How to Call a Method when Dropdown Item selected in Swing

on November 26, 2017

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Swing – Call a Method when Dropdown Item Selected

In this example, We will show you simple Java program about, How to call a method when dropdown item selected in Swing. This example program has been tested and shared with output.

Sample Program

package com.dineshkrish;
import java.awt.BorderLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
/**
* 
* @author Dinesh Krishnan
*
*/
public class DropdownExample extends JFrame {
private JComboBox<String> comboBox;
private JLabel label;
public DropdownExample(String title) {
// setting JFrame properties
super.setTitle(title);
super.setDefaultCloseOperation(EXIT_ON_CLOSE);
super.setSize(500, 250);
super.setVisible(true);
super.setLayout(new BorderLayout());
init();
}
private void init() {
comboBox = new JComboBox<String>();
// setting the items to combo-box
comboBox.addItem("One");
comboBox.addItem("Two");
comboBox.addItem("Three");
comboBox.addItem("Four");
comboBox.addItem("Five");
comboBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent event) {
// calling a method when Item changed in the drop-down
doSomething((String) event.getItem());
}
});
label = new JLabel();
this.add(comboBox, BorderLayout.NORTH);
this.add(label, BorderLayout.SOUTH);
}
private void doSomething(String selectedValue) {
// changing the label value
label.setText("You have selected : " + selectedValue);
}
public static void main(String[] args) {
new DropdownExample("Dropdown Example - Calling method when item selected...");
}
}