Swing Checkbox ItemListener Java Example

on November 27, 2017

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Swing – Checkbox ItemListener Java

In this example, We will show you a Checkbox ItemListener Java program. This example program has been tested and shared in the same post.

Sample Program

package com.dineshkrish;
import java.awt.BorderLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
/**
* 
* @author Dinesh Krishnan
*
*/
public class CheckboxExample extends JFrame {
private JPanel panel;
private JCheckBox school;
private JCheckBox ug;
private JCheckBox pg;
private JCheckBox phd;
private JLabel label;
public CheckboxExample(String title) {
// setting properties for windows
super.setTitle(title);
super.setDefaultCloseOperation(EXIT_ON_CLOSE);
super.setSize(300, 100);
super.setVisible(true);
super.setLayout(new BorderLayout());
init();
}
private void init() {
// creating panel
panel = new JPanel();
// creating all checkbox
school = new JCheckBox("School");
ug = new JCheckBox("UG");
pg = new JCheckBox("PG");
phd = new JCheckBox("Phd");
school.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
populateSelectedValue();
}
});
ug.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
populateSelectedValue();
}
});
pg.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
populateSelectedValue();
}
});
phd.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
populateSelectedValue();
}
});
// adding all checkbox to panel
panel.add(school);
panel.add(ug);
panel.add(pg);
panel.add(phd);
label = new JLabel();
// adding panel to JFrame
add(panel, BorderLayout.NORTH);
add(label, BorderLayout.SOUTH);
}
private void populateSelectedValue() {
List<String> selectedValue = new ArrayList<String>();
if (school.isSelected()) {
selectedValue.add(school.getActionCommand());
} else {
selectedValue.remove(school.getActionCommand());
}
if (ug.isSelected()) {
selectedValue.add(ug.getActionCommand());
} else {
selectedValue.remove(ug.getActionCommand());
}
if (pg.isSelected()) {
selectedValue.add(pg.getActionCommand());
} else {
selectedValue.remove(pg.getActionCommand());
}
if (phd.isSelected()) {
selectedValue.add(phd.getActionCommand());
} else {
selectedValue.remove(phd.getActionCommand());
}
label.setText("Your have completed : " + selectedValue);
}
public static void main(String[] args) {
new CheckboxExample("Checkbox Example");
}
}