Differences

This shows you the differences between two versions of the page.

--- swing:combo_box [2015/05/18 07:00]
gthanos [Listener Interface]
+++ swing:combo_box [2018/04/13 09:22]
gthanos [Νon-editable combo box]
@@ Line 20: / Line 20: @@
 Παρακάτω δίνονται δύο παραδείγματα από το site της Oracle, ένα για //non-editable// combo box και ένα για //editable// combo box.
-==== Νon-editable combo box ====
+===== Νon-editable combo box =====
 <code java ComboBoxDemo.java>
-package components;
 import java.awt.*;
 import java.awt.event.*;
@@ Line 37: / Line 35: @@
  *   images/Pig.gif
  */
+@SuppressWarnings({"serial", "unchecked"})
 public class ComboBoxDemo extends JPanel
               implements ActionListener {
@@ Line 48: / Line 47: @@
     //Create the combo box, select the item at index 4.
     //Indices start at 0, so 4 specifies the pig.
-    JComboBox petList = new JComboBox(petStrings);
+    JComboBox<String> petList = new JComboBox<>(petStrings);
     petList.setSelectedIndex(4);
     petList.addActionListener(this);
@@ Line 72: / Line 71: @@
   /** Listens to the combo box. */
   public void actionPerformed(ActionEvent e) {
-    JComboBox cb = (JComboBox)e.getSource();
+    JComboBox<String> cb = (JComboBox<String>)e.getSource();
     String petName = (String)cb.getSelectedItem();
     updateLabel(petName);
@@ Line 78: / Line 77: @@
   protected void updateLabel(String name) {
-    ImageIcon icon = createImageIcon("images/" + name + ".gif");
+    ImageIcon icon = createImageIcon(name + ".gif");
     picture.setIcon(icon);
     picture.setToolTipText("A drawing of a " + name.toLowerCase());
@@ Line 133: / Line 132: @@
 Το παραπάνω πρόγραμμα προϋποθέτει τις παρακάτω εικόνες {{:swing:animals.zip|}}.
-==== Εditable combo box ====
+===== Εditable combo box =====
 <code java ComboBoxDemo2.java>
-package components;
 import java.awt.*;
@@ Line 267: / Line 264: @@
+| Προηγούμενο: [[:swing:lists | Λίστες - Η κλάση JList ]] | [[:toc | Περιεχόμενα ]] | Επόμενο: [[:swing:panels | Η κλάση JPanel ]] |

Αντικειμενοστραφής Προγραμματισμός

User Tools

Site Tools

Differences

Page Tools