Combobox combines a button or editable field and a drop-down list. : ComboBox « Swing JFC « Java

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Java » Swing JFC » ComboBox 




Combobox combines a button or editable field and a drop-down list.
  

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JLabel;

public class ComboBox extends JDialog implements ActionListener, ItemListener {
  final String[] authors = "A""B""C""D""E""F" };
  final String[] images = "a.jpg""b.jpg""c.jpg""d.jpg","e.jpg""f.jpg" };

  JLabel display = new JLabel();
  JComboBox combobox = new JComboBox(authors);
  JButton button = new JButton("Close");

  ImageIcon icon = new ImageIcon(ClassLoader.getSystemResource("a.jpg"));

  public ComboBox() {
    setLayout(new FlowLayout());
    add(display);
    combobox.setSelectedIndex(-1);
    combobox.addItemListener(this);
    add(combobox);
    
    button.addActionListener(this);
    add(button);

    setSize(300300);
    setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
    setLocationRelativeTo(null);
    setVisible(true);
  }

  public static void main(String[] args) {
    new ComboBox();
  }

  public void actionPerformed(ActionEvent e) {
    System.exit(0);
  }

  public void itemStateChanged(ItemEvent e) {
    if (e.getStateChange() == ItemEvent.SELECTED) {
      JComboBox combo = (JComboBoxe.getSource();
      int index = combo.getSelectedIndex();
      display.setIcon(new ImageIcon(ClassLoader.getSystemResource(images[index])));
    }
  }
}

   
    
  














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20.Determining When the Menu of a JComboBox Component Is Displayed
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23.Setting the Number of Visible Items in the Menu of a JComboBox Component
24.Displaying the Menu in a JComboBox Component Using a Keystroke If the Selected Item Is Not Unique
25.Displaying the Menu in a JComboBox Component Using a Keystroke
26.Determining If the Menu of a JComboBox Component Is Visible
27.Selecting an Item in a JComboBox Component with Multiple Keystrokes
28.Adding and Removing an Item in a JComboBox Component
29.Add an item after the first item
30.Add an item to the end of the list
31.Remove first item
32.Remove the last item
33.Remove all items
34.Getting the Items in a JComboBox Component
35.Getting and Setting the Selected Item in a JComboBox Component
36.If the combobox is editable, the new value can be any value
37.Creating a read-only and editable JComboBox Component
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39.A frame with a sample text label and a combo box for selecting font faces
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