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What is JComboBox in Java?

What is JComboBox in Java?

JComboBox is a part of Java Swing package. JComboBox shows a popup menu that shows a list and the user can select a option from that specified list . JComboBox can be editable or read- only depending on the choice of the programmer . Constructor of the JComboBox are: JComboBox() : creates a new empty JComboBox .

What is ComboBox explain with example?

A combo box is a GUI feature that combines a drop-down box, list box, and/or an editable text field, giving the user multiple ways to input or select the desired information. The term “combo box” may also refer specifically to a drop-down list, which only allows choices to be selected (user cannot type a value).

How do you create a drop-down list in Java Swing?

Java JComboBox Example with ActionListener

  1. import javax.swing.*;
  2. import java.awt.event.*;
  3. public class ComboBoxExample {
  4. JFrame f;
  5. ComboBoxExample(){
  6. f=new JFrame(“ComboBox Example”);
  7. final JLabel label = new JLabel();
  8. label.setHorizontalAlignment(JLabel.CENTER);

Which is the superclass for JComboBox?

Other methods you are most likely to invoke on a JComboBox object are those it inherits from its superclasses, such as setPreferredSize . See The JComponent API for tables of commonly used inherited methods.

How do you code a combobox in Java?

A combo box is a combination of a text field and a drop-down list from which the user can choose a value. If the text-field portion of the control is editable, the user can enter a value in the field or edit a value retrieved from the drop-down list. You use the JComboBox class to create combo boxes.

What is difference between ComboBox and Dropdownlist?

A drop-down list is a list in which the selected item is always visible, and the others are visible on demand by clicking a drop-down button. A combo box is a combination of a standard list box or a drop-down list and an editable text box, thus allowing users to enter a value that isn’t in the list.

What is the difference between ListBox and ComboBox?

The List box displays all the items at once in a text area, whereas the combo box displays only one item at a time. The rest of the items will be in a dropdown list for a combo box which can be viewed after clicking on it. The Listbox represents a Windows control that displays a list of items to a user.

What is JOptionPane in Java?

The JOptionPane class is used to provide standard dialog boxes such as message dialog box, confirm dialog box and input dialog box. These dialog boxes are used to display information or get input from the user. The JOptionPane class inherits JComponent class.

What is difference between listbox and ComboBox?

Do you need a custom renderer for a combo box?

To put anything else into a combo box or to customize how the items in a combo box look, you need to write a custom renderer. An editable combo box would also need a custom editor. Refer to Providing a Custom Renderer for information and an example. The preceding code registers an action listener on the combo box.

What do you need to know about jcombobox in Java?

Sets the data model that the JComboBox uses to obtain the list of items. Sets the visibility of the popup. Sets the prototype display value used to calculate the size of the display for the UI portion. Sets the renderer that paints the list items and the item selected from the list in the JComboBox field. Selects the item at index anIndex.

What does the propertychangelistener do in jcombobox?

Creates and returns a PropertyChangeListener that is responsible for listening for changes from the specified Action and updating the appropriate properties. Returns an instance of the default key-selection manager. Notifies all listeners that have registered interest for notification on this event type.

How to create an editable combo box in Java?

An editable combo box fires an action event when the user chooses an item from the menu and when the user types Enter. Note that the menu remains unchanged when the user enters a value into the combo box. If you want, you can easily write an action listener that adds a new item to the combo box’s menu each time the user types in a unique value.