code: @Override
      public void onModuleLoad() {
          Button button = new Button("Place Pizza Order");
          button.addClickHandler(new ClickHandler() {
              @Override
              public void onClick(ClickEvent event) {
                  placeOrder();
              }
          });
          RootPanel.get().add(button);
  
          button = new Button("Do Put");
          button.addClickHandler(new ClickHandler() {
              @Override
              public void onClick(ClickEvent event) {
                  doPut();
              }
          });
          RootPanel.get().add(button);
  
          button = new Button("Do A Search on Yahoo /w Jsonp");
          button.addClickHandler(new ClickHandler() {
              @Override
              public void onClick(ClickEvent event) {
                  doJsonp();
              }
          });
  
          RootPanel.get().add(button);
      }
docs: This is the entry point method.