試圖打開多個JavaFX GUI窗口出現錯誤？

Question

我遇到了JavaFX多線程問題，如果任何人都可以提供幫助。請參閱下面的代碼。謝謝！

import ... 

public class Session extends Application implements Runnable { 
    String srcIP; 

    public Session() { 
    } 

    @Override 
    public void run() { 
     launch(); 
     System.out.println("New thread running with IP: " + srcIP); 
    } 

    public static void main(String args[]) { 
     new Thread(new Session()).start(); 
     new Thread(new Session()).start(); 
    } 

    @Override 
    public void start(Stage primaryStage) { 
     primaryStage.setTitle("Hello World!"); 
     StackPane root = new StackPane(); 
     root.setStyle("-fx-background-color: BLACK;"); 
     primaryStage.setScene(new Scene(root, 400, 330)); 
     primaryStage.show(); 
    } 
} 

這裏是控制檯輸出。它會運行第一個線程就好了。但第二個線程陷入了以下錯誤。

Exception in thread "Thread-1" java.lang.IllegalStateException: Application launch must not be called more than once 
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:94) 
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:75) 
    at javafx.application.Application.launch(Application.java:209) 
    at guiFX.Session.run(Session.java:27) 
    at java.lang.Thread.run(Thread.java:744) 
New thread running with IP: null 

Answer 1

從JavaDoc：

public static void launch(java.lang.String... args)

啓動一個獨立的應用程序。這個方法通常從main方法（）中調用。 它不能被多次調用，否則將引發異常。