有谁知道怎么在JComboBox中加图片吗？

Question

我想要的效果是：左图片，右文字，同在一个JComboBox项中。有谁知道怎么做吗？我先谢谢啦！

Answer 1

// BookEntry.java
// A simple aggregate class to store a book's title and icon.
//import javax.swing.ImageIcon;public class BookEntry {
    private final String title;
    private final String imagePath;
    private ImageIcon image;    public BookEntry(String title, String imagePath) {
        this.title = title;
        this.imagePath = imagePath;
    }    public String getTitle() { return title; }
    
    public ImageIcon getImage() {
        if (image == null) {
            image = new ImageIcon(imagePath);
        }
        return image;
    }    // Override standard toString method to give a useful result
    public String toString() { return title; }
}

Answer 2

//  ComboBoxEditorExample.java
// A custom combobox editor for use with the EditableComboBox class.
//
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;public class ComboBoxEditorExample implements ComboBoxEditor
{
    Map map;
    ImagePanel panel;
    ImageIcon questionIcon;
 
    public ComboBoxEditorExample(Map m, BookEntry defaultChoice) {
        map = m;
        panel = new ImagePanel(defaultChoice); 
        questionIcon = new ImageIcon("question.gif"); 
    }    public void setItem(Object anObject)
    {
        if (anObject != null) {
            panel.setText(anObject.toString());
            BookEntry entry = (BookEntry)map.get(anObject.toString());
            if (entry != null)
                panel.setIcon(entry.getImage());
            else
                panel.setIcon(questionIcon);
        } 
    }    public Component getEditorComponent() { return panel; }
    public Object getItem() { return panel.getText(); }
    public void selectAll() { panel.selectAll(); }    public void addActionListener(ActionListener l) {
        panel.addActionListener(l); 
    }    public void removeActionListener(ActionListener l) {
        panel.removeActionListener(l); 
    }    //  We create our own inner class to handle setting and
    //  repainting the image and the text.
    class ImagePanel extends JPanel {
       
        JLabel imageIconLabel;
        JTextField textField;        public ImagePanel(BookEntry initialEntry) {
            setLayout(new BorderLayout());            imageIconLabel = new JLabel(initialEntry.getImage());
            imageIconLabel.setBorder(new BevelBorder(BevelBorder.RAISED));            textField = new JTextField(initialEntry.getTitle());
            textField.setColumns(45);
            textField.setBorder(new BevelBorder(BevelBorder.LOWERED));            add(imageIconLabel, BorderLayout.WEST);
            add(textField, BorderLayout.EAST);
        }        public void setText(String s) { textField.setText(s); }
        public String getText() { return (textField.getText()); }        public void setIcon(Icon i) {
            imageIconLabel.setIcon(i);
            repaint();
        }        public void selectAll() { textField.selectAll(); }        public void addActionListener(ActionListener l) {
            textField.addActionListener(l); 
        }
        public void removeActionListener(ActionListener l) {
            textField.removeActionListener(l); 
        }
    }
}

Answer 3

//  EditableComboBox.java
// A fancy example of JComboBox with a custom renderer and editor used to
// display a list of JLabel objects that include both text and icons.
//
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;public class EditableComboBox extends JPanel {    private BookEntry books[] = {
           new BookEntry("Ant: The Definitive Guide", "covers/ant.gif"),
           new BookEntry("Database Programming with JDBC and Java",
                         "covers/jdbc.gif"),
           new BookEntry("Developing Java Beans", "covers/beans.gif"),
           new BookEntry("Developing JSP Custom Tag Libraries",
                         "covers/jsptl.gif"),
           new BookEntry("Java 2D Graphics", "covers/java2d.gif"),
           new BookEntry("Java and XML", "covers/jxml.gif"),
           new BookEntry("Java and XSLT", "covers/jxslt.gif"),
           new BookEntry("Java and SOAP", "covers/jsoap.gif"),
           new BookEntry("Java and XML Data Binding", "covers/jxmldb.gif"),
           new BookEntry("Java Cookbook", "covers/jcook.gif"),
           new BookEntry("Java Cryptography", "covers/jcrypto.gif"),
           new BookEntry("Java Distributed Computing", "covers/jdist.gif"),
           new BookEntry("Java I/O", "covers/javaio.gif"),
           new BookEntry("Java in a Nutshell", "covers/javanut.gif"),
           new BookEntry("Java Management Extensions", "covers/jmx.gif"),
           new BookEntry("Java Message Service", "covers/jms.gif"),
           new BookEntry("Java Network Programming", "covers/jnetp.gif"),
           new BookEntry("Java Performance Tuning", "covers/jperf.gif"),
           new BookEntry("Java RMI", "covers/jrmi.gif"),
           new BookEntry("Java Security", "covers/jsec.gif"),
           new BookEntry("JavaServer Pages", "covers/jsp.gif"),
           new BookEntry("Java Servlet Programming", "covers/servlet.gif"),
           new BookEntry("Java Swing", "covers/swing.gif"),
           new BookEntry("Java Threads", "covers/jthread.gif"),
           new BookEntry("Java Web Services", "covers/jws.gif"),
           new BookEntry("Learning Java", "covers/learnj.gif")
    };    Map bookMap = new HashMap();    public EditableComboBox() {
      // Build a mapping from book titles to their entries
      for (int i = 0 ; i < books.length; i++) {
        bookMap.put(books[i].getTitle(), books[i]);
      }      setLayout(new BorderLayout());       JComboBox bookCombo = new JComboBox(books);
      bookCombo.setEditable(true);
      bookCombo.setEditor(
        new ComboBoxEditorExample(bookMap, books[0]));
      bookCombo.setMaximumRowCount(4);
      bookCombo.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent e) {
              System.out.println("You chose " + ((JComboBox)e.getSource()).
                                                getSelectedItem()  + "!"); 
          }
      });
      bookCombo.setActionCommand("Hello");
      add(bookCombo, BorderLayout.CENTER);
    }    public static void main(String s[]) {
         JFrame frame = new JFrame("Combo Box Example");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setContentPane(new EditableComboBox());
         frame.pack();
         frame.setVisible(true);
    }
}

Answer 4

To:chenweionline(键盘上的舞者)
您可能误解了我的意思，我想让JComboBox里的每一项都有不同的图片和文字，即把图片和文字加入到JComboBox的每一项中，而不是固定图片。

Answer 5

JComboBox的每一项是不同啊，使用books[]填充的嘛，你仔细看看。

Answer 6

我也想知道，特别是加入到JList中，怎么做谢谢大家