MultipleSelectionTest.java

// Fig. 12.26: MultipleSelectionTest.java
// JList that allows multiple selections.
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JButton;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;

class MultipleSelectionFrame extends JFrame 
{
   private final JList<String> colorJList; // list to hold color names
   private final JList<String> copyJList; // list to hold copied names
   private JButton copyJButton; // button to copy selected names
   private static final String[] colorNames = {"Black", "Blue", "Cyan",
      "Dark Gray", "Gray", "Green", "Light Gray", "Magenta", "Orange", 
      "Pink", "Red", "White", "Yellow"};

   // MultipleSelectionFrame constructor
   public MultipleSelectionFrame()
   {
      super("Multiple Selection Lists");
      setLayout(new FlowLayout());

      colorJList = new JList<String>(colorNames); // list of color names
      colorJList.setVisibleRowCount(5); // show five rows
      colorJList.setSelectionMode(
         ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
      add(new JScrollPane(colorJList)); // add list with scrollpane

      copyJButton = new JButton("Copy >>>"); 
      copyJButton.addActionListener(
         new ActionListener() // anonymous inner class 
         {  
            // handle button event
            @Override
            public void actionPerformed(ActionEvent event)
            {
               // place selected values in copyJList
               copyJList.setListData(
                  colorJList.getSelectedValuesList().toArray(
                     new String[0]));
            }
         } 
      ); 

      add(copyJButton); // add copy button to JFrame

      copyJList = new JList<String>(); // list to hold copied color names
      copyJList.setVisibleRowCount(5); // show 5 rows
      copyJList.setFixedCellWidth(100); // set width
      copyJList.setFixedCellHeight(15); // set height
      copyJList.setSelectionMode(
         ListSelectionModel.SINGLE_INTERVAL_SELECTION);
      add(new JScrollPane(copyJList)); // add list with scrollpane
   } 
} // end class MultipleSelectionFrame

public class MultipleSelectionTest
{
   public static void main(String[] args)
   { 
      MultipleSelectionFrame multipleSelectionFrame =
         new MultipleSelectionFrame(); 
      multipleSelectionFrame.setDefaultCloseOperation(
         JFrame.EXIT_ON_CLOSE);
      multipleSelectionFrame.setSize(350, 150); 
      multipleSelectionFrame.setVisible(true); 
   } 
} // end class MultipleSelectionTest