JavaFx事件处理

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class App15_1 extends Application {

    Button bt = new Button("设置字体颜色");
    TextArea ta = new TextArea("字体颜色");

    @Override
    public void start(Stage primaryStage) {

        BorderPane bPane = new BorderPane();
        bPane.setCenter(ta);
        bPane.setBottom(bt);
        BorderPane.setAlignment(bt, Pos.CENTER);

        bt.setOnAction(event -> ta.setStyle("-fx-text-fill: red"));


        Scene scene = new Scene(bPane, 180, 100);
        primaryStage.setScene(scene);
        primaryStage.setTitle("操作事件");
        primaryStage.show();

    }

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