fix checkstyle

Author: jasonlessenich

src/main/java/net/javadiscord/javabot/systems/user_preferences/commands/PreferencesListSubcommand.java

@@ -9,13 +9,9 @@
 import net.javadiscord.javabot.Bot;
 import net.javadiscord.javabot.systems.user_preferences.UserPreferenceService;
 import net.javadiscord.javabot.systems.user_preferences.model.Preference;
-import net.javadiscord.javabot.systems.user_preferences.model.UserPreference;
 import net.javadiscord.javabot.util.Responses;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.Arrays;
-import java.util.stream.Collectors;
-
 /**
  * <h3>This class represents the /preferences list command.</h3>
  */

src/main/java/net/javadiscord/javabot/systems/user_preferences/model/BooleanPreference.java

@@ -2,7 +2,10 @@
 
 import net.dv8tion.jda.api.interactions.commands.Command;
 
-public final class BooleanPreference implements PreferenceType{
+/**
+ * Represents a {@link Preference} of the {@link Boolean} type.
+ */
+public final class BooleanPreference implements PreferenceType {
 	@Override
 	public String[] getAllowedChoices() {
 		return new String[]{

src/main/java/net/javadiscord/javabot/systems/user_preferences/model/PreferenceType.java

@@ -2,6 +2,9 @@
 
 import net.dv8tion.jda.api.interactions.commands.Command;
 
+/**
+ * Interface used by different Preference Types. This holds the default and allowed choices.
+ */
 public interface PreferenceType {
 	default String[] getAllowedChoices() {
 		return new String[0];

src/main/java/net/javadiscord/javabot/systems/user_preferences/model/StringPreference.java

@@ -1,3 +1,6 @@
 package net.javadiscord.javabot.systems.user_preferences.model;
 
+/**
+ * Represents a {@link Preference} of the {@link String} type.
+ */
 public final class StringPreference implements PreferenceType {}