Implement a graphical list selection monitor
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 SelectionMonitor extends JPanel {
String label[] = { "1", "2", "3"};
JCheckBox checks[] = new JCheckBox[label.length];
JList list = new JList(label);
public SelectionMonitor() {
JScrollPane pane = new JScrollPane(list);
add(pane);
list.addListSelectionListener(new RadioUpdater());
for (int i = 0; i < label.length; i++) {
checks[i] = new JCheckBox("Selection " + i);
add(checks[i]);
}
}
public static void main(String s[]) {
JFrame frame = new JFrame("Selection Monitor");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(new SelectionMonitor());
frame.pack();
frame.setVisible(true);
}
}
class RadioUpdater implements ListSelectionListener {
public void valueChanged(ListSelectionEvent e) {
if ((!e.getValueIsAdjusting()) || (e.getFirstIndex() == -1))
return;
for (int i = e.getFirstIndex(); i <= e.getLastIndex(); i++) {
System.out.println(((JList) e.getSource()).isSelectedIndex(i));
}
}
}
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