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About Byron Kiourtzoglou

Byron Kiourtzoglou
Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

ListSelection example

With this tutorial we shall show you how to perform List Selection activities using JList components and ListSelectionListener interface. List selection is a very useful feature, when you applications requires user input with fixed choices.

In order to use JList and ListSelectionListener, one should perform the following steps:

  • Create a class that implements ListSelectionListener interface.
  • Override the methods that correspond to the events you want to monitor about the list e.g valueChanged and customize it to customize the handling of the respective event.
  • Create a new JList
  • Use the addListSelectionListener mehtod of the JList class to add to it the ListSelectionListener you’ve created.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.desktop;

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class ListSelectionExample extends JPanel {

    String labelArray[] = {"1", "2", "3"};
    JCheckBox checkBoxArray[] = new JCheckBox[labelArray.length];

    JList listLable = new JList(labelArray);

    public ListSelectionExample() {

  JScrollPane scrollPane = new JScrollPane(listLable);

  add(scrollPane);

  listLable.addListSelectionListener(new SelectionListen());

  for (int i = 0; i < labelArray.length; i++) {

checkBoxArray[i] = new JCheckBox("Option " + i);

add(checkBoxArray[i]);

  }
    }

    public static void main(String args[]) {

  JFrame jFrame = new JFrame("Selection example");

  jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  jFrame.setContentPane(new ListSelectionExample());

  jFrame.pack();

  jFrame.setVisible(true);

    }
}
class SelectionListen implements ListSelectionListener {

    @Override
    public void valueChanged(ListSelectionEvent evetn) {

  if ((!evetn.getValueIsAdjusting()) || (evetn.getFirstIndex() == -1)) {

return;

  }

  for (int i = evetn.getFirstIndex(); i <= evetn.getLastIndex(); i++) {

System.out.println(((JList) evetn.getSource()).isSelectedIndex(i));

  }
    }
}

 
This was an example on how how to perform List Selection activities using JList components and ListSelectionListener interface.

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