name","Rating","# in Stock","Price","Inventory Value", 
    "Restocking Fee (5%)","Inventory Value with Fee","Total Value with Fee (all DVD's)"}; 
    private JLabel labels[]; 

    private JPanel fieldJPanel; 
    private String fieldsBlank[]={"","","","","","","","",""}; 
    private JTextField fields[]; 

    private JPanel sButtonJPanel; 
    private String sNames[]={"First","Prev","","Next","Last"}; 
    private JButton sButtons[]; 

    // LabelFrame constructor adds JLabels to JFrame 
    public GUI() 
    { 
     super("Inventory Program v.5"); 
     setLayout(new BorderLayout()); // set frame layout 

     // initialize values 
     RatedDVD d1 = new RatedDVD(1, "One Flew Over The Cuckoo's Nest", 3, 9.99, "PG"); 
     RatedDVD d2 = new RatedDVD(2, "The Matrix", 1, 13.01, "PG13"); 
     RatedDVD d3 = new RatedDVD(3, "Se7en", 7, 11.11, "R"); 
     RatedDVD d4 = new RatedDVD(4, "Oceans Eleven", 11, 9.02, "PG13"); 
     RatedDVD d5 = new RatedDVD(5, "Hitch Hikers Guide to the Galaxy", 42, 10.00, "G");  
     RatedDVD d6 = new RatedDVD(6, "The Invisible Man", 0, 4999.59, "G"); 

     // create inv and enter values 
     inv = new Inventory(); 
     inv.add(d1); 
     inv.add(d2); 
     inv.add(d3); 
     inv.add(d4); 
     inv.add(d5); 
     inv.add(d6); 

     inv.sort(); 

     //make nButtons 
     nButtonJPanel.setLayout(new GridLayout(1, nNames.length, 5, 5)); 
     nButtons=new JButton[nNames.length]; 
     for(int c=0;c<nButtons.length;c++){ 
      nButtons[c]=new JButton(nNames[c]); 
      nButtons[c].addActionListener(this); 
      nButtonJPanel.add(nButtons[c]); } 
     add(nButtonJPanel, BorderLayout.NORTH); 

     //make labels 
     labelJPanel.setLayout(new GridLayout(labeled.length, 1)); 
     labels=new JLabel[labeled.length]; 
     for(int c=0;c<labels.length;c++){ 
      labels[c]=new JLabel(labeled[c]); 
      labels[c].addActionListener(this); 
      labelJPanel.add(labels[c]);} 
     add(labelJPanel, BorderLayout.WEST); 

     //make fields 
     fieldJPanel.setLayout(new GridLayout(fieldsBlank.length, 1)); 
     fields=new JTextField[fieldsBlank.length]; 
     for(int c=0;c<fields.length;c++){ 
      fields[c]=new JTextField(fieldsBlank[c],28); 
      fields[c].addActionListener(this); 
      fields[c].setEditable(false); 
      fieldJPanel.add(fields[c]); } 
      populate(currentDisplay); 
     add(fieldJPanel, BorderLayout.EAST); 

     //make sButtons 
     sButtonJPanel.setLayout(new GridLayout(1, sNames.length, 5, 5)); 
     sButtons=new JButton[sNames.length];  
     Icon dvd50 = new ImageIcon(getClass().getResource("dvd50.jpg")); 
     for(int c=0;c<sButtons.length;c++){ 
      sButtons[c]=new JButton(sNames[c]); 
      sButtons[c].addActionListener(this); 
      sButtonJPanel.add(sButtons[c]);} 
     sButtons[2].setIcon(dvd50);  
     add(sButtonJPanel, BorderLayout.SOUTH); 
    }// end method 

    public void populate(int currentDisplay) 
    { 
    NumberFormat nf = NumberFormat.getCurrencyInstance(); 
    fields[0].setText(String.valueOf(inv.get(currentDisplay).getItem())); 
    fields[1].setText(inv.get(currentDisplay).getName()); 
    fields[2].setText(inv.get(currentDisplay).getRating()); 
    fields[3].setText(String.valueOf(inv.get(currentDisplay).getUnits())); 
    fields[4].setText(String.valueOf(nf.format(inv.get(currentDisplay).getPrice()))); 
    fields[5].setText(String.valueOf(nf.format(inv.get(currentDisplay).value()))); 
    fields[6].setText(String.valueOf(nf.format(inv.get(currentDisplay).fee()))); 
    fields[7].setText(String.valueOf(nf.format(inv.get(currentDisplay).feeValue()))); 
    fields[8].setText(String.valueOf(nf.format(inv.value()))); 
    } 

    public void actionPerformed(ActionEvent e) { 


    } 

Answer 1

Vous devez rendre votre GUI classe implémente ActionListener en changeant

public class GUI extends JFrame 

à

public class GUI extends JFrame implements ActionListener 

Answer 2

Vous devez simplement importer le fichier d'en-tête. ....

import java.awt.event.ActionListener;