Java Swing How to - Find selected item of a JList and display it in real time

Question

We would like to know how to find selected item of a JList and display it in real time.

Answer

import java.awt.Dimension;
import java.awt.FlowLayout;
/*w  w w  . ja  v  a2s .co m*/
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class Main {

  public static void main(String args[]) {
    JFrame f = new JFrame();
    f.setSize(new Dimension(300, 300));
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setLayout(new FlowLayout());
    JLabel label = new JLabel("Update");
    String[] data = { "one", "two", "three", "four" };
    JList<String> dataList = new JList<>(data);

    dataList.addListSelectionListener(new ListSelectionListener() {

      @Override
      public void valueChanged(ListSelectionEvent arg0) {
        if (!arg0.getValueIsAdjusting()) {
          label.setText(dataList.getSelectedValue().toString());
        }
      }
    });
    f.add(new JScrollPane(dataList));
    f.add(label);

    f.setVisible(true);
  }

}