avoid unchecked casts due by premature casting of Class objects

jme3-android/src/main/java/com/jme3/app/AndroidHarness.java

@@ -239,9 +239,8 @@ public class AndroidHarness extends Activity implements TouchListener, DialogInt
             // Create application instance
             try {
                 if (app == null) {
-                    @SuppressWarnings("unchecked")
-                    Class<? extends LegacyApplication> clazz = (Class<? extends LegacyApplication>) Class.forName(appClass);
-                    app = clazz.newInstance();
+                    Class clazz = Class.forName(appClass);
+                    app = (LegacyApplication)clazz.newInstance();
                 }
 
                 app.setSettings(settings);

jme3-android/src/main/java/com/jme3/app/AndroidHarnessFragment.java

@@ -257,9 +257,8 @@ public class AndroidHarnessFragment extends Fragment implements
         // Create application instance
         try {
             if (app == null) {
-                @SuppressWarnings("unchecked")
-                Class<? extends LegacyApplication> clazz = (Class<? extends LegacyApplication>) Class.forName(appClass);
-                app = clazz.newInstance();
+                Class clazz = Class.forName(appClass);
+                app = (LegacyApplication)clazz.newInstance();
             }
 
             app.setSettings(settings);

jme3-desktop/src/main/java/com/jme3/app/AppletHarness.java

@@ -103,8 +103,8 @@ public class AppletHarness extends Applet {
         JmeSystem.setLowPermissions(true);
 
         try{
-            Class<? extends LegacyApplication> clazz = (Class<? extends LegacyApplication>) Class.forName(appClass);
-            app = clazz.newInstance();
+            Class clazz = Class.forName(appClass);
+            app = (LegacyApplication) clazz.newInstance();
         }catch (ClassNotFoundException ex){
             ex.printStackTrace();
         }catch (InstantiationException ex){

jme3-desktop/src/main/java/com/jme3/system/JmeDesktopSystem.java

@@ -193,22 +193,22 @@ public class JmeDesktopSystem extends JmeSystemDelegate {
 
     private JmeContext newContextLwjgl(AppSettings settings, JmeContext.Type type) {
         try {
-            Class<? extends JmeContext> ctxClazz = null;
+            Class ctxClazz = null;
             switch (type) {
                 case Canvas:
-                    ctxClazz = (Class<? extends JmeContext>) Class.forName("com.jme3.system.lwjgl.LwjglCanvas");
+                    ctxClazz = Class.forName("com.jme3.system.lwjgl.LwjglCanvas");
                     break;
                 case Display:
-                    ctxClazz = (Class<? extends JmeContext>) Class.forName("com.jme3.system.lwjgl.LwjglDisplay");
+                    ctxClazz = Class.forName("com.jme3.system.lwjgl.LwjglDisplay");
                     break;
                 case OffscreenSurface:
-                    ctxClazz = (Class<? extends JmeContext>) Class.forName("com.jme3.system.lwjgl.LwjglOffscreenBuffer");
+                    ctxClazz = Class.forName("com.jme3.system.lwjgl.LwjglOffscreenBuffer");
                     break;
                 default:
                     throw new IllegalArgumentException("Unsupported context type " + type);
             }
 
-            return ctxClazz.newInstance();
+            return (JmeContext) ctxClazz.newInstance();
         } catch (InstantiationException ex) {
             logger.log(Level.SEVERE, "Failed to create context", ex);
         } catch (IllegalAccessException ex) {
@@ -225,9 +225,8 @@ public class JmeDesktopSystem extends JmeSystemDelegate {
         try {
             String className = settings.getRenderer().substring("CUSTOM".length());
 
-            Class<? extends JmeContext> ctxClazz = null;
-            ctxClazz = (Class<? extends JmeContext>) Class.forName(className);
-            return ctxClazz.newInstance();
+            Class ctxClazz = Class.forName(className);
+            return (JmeContext) ctxClazz.newInstance();
         } catch (InstantiationException ex) {
             logger.log(Level.SEVERE, "Failed to create context", ex);
         } catch (IllegalAccessException ex) {

jme3-examples/src/main/java/jme3test/awt/AppHarness.java

@@ -79,8 +79,8 @@ public class AppHarness extends Applet {
         JmeSystem.setLowPermissions(true);
 
         try{
-            Class<? extends LegacyApplication> clazz = (Class<? extends LegacyApplication>) Class.forName(appClass);
-            app = clazz.newInstance();
+            Class clazz = Class.forName(appClass);
+            app = (LegacyApplication) clazz.newInstance();
         }catch (ClassNotFoundException ex){
             ex.printStackTrace();
         }catch (InstantiationException ex){

jme3-examples/src/main/java/jme3test/awt/TestApplet.java

@@ -62,8 +62,8 @@ public class TestApplet extends Applet {
         JmeSystem.setLowPermissions(true);
 
         try{
-            Class<? extends LegacyApplication> clazz = (Class<? extends LegacyApplication>) Class.forName(appClass);
-            app = clazz.newInstance();
+            Class clazz = Class.forName(appClass);
+            app = (LegacyApplication) clazz.newInstance();
         }catch (ClassNotFoundException ex){
             ex.printStackTrace();
         }catch (InstantiationException ex){

jme3-examples/src/main/java/jme3test/awt/TestCanvas.java

@@ -209,8 +209,8 @@ public class TestCanvas {
         settings.setHeight(480);
 
         try{
-            Class<? extends LegacyApplication> clazz = (Class<? extends LegacyApplication>) Class.forName(appClass);
-            app = clazz.newInstance();
+            Class clazz = Class.forName(appClass);
+            app = (LegacyApplication)clazz.newInstance();
         }catch (ClassNotFoundException ex){
             ex.printStackTrace();
         }catch (InstantiationException ex){