code:
---------------------------------------------------------------

package javafxapplication1;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;

/**
 *
 * @author Administrator
 */
public class JavaFXApplication1 extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("aaaa壹壹壹壹壹壹壹壹壹");
        primaryStage.setWidth(200);
        primaryStage.setHeight(100);
        VBox vBox = new VBox();

        Button btn = new Button("bbbbb贰贰贰贰贰贰贰贰贰贰贰贰");
        Text text = new Text("ccccc叁叁叁叁叁叁叁叁叁叁");
        //text.setFont(new Font("SimSun",12));
        TextField tf = new TextField("ddddd肆肆肆肆肆肆肆肆");
        vBox.getChildren().addAll(btn, text,tf);
        Scene scene = new Scene(vBox);
        primaryStage.setScene(scene);

        primaryStage.show();
    }

   
    public static void main(String[] args) {
        launch(args);
    }
    
}


-------------------------------------
result:
-------------------------------------

The title of Stage is OK, but the Text/Button/TextField can not display the chinese charactar correctly.

if invoking .setFont(new Font("SimSun",12)), the chinese charactars are OK.