Code style: move private constructors for singleton classes to the top of the file

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/CompatibilityUtil.java

@@ -42,6 +42,8 @@ import java.util.Set;
  * Utility class for converting between Sponge and LuckPerms context and tristate classes
  */
 public final class CompatibilityUtil {
+    private CompatibilityUtil() {}
+
     private static final Set<Context> EMPTY = ImmutableSet.of();
 
     public static ImmutableContextSet convertContexts(Set<Context> contexts) {
@@ -92,6 +94,4 @@ public final class CompatibilityUtil {
         }
     }
 
-    private CompatibilityUtil() {}
-
 }

sponge/src/main/java/me/lucko/luckperms/sponge/commands/SpongeCommandUtils.java

@@ -36,6 +36,7 @@ import java.util.List;
 import java.util.Map;
 
 public final class SpongeCommandUtils {
+    private SpongeCommandUtils() {}
 
     public static Tristate parseTristate(int index, List<String> args) throws ArgumentParser.ArgumentException {
         String s = args.get(index).toLowerCase();
@@ -90,6 +91,4 @@ public final class SpongeCommandUtils {
         return MessageUtils.contextSetToString(localeManager, set);
     }
 
-    private SpongeCommandUtils() {}
-
 }

sponge/src/main/java/me/lucko/luckperms/sponge/service/ProxyFactory.java

@@ -42,6 +42,8 @@ import org.spongepowered.api.service.permission.SubjectData;
  * Provides proxy instances which implement the SpongeAPI using the LuckPerms model.
  */
 public final class ProxyFactory {
+    private ProxyFactory() {}
+
     private static final boolean IS_API_7 = isApi7();
     private static boolean isApi7() {
         try {
@@ -89,6 +91,4 @@ public final class ProxyFactory {
                 me.lucko.luckperms.sponge.service.proxy.api6.DescriptionBuilder.registerDescription(service, description);
     }
 
-    private ProxyFactory() {}
-
 }

sponge/src/main/java/me/lucko/luckperms/sponge/service/inheritance/SubjectInheritanceGraphs.java

@@ -31,8 +31,9 @@ import me.lucko.luckperms.sponge.service.model.calculated.CalculatedSubject;
 import java.util.stream.Collectors;
 
 public final class SubjectInheritanceGraphs {
-    private static final SubjectInheritanceGraph NON_CONTEXTUAL = new NonContextual();
+    private SubjectInheritanceGraphs() {}
 
+    private static final SubjectInheritanceGraph NON_CONTEXTUAL = new NonContextual();
 
     public static SubjectInheritanceGraph getGraph() {
         return NON_CONTEXTUAL;
@@ -73,6 +74,4 @@ public final class SubjectInheritanceGraphs {
                     .collect(Collectors.toList());
         }
     }
-
-    private SubjectInheritanceGraphs() {}
 }