java swt browser

package cmsdb.common.tool;

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
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.Text;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormAttachment;
import com.swtdesigner.SWTResourceManager;

public class MyBroswer {
  public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setImage(SWTResourceManager.getImage(MyBroswer.class, "/cmsdb/gui/icon/CMS.gif"));
    shell.setText("资料浏览器");
    shell.setSize(907, 539);
    shell.setLayout(new FormLayout());

    ToolBar toolbar = new ToolBar(shell, SWT.NONE);
    toolbar.setLayoutData(new FormData());
  
    final Text text = new Text(shell, SWT.BORDER);
    {
    	FormData formData = new FormData();
    	formData.right = new FormAttachment(toolbar, 772, SWT.RIGHT);
    	formData.bottom = new FormAttachment(toolbar, 0, SWT.BOTTOM);
    	formData.left = new FormAttachment(toolbar, 6);
    	text.setLayoutData(formData);
    }

    final Browser browser = new Browser(shell, SWT.NONE);
    {
    	FormData formData = new FormData();
    	formData.top = new FormAttachment(toolbar, 6);
    	formData.left = new FormAttachment(toolbar, 10, SWT.LEFT);
    	formData.bottom = new FormAttachment(100, -10);
    	formData.right = new FormAttachment(100, -10);
    	browser.setLayoutData(formData);
    }

    Listener listener = new Listener() {
      public void handleEvent(Event event) {
        ToolItem item = (ToolItem) event.widget;
        String string = item.getText();
        if (string.equals("Back"))
          browser.back();
        else if (string.equals("Stop"))
          browser.stop();
        else if (string.equals("Go"))
          browser.setUrl(text.getText());
      }
    };
    
    ToolItem goButton = new ToolItem(toolbar, SWT.PUSH);
    goButton.setText("Go");

    ToolItem stopButton = new ToolItem(toolbar, SWT.PUSH);
    stopButton.setText("Stop");
    
        ToolItem backButton = new ToolItem(toolbar, SWT.PUSH);
        backButton.setText("Back");
        backButton.addListener(SWT.Selection, listener);

    goButton.addListener(SWT.Selection, listener);
    stopButton.addListener(SWT.Selection, listener);

    text.addListener(SWT.DefaultSelection, new Listener() {
      public void handleEvent(Event e) {
        browser.setUrl(text.getText());
      }
    });

    shell.open();
    browser.setUrl("http://oreilly.com");
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}