What is a JComboBox?
What is a JComboBox?
JComboBox is a part of Java Swing package. JComboBox inherits JComponent class . 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 .
What event does JComboBox generate?
A JButton object draws itself and processes mouse, keyboard, and focus events on its own. You only hear from the JButton when the user triggers it by clicking on it or pressing the space bar while the button has the input focus. When this happens, the JButton object creates an event object belonging to the class java.
Which of the following is the correct constructor for JComboBox?
Commonly used Constructors:
| Constructor | Description |
|---|---|
| JComboBox() | Creates a JComboBox with a default data model. |
| JComboBox(Object[] items) | Creates a JComboBox that contains the elements in the specified array. |
| JComboBox(Vector items) | Creates a JComboBox that contains the elements in the specified Vector. |
Which of the following methods returns the object that was selected in the JComboBox?
Method Summary
| Modifier and Type | Method and Description |
|---|---|
| int | getSelectedIndex() Returns the first item in the list that matches the given item. |
| Object | getSelectedItem() Returns the current selected item. |
| Object[] | getSelectedObjects() Returns an array containing the selected item. |
What type does the method getSelectedItem in the JComboBox class return?
2 Answers. getSelectedObjects() returns an Object[] , what you see is the toString() of this array of Object s.
Which method can a program use to set the selected choice in a JComboBox?
Which method can aprogram use to set the selected choice in a JComboBox? The selection can only be set through the GUI by the user.
How get data from comboBox in Netbeans?
Object selectedItem = comboBox. getSelectedItem(); if (selectedItem != null) { String selectedItemStr = selectedItem. toString(); Foo(selectedItemStr); // Some method that takes a string parameter. }
