Run the test case below, hold CTRL and try clicking multiple items.

Test case:
import javax.swing.*;
import java.awt.*;

public class testlist
{
  public static void main(String[] args)
  {
    JFrame f = new JFrame();

    DefaultListModel v = new DefaultListModel();
    v.addElement("alsdkfj");
    v.addElement("lasdkfj");
    v.addElement("owieur");
    v.addElement("weoiru");
    v.addElement("lskdfj");
    v.addElement("zcxvn");
    v.addElement("zxcvlkzvm");



    JList a = new JList(v);
    a.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
    a.setVisibleRowCount(2);
    JScrollPane p = new JScrollPane(a);

    a.setLayoutOrientation(JList.HORIZONTAL_WRAP);


    f.getContentPane().add(p);
    f.pack();
    f.show();

  }
}

-- 
           Summary: Swing JList can't do multiple selection
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: SWING
        AssignedTo: graydon at redhat dot com
        ReportedBy: kho at redhat dot com
                CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
                    dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21444

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