防止多个窗口并在失去焦点时关闭窗口JAVAFX

import javafx.application.Application;
import javafx.stage.Stage;

public class SingleWindowApp extends Application {
    private static Stage primaryStage;

    @Override
    public void start(Stage stage) {
        if (primaryStage != null) {
            stage.close();
            return;
        }
        primaryStage = stage;
        // 设置窗口属性
        stage.setTitle("Single Window App");
        stage.show();
    }

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

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;

public class SingleWindowApp extends Application {
    private static Stage primaryStage;

    @Override
    public void start(Stage stage) {
        if (primaryStage != null) {
            stage.close();
            return;
        }
        primaryStage = stage;
        // 设置窗口属性
        stage.setTitle("Single Window App");

        // 监听关闭事件
        stage.setOnCloseRequest(event -> {
            event.consume(); // 阻止默认关闭行为
            // 可以在这里添加自定义的关闭逻辑
        });

        stage.show();
    }

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