public class MyPreferencePage1 extends FieldEditorPreferencePage implements
    IWorkbenchPreferencePage {

  public MyPreferencePage1() {
    super(GRID);

  }

  public void createFieldEditors() {
    addField(new DirectoryFieldEditor("PATH", "&Directory preference:",
        getFieldEditorParent()));
    addField(new BooleanFieldEditor("BOOLEAN_VALUE",
        "&An example of a boolean preference", getFieldEditorParent()));

    addField(new RadioGroupFieldEditor("CHOICE",
        "An example of a multiple-choice preference", 1,
        new String[][] { { "&Choice 1", "choice1" },
            { "C&hoice 2", "choice2" } }, getFieldEditorParent()));
    addField(new StringFieldEditor("MySTRING1", "A &text preference:",
        getFieldEditorParent()));
    addField(new StringFieldEditor("MySTRING2", "A &text preference:",
        getFieldEditorParent()));
  }

  @Override
  public void init(IWorkbench workbench) {
    setPreferenceStore(Activator.getDefault().getPreferenceStore());
    setDescription("A demonstration of a preference page implementation");
  }
} 

package de.vogella.preferences.page;

import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;



public class Activator extends AbstractUIPlugin {
	
	// The shared instance
		private static Activator plugin;

	private static BundleContext context;

	static BundleContext getContext() {
		return context;
	}

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext bundleContext) throws Exception {
		Activator.context = bundleContext;
	}

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext bundleContext) throws Exception {
		Activator.context = null;
	}
	
	public static Activator getDefault() {
		return plugin;
	}

}

/*******************************************************************************
 * Copyright (c) 2010 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package de.vogella.preferences.page.handlers;

import javax.inject.Named;

import org.eclipse.core.commands.Command;
import org.eclipse.core.commands.ParameterizedCommand;
import org.eclipse.e4.core.commands.ECommandService;
import org.eclipse.e4.core.commands.EHandlerService;
import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.widgets.Shell;

public class PreferenceHandlerHandler {
	@Execute 
	public void execute(IEclipseContext context, ECommandService commandService, EHandlerService handlerService){ 
		
		ParameterizedCommand cmd = commandService.createCommand("org.eclipse.ui.window.preferences", null); 
		handlerService.executeHandler(cmd); 
		System.out.println(cmd.getCommand().isDefined()); 
		
		} 
}

		ParameterizedCommand cmd = commandService.createCommand("org.eclipse.ui.window.preferences", null); 
		handlerService.executeHandler(cmd);