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Creating a PopupList

PopupList offers two constructors: public PopupList(Shell shell); public PopupList(Shell shell, int style); import org.eclipse.swt.SWT; import org.eclipse.swt.custom.PopupList; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.RowLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class PopupListUsing {   public static void main(String[] args) {     Display display = new Display();     final Shell shell = new Shell(display);     shell.setText("PopupList Test");     shell.setLayout(new RowLayout());     // Create a button to launch the list     Button button = new Button(shell, SWT.PUSH);     button.setText("Push Me");     button.addSelectionListener(new SelectionAdapter() {       public void widgetSelected(SelectionEvent event) {         PopupList list = new PopupList(shell);         list.setItems(new String[]{"A","B","C"});         String selected = list.open(shell.getBounds());         System.out.println(selected);       }     });     shell.pack();     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }