import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.Scene;
import javafx.scene.web.WebView;
import javafx.stage.Stage;

public class Nav extends Application {
  public static void main(String[] args) { launch(args); }
  @Override public void start(Stage primaryStage) {
    final WebView webView = new WebView();
    webView.getEngine().load("http://docs.oracle.com/javafx/");
    
    webView.getEngine().locationProperty().addListener(new ChangeListener<String>() {
      @Override public void changed(ObservableValue<? extends String> prop, String before, String after) {
        webView.getEngine().load("http://www.about.com");
      }
    });
    
    primaryStage.setScene(new Scene(webView));
    primaryStage.show();
  }
}