MultipleIntervalSelection

MultipleIntervalSelection.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

/**
This class demonstrates the List Component in
multiple interval selection mode.
*/

public class MultipleIntervalSelection extends JFrame
{
   private JPanel monthPanel; // To hold components
   private JPanel selectedMonthPanel; // To hold components
   private JPanel buttonPanel; // To hold the button

   private JList monthList; // To hold months
   private JList selectedMonthList; // Selected months

   private JScrollPane scrollPane1; // Scroll pane - first list
   private JScrollPane scrollPane2; // Scroll pane - second list

   private JButton button; // A button

   // The following array holds the values that
   // will be displayed in the monthList list component.
   private String[] months = { "January", "February",
            "March", "April", "May", "June", "July",
            "August", "September", "October", "November",
            "December" };

   /**
Constructor
*/

   public MultipleIntervalSelection()
   {
      // Set the title.
      setTitle("List Demo");

      // Specify an action for the close button.
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      // Add a BorderLayout manager.
      setLayout(new BorderLayout());

      // Build the panels.
      buildMonthPanel();
      buildSelectedMonthsPanel();
      buildButtonPanel();

      // Add the panels to the content pane.
      add(monthPanel, BorderLayout.NORTH);
      add(selectedMonthPanel,BorderLayout.CENTER);
      add(buttonPanel, BorderLayout.SOUTH);

      // Pack and display the window.
      pack();
      setVisible(true);
   }

   /**
The buildMonthPanel method adds a list containing the
names of the months to a panel.
*/

   private void buildMonthPanel()
   {
      // Create a panel to hold the list.
      monthPanel = new JPanel();

      // Create the list.
      monthList = new JList(months);

      // Set the selection mode to multiple
      // interval selection.
      monthList.setSelectionMode(
        ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

      // Set the number of visible rows to 6.
      monthList.setVisibleRowCount(6);

      // Add the list to a scroll pane.
      scrollPane1 = new JScrollPane(monthList);

      // Add the scroll pane to the panel.
      monthPanel.add(scrollPane1);
   }

   /**
The buildSelectedMonthsPanel method adds a list
to a panel. This will hold the selected months.
*/

   private void buildSelectedMonthsPanel()
   {
      // Create a panel to hold the list.
      selectedMonthPanel = new JPanel();

      // Create the list.
      selectedMonthList = new JList();

      // Set the number of visible rows to 6.
      selectedMonthList.setVisibleRowCount(6);

      // Add the list to a scroll pane.
      scrollPane2 =
              new JScrollPane(selectedMonthList);

      // Add the scroll pane to the panel.
      selectedMonthPanel.add(scrollPane2);
   }

   /**
The buildButtonPanel method adds a
button to a panel.
*/

   private void buildButtonPanel()
   {
      // Create a panel to hold the list.
      buttonPanel = new JPanel();

      // Create the button.
      button = new JButton("Get Selections");

      // Add an action listener to the button.
      button.addActionListener(new ButtonListener());

      // Add the button to the panel.
      buttonPanel.add(button);
   }

   /**
Private inner class that handles the event when
the user clicks the button.
*/

   private class ButtonListener implements ActionListener
   {
      public void actionPerformed(ActionEvent e)
      {
         // Get the selected values.
         Object[] selections =
                        monthList.getSelectedValues();

         // Store the selected items in selectedMonthList.
         selectedMonthList.setListData(selections);
      }
   }

   /**
The main method creates an instance of the
MultipleIntervalSelection class which causes it
to display its window.
*/

   public static void main(String[] args)
   {
      new MultipleIntervalSelection();
   }
}