change to getFirst() and getLast()

application/src/main/java/org/togetherjava/tjbot/features/bookmarks/BookmarksListRemoveHandler.java

@@ -314,7 +314,7 @@ Request withSelectedBookmarksToRemove(Set<Long> selectedBookmarkIdsToRemove) {
         }
 
         static Request fromArgs(List<String> args) {
-            RequestType requestType = RequestType.valueOf(args.get(0));
+            RequestType requestType = RequestType.valueOf(args.getFirst());
             String componentName = args.get(1);
             int currentPageIndex = Integer.parseInt(args.get(2));
 

application/src/main/java/org/togetherjava/tjbot/features/code/CodeMessageHandler.java

@@ -152,7 +152,7 @@ private Button createButtonForAction(CodeAction action, long originalMessageId)
 
     @Override
     public void onButtonClick(ButtonInteractionEvent event, List<String> args) {
-        long originalMessageId = Long.parseLong(args.get(0));
+        long originalMessageId = Long.parseLong(args.getFirst());
 
         event.deferEdit().queue();
 

application/src/main/java/org/togetherjava/tjbot/features/filesharing/FileSharingMessageListener.java

@@ -98,7 +98,7 @@ public void onMessageReceived(MessageReceivedEvent event) {
     @Override
     public void onButtonClick(ButtonInteractionEvent event, List<String> args) {
         Member interactionUser = event.getMember();
-        String gistAuthorId = args.get(0);
+        String gistAuthorId = args.getFirst();
         boolean hasSoftModPermissions =
                 interactionUser.getRoles().stream().map(Role::getName).anyMatch(isSoftModRole);
 

application/src/main/java/org/togetherjava/tjbot/features/github/GitHubReference.java

@@ -120,7 +120,7 @@ public void onMessageReceived(MessageReceivedEvent event) {
         List<MessageEmbed> embeds = new ArrayList<>();
 
         while (matcher.find()) {
-            long defaultRepoId = config.getGitHubRepositories().get(0);
+            long defaultRepoId = config.getGitHubRepositories().getFirst();
 
             int issueId = Integer.parseInt(matcher.group(ID_GROUP));
             findIssue(issueId, defaultRepoId).ifPresent(issue -> embeds.add(generateReply(issue)));

application/src/main/java/org/togetherjava/tjbot/features/help/HelpSystemHelper.java

@@ -337,7 +337,7 @@ private static ForumTag requireTag(String tagName, ForumChannel forumChannel) {
                 .formatted(forumChannel.getName(), forumChannel.getGuild().getName(), tagName));
         }
 
-        return matchingTags.get(0);
+        return matchingTags.getFirst();
     }
 
     boolean hasTagManageRole(Member member) {

application/src/main/java/org/togetherjava/tjbot/features/help/HelpThreadCommand.java

@@ -25,6 +25,7 @@
 import java.time.temporal.ChronoUnit;
 import java.util.Arrays;
 import java.util.EnumMap;
+import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
@@ -213,7 +214,7 @@ private void resetActivity(SlashCommandInteractionEvent event, ThreadChannel hel
 
         helpThread.getHistory()
             .retrievePast(1)
-            .map(messages -> messages.get(0))
+            .map(List::getFirst)
             .queue(lastMessage -> manuallyResetChannelActivityCache.put(helpThread.getIdLong(),
                     lastMessage.getIdLong()));
 

application/src/main/java/org/togetherjava/tjbot/features/help/HelpThreadCreatedListener.java

@@ -179,7 +179,7 @@ private boolean isPostAuthor(Member interactionUser, Message message) {
         }
 
         String embedAuthor = Objects
-            .requireNonNull(message.getEmbeds().get(0).getAuthor(),
+            .requireNonNull(message.getEmbeds().getFirst().getAuthor(),
                     "embed author for forum post is null")
             .getName();
 

application/src/main/java/org/togetherjava/tjbot/features/jshell/renderer/RendererUtils.java

@@ -59,8 +59,7 @@ static GeneralStatus getGeneralStatus(JShellResult result) {
             return GeneralStatus.PARTIAL_SUCCESS; // At least one snippet is a success
         }
 
-        return getGeneralStatus(
-                result.snippetsResults().get(result.snippetsResults().size() - 1).status());
+        return getGeneralStatus(result.snippetsResults().getLast().status());
     }
 
     static Color getStatusColor(JShellResult result) {

application/src/main/java/org/togetherjava/tjbot/features/mathcommands/TeXCommand.java

@@ -164,7 +164,7 @@ private boolean isInvalidInlineFormat(String latex) {
 
     @Override
     public void onButtonClick(final ButtonInteractionEvent event, final List<String> args) {
-        if (!args.get(0).equals(Objects.requireNonNull(event.getMember()).getId())) {
+        if (!args.getFirst().equals(Objects.requireNonNull(event.getMember()).getId())) {
             event.reply("You are not the person who executed the command, you cannot do that")
                 .setEphemeral(true)
                 .queue();

application/src/main/java/org/togetherjava/tjbot/features/moderation/ReportCommand.java

@@ -223,7 +223,7 @@ private static String createUserReply(Result<Message> result) {
     private record ReportedMessage(String content, String id, String jumpUrl, String channelID,
             Instant timestamp, String authorName, String authorAvatarUrl) {
         static ReportedMessage ofArgs(List<String> args) {
-            String content = args.get(0);
+            String content = args.getFirst();
             String id = args.get(1);
             String jumpUrl = args.get(2);
             String channelID = args.get(3);

application/src/main/java/org/togetherjava/tjbot/features/moderation/TransferQuestionCommand.java

@@ -95,7 +95,7 @@ public void onMessageContext(MessageContextInteractionEvent event) {
         String originalMessageId = event.getTarget().getId();
         String originalChannelId = event.getTarget().getChannel().getId();
         String authorId = event.getTarget().getAuthor().getId();
-        String mostCommonTag = tags.get(0);
+        String mostCommonTag = tags.getFirst();
         String chatGptPrompt =
                 "Summarize the following text into a concise title or heading not more than 4-5 words, remove quotations if any: %s"
                     .formatted(originalMessage);
@@ -142,7 +142,7 @@ public void onMessageContext(MessageContextInteractionEvent event) {
     public void onModalSubmitted(ModalInteractionEvent event, List<String> args) {
         event.deferReply(true).queue();
 
-        String authorId = args.get(0);
+        String authorId = args.getFirst();
         String messageId = args.get(1);
         String channelId = args.get(2);
         ForumChannel helperForum = getHelperForum(event.getJDA());
@@ -226,13 +226,13 @@ private RestAction<ForumPostData> createForumPost(ModalInteractionEvent event,
         String transferQuestionTag = event.getValue(MODAL_TAG).getAsString();
 
         ForumChannel questionsForum = getHelperForum(event.getJDA());
-        String mostCommonTag = tags.get(0);
+        String mostCommonTag = tags.getFirst();
 
         String queryTag =
                 StringDistances.closestMatch(transferQuestionTag, tags).orElse(mostCommonTag);
 
         ForumTag tag = getTagOrDefault(questionsForum.getAvailableTagsByName(queryTag, true),
-                () -> questionsForum.getAvailableTagsByName(mostCommonTag, true).get(0));
+                () -> questionsForum.getAvailableTagsByName(mostCommonTag, true).getFirst());
 
         return questionsForum.createForumPost(forumTitle, forumMessage)
             .setTags(ForumTagSnowflake.fromId(tag.getId()))
@@ -279,7 +279,7 @@ private ForumChannel getHelperForum(JDA jda) {
 
     private static ForumTag getTagOrDefault(List<ForumTag> tagsFoundOnForum,
             Supplier<ForumTag> defaultTag) {
-        return tagsFoundOnForum.isEmpty() ? defaultTag.get() : tagsFoundOnForum.get(0);
+        return tagsFoundOnForum.isEmpty() ? defaultTag.get() : tagsFoundOnForum.getFirst();
     }
 
     private MessageEmbed makeEmbedForPost(User originalUser, String originalMessage) {

application/src/main/java/org/togetherjava/tjbot/features/moderation/audit/AuditCommand.java

@@ -133,7 +133,7 @@ private List<List<ActionRecord>> groupActionsByPages(List<ActionRecord> actions)
                 groupedActions.add(new ArrayList<>(AuditCommand.MAX_PAGE_LENGTH));
             }
 
-            groupedActions.get(groupedActions.size() - 1).add(actions.get(i));
+            groupedActions.getLast().add(actions.get(i));
         }
 
         return groupedActions;
@@ -271,7 +271,7 @@ public void onButtonClick(ButtonInteractionEvent event, List<String> args) {
         int currentPage = Integer.parseInt(args.get(3));
         int turnPageBy = Integer.parseInt(args.get(4));
 
-        long guildId = Long.parseLong(args.get(0));
+        long guildId = Long.parseLong(args.getFirst());
         long targetId = Long.parseLong(args.get(1));
         int pageToDisplay = currentPage + turnPageBy;
 

application/src/main/java/org/togetherjava/tjbot/features/moderation/audit/ModAuditLogRoutine.java

@@ -154,8 +154,7 @@ private static Instant computeClosestNextScheduleDate(Instant instant,
         List<Instant> scheduleDates = scheduleHours.stream()
             .map(hour -> dateAtTime.apply(offsetDateTime, hour))
             .collect(Collectors.toCollection(ArrayList::new));
-        int rolloverHour =
-                (scheduleHours.get(scheduleHours.size() - 1) + periodHours) % HOURS_OF_DAY;
+        int rolloverHour = (scheduleHours.getLast() + periodHours) % HOURS_OF_DAY;
         scheduleDates.add(dateAtTime.apply(offsetDateTime.plusDays(1), rolloverHour));
 
         return scheduleDates.stream()

application/src/main/java/org/togetherjava/tjbot/features/moderation/modmail/ModMailCommand.java

@@ -135,7 +135,7 @@ public void onModalSubmitted(ModalInteractionEvent event, List<String> args) {
         String userMessage = event.getValue(OPTION_MESSAGE).getAsString();
         long userId = event.getUser().getIdLong();
 
-        long userGuildId = Long.parseLong(args.get(0));
+        long userGuildId = Long.parseLong(args.getFirst());
         boolean wantsToStayAnonymous = Boolean.parseBoolean(args.get(1));
 
         Optional<TextChannel> modMailAuditLog = getModMailChannel(event.getJDA(), userGuildId);

application/src/main/java/org/togetherjava/tjbot/features/moderation/scam/ScamBlocker.java

@@ -362,7 +362,7 @@ private record ComponentIdArguments(ScamBlockerConfig.Mode mode, long guildId, l
             long messageId, long authorId, String contentHash) {
 
         static ComponentIdArguments fromList(List<String> args) {
-            ScamBlockerConfig.Mode mode = ScamBlockerConfig.Mode.valueOf(args.get(0));
+            ScamBlockerConfig.Mode mode = ScamBlockerConfig.Mode.valueOf(args.getFirst());
             long guildId = Long.parseLong(args.get(1));
             long channelId = Long.parseLong(args.get(2));
             long messageId = Long.parseLong(args.get(3));

application/src/main/java/org/togetherjava/tjbot/features/reminder/ReminderCommand.java

@@ -124,7 +124,7 @@ public void onSlashCommand(SlashCommandInteractionEvent event) {
 
     @Override
     public void onButtonClick(ButtonInteractionEvent event, List<String> args) {
-        int pageToShow = Integer.parseInt(args.get(0));
+        int pageToShow = Integer.parseInt(args.getFirst());
 
         EmojiUnion emoji = event.getButton().getEmoji();
         if (PREVIOUS_BUTTON_EMOJI.equals(emoji)) {

application/src/main/java/org/togetherjava/tjbot/features/utils/RateLimiter.java

@@ -76,7 +76,7 @@ public Instant nextAllowedRequestTime(Instant time) {
                 return Instant.now();
             }
 
-            return currentUses.get(0).plus(duration);
+            return currentUses.getFirst().plus(duration);
         }
     }
 

application/src/test/java/org/togetherjava/tjbot/features/reminder/ReminderCommandTest.java

@@ -118,7 +118,7 @@ void userIsNotLimitedIfOtherUserHasTooManyPendingReminders() {
 
         List<String> remindersOfSecondUser = rawReminders.readReminders(secondUser);
         assertEquals(1, remindersOfSecondUser.size());
-        assertEquals("foo", remindersOfSecondUser.get(0));
+        assertEquals("foo", remindersOfSecondUser.getFirst());
     }
 
     @Test
@@ -133,6 +133,6 @@ void canCreateReminders() {
 
         List<String> pendingReminders = rawReminders.readReminders();
         assertEquals(1, pendingReminders.size());
-        assertEquals("foo", pendingReminders.get(0));
+        assertEquals("foo", pendingReminders.getFirst());
     }
 }

application/src/test/java/org/togetherjava/tjbot/jda/ButtonClickEventBuilder.java

@@ -221,7 +221,7 @@ private static Button requireSingleButton(List<? extends Button> buttons) {
                     + " Either only use a single button or explicitly state the clicked button");
         }
 
-        return buttons.get(0);
+        return buttons.getFirst();
     }
 
     private ButtonInteractionEvent mockButtonClickEvent(Message message, Button clickedButton) {

formatter/src/main/java/org/togetherjava/tjbot/formatter/formatting/FormatterRules.java

@@ -229,7 +229,7 @@ static String patchMultiLineComment(String content, String indent) {
         /*
          * Example multi-line comment
          */
-        String firstLine = lines.get(0);
+        String firstLine = lines.getFirst();
         List<String> otherLines = lines.subList(1, lines.size());
 
         String otherLinesText = otherLines.stream()

formatter/src/test/java/org/togetherjava/tjbot/formatter/tokenizer/LexerTest.java

@@ -67,7 +67,7 @@ void keywordVersusIdentifier() {
     @DisplayName("Each token must be recognized by the expected content and not hidden by another token that prefixes it.")
     void typesAreNotHidden(TokenType expectedTokenType) {
         String text = expectedTokenType.getContentExample();
-        TokenType actualTokenType = tokenize(text).get(0);
+        TokenType actualTokenType = tokenize(text).getFirst();
 
         assertEquals(expectedTokenType, actualTokenType, "Tested on: " + text);
     }