代码如下

package com.laolang.keditor;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import lombok.extern.slf4j.Slf4j;

/**
 * @author khlbat
 * @version 1.0
 * @date 2021/3/12
 */
@Slf4j
public class KEditor extends Application {

    public static void main(String[] args) {
        log.info("main : " + Thread.currentThread().getName());
        launch(args);
    }

    @Override
    public void init() throws Exception {
        log.info("init : " + Thread.currentThread().getName());
        // 默认什么都不做
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        log.info("start : " + Thread.currentThread().getName());
        Parent root = FXMLLoader.load(getClass().getClassLoader().getResource("main.fxml"));
        Scene scene = new Scene(root,800,600);

        primaryStage.setTitle("第一个窗口");
        primaryStage.setScene(scene);
        primaryStage.show();
    }



    @Override
    public void stop() throws Exception {
        log.info("stop : " + Thread.currentThread().getName());
        // 默认什么都不做
    }
}

日志如下

2021-03-22 15:16:27.478 [main] INFO  com.laolang.keditor.KEditor - main : main
2021-03-22 15:16:27.487 [JavaFX-Launcher] INFO  com.laolang.keditor.KEditor - init : JavaFX-Launcher
2021-03-22 15:16:27.512 [JavaFX Application Thread] INFO  com.laolang.keditor.KEditor - start : JavaFX Application Thread
2021-03-22 15:16:31.522 [JavaFX Application Thread] INFO  com.laolang.keditor.KEditor - stop : JavaFX Application Thread

其中 JavaFX Application即为UI线程