不再使用反射调用 Java 9~11 中引入的 API (#4114)

HMCLCore/src/test/java/org/jackhuang/hmcl/JavaFXLauncher.java

@@ -17,10 +17,6 @@
  */
 package org.jackhuang.hmcl;
 
-import java.lang.invoke.MethodHandle;
-import java.lang.invoke.MethodHandles;
-import java.lang.invoke.MethodType;
-
 public final class JavaFXLauncher {
 
     private JavaFXLauncher() {
@@ -31,21 +27,9 @@ public final class JavaFXLauncher {
     static {
         // init JavaFX Toolkit
         try {
-            // Java 9 or Latter
-            final MethodHandle startup =
-                    MethodHandles.publicLookup().findStatic(
-                            javafx.application.Platform.class, "startup", MethodType.methodType(void.class, Runnable.class));
-            startup.invokeExact((Runnable) () -> {
+            javafx.application.Platform.startup(() -> {
             });
             started = true;
-        } catch (NoSuchMethodException e) {
-            // Java 8
-            try {
-                Class.forName("javafx.embed.swing.JFXPanel").getDeclaredConstructor().newInstance();
-                started = true;
-            } catch (Throwable e0) {
-                e0.printStackTrace();
-            }
         } catch (IllegalStateException e) {
             started = true;
         } catch (Throwable e) {