Final classes with private constructor

src/main/java/appeng/core/AELog.java

@@ -26,7 +26,7 @@ import appeng.core.features.AEFeature;
 import appeng.tile.AEBaseTile;
 import appeng.util.Platform;
 
-public class AELog
+public final class AELog
 {
 
 	public static final FMLRelaunchLog instance = FMLRelaunchLog.log;

src/main/java/appeng/core/Api.java

@@ -39,7 +39,7 @@ import appeng.me.GridConnection;
 import appeng.me.GridNode;
 import appeng.util.Platform;
 
-public class Api implements IAppEngApi
+public final class Api implements IAppEngApi
 {
 
 	public static final Api INSTANCE = new Api();

src/main/java/appeng/core/features/registries/WorldGenRegistry.java

@@ -25,7 +25,7 @@ import net.minecraft.world.WorldProvider;
 
 import appeng.api.features.IWorldGen;
 
-public class WorldGenRegistry implements IWorldGen
+public final class WorldGenRegistry implements IWorldGen
 {
 
 	private static class TypeSet