Create a JComboBox Component in Java
In this section, you will learn about the JComboBox Component
of swing in java. The
JComboBox is used to display drop-down list. It provides you options to select an item from the item list. You can never select more than one items
from a combo box. Combo Box can be whether editable or only non-editable means
only readable.
This program displays a simple combo box on the frame
which contains multiple items like: BCA, MCA, PPC etc. The background color of this combo box
is gray and foreground color is red. Here, the background color of the combo box
and the foreground color is set using the setBackground(Color) and
setForeground(Color) method of the JComboBox class. When you select the item
from the combo box then the selected item is displayed in the text box. Image of
the result for the given program is as follows in the pictorial form:
And
APIs
used in the program:
JComboBox:
This is the class which is used to create a combo box
in swing using it's constructor.
itemStateChanged():
This is the method which receives the ItemEvent generated by the addItemListener()
method of the JComboBox class. The event is generated when you select
item from the combo box.
Here is the code of program:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ComboBox{
JComboBox combo;
JTextField txt;
public static void main(String[] args) {
ComboBox b = new ComboBox();
}
public ComboBox(){
String course[] = {"BCA","MCA","PPC","CIC"};
JFrame frame = new JFrame("Creating a JComboBox Component");
JPanel panel = new JPanel();
combo = new JComboBox(course);
combo.setBackground(Color.gray);
combo.setForeground(Color.red);
txt = new JTextField(10);
panel.add(combo);
panel.add(txt);
frame.add(panel);
combo.addItemListener(new ItemListener(){
public void itemStateChanged(ItemEvent ie){
String str = (String)combo.getSelectedItem();
txt.setText(str);
}
});
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400,400);
frame.setVisible(true);
}
}
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Current Comments
4 comments so far (post your own) View All Comments Latest 10 Comments:this is good site for learning java
Posted by venu on Saturday, 07.19.08 @ 03:13am | #67992
my question :- if multiple combobox how we check validation on apply button
Posted by chandan jha on Thursday, 05.29.08 @ 13:29pm | #61338
code fro to select an image from combobox & drag& drop on frame in java
Posted by sayali on Wednesday, 04.18.07 @ 09:42am | #14476
i have some items in the textarea(multiline).if a user selects an item ,that is to be displayed in the textbox we provide.i need jsp code for this.plz help me in this regard.
Posted by anshu on Wednesday, 12.13.06 @ 13:10pm | #942