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Create and dispose children of a composite

/*  * Composite example snippet: create and dispose children of a composite  *  * For a list of all SWT example snippets see  * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets  */ import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableItem; public class Snippet98 {   static int pageNum = 0;   static Composite pageComposite;   public static void main(String args[]) {     Display display = new Display();     final Shell shell = new Shell(display);     shell.setLayout(new GridLayout());     Button button = new Button(shell, SWT.PUSH);     button.setText("Push");     pageComposite = new Composite(shell, SWT.NONE);     pageComposite.setLayout(new GridLayout());     pageComposite.setLayoutData(new GridData());     button.addListener(SWT.Selection, new Listener() {       public void handleEvent(Event event) {         if ((pageComposite != null) && (!pageComposite.isDisposed())) {           pageComposite.dispose();         }         pageComposite = new Composite(shell, SWT.NONE);         pageComposite.setLayout(new GridLayout());         pageComposite.setLayoutData(new GridData());         if (pageNum++ % 2 == 0) {           Table table = new Table(pageComposite, SWT.BORDER);           table.setLayoutData(new GridData());           for (int i = 0; i < 5; i++) {             new TableItem(table, SWT.NONE).setText("table item "                 + i);           }         } else {           new Button(pageComposite, SWT.RADIO).setText("radio");         }         shell.layout(true);       }     });     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch())         display.sleep();     }     display.dispose();   } }