Ошибка компиляции при добавлении ActionListener в созданный массив GUI
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22-09-2019 - |
Вопрос
У меня был огромный файл для создания этого графического интерфейса, и я сократил его, используя массивы.Я пытаюсь добавить ActionListener, но когда добавляются массивы, и я получаю следующие ошибки:
/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
Что я делаю не так?Есть ли более простой способ самодиагностики (например, редактор со встроенным руководством по синтаксису)?
Вот мой Код
// 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) {
}
Решение
Вам нужно заставить свой класс GUI реализовать ActionListener, изменив
public class GUI extends JFrame
Для
public class GUI extends JFrame implements ActionListener
Другие советы
Вам нужно просто импортировать заголовочный файл.....
import java.awt.event.ActionListener;
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