refactor: replace size() == 0 with isEmpty()

src/main/java/emu/grasscutter/command/commands/AchievementCommand.java

@@ -69,7 +69,7 @@ public final class AchievementCommand implements CommandHandler {
 
     @Override
     public void execute(Player sender, Player targetPlayer, List<String> args) {
-        if (args.size() < 1) {
+        if (args.isEmpty()) {
             this.sendUsageMessage(sender);
             return;
         }
@@ -88,7 +88,7 @@ public final class AchievementCommand implements CommandHandler {
 
     private void grant(
             Player sender, Player targetPlayer, Achievements achievements, List<String> args) {
-        if (args.size() < 1) {
+        if (args.isEmpty()) {
             this.sendUsageMessage(sender);
         }
 
@@ -109,7 +109,7 @@ public final class AchievementCommand implements CommandHandler {
 
     private void revoke(
             Player sender, Player targetPlayer, Achievements achievements, List<String> args) {
-        if (args.size() < 1) {
+        if (args.isEmpty()) {
             this.sendUsageMessage(sender);
         }
 

src/main/java/emu/grasscutter/command/commands/AnnounceCommand.java

@@ -19,7 +19,7 @@ public final class AnnounceCommand implements CommandHandler {
     @Override
     public void execute(Player sender, Player targetPlayer, List<String> args) {
         var manager = Grasscutter.getGameServer().getAnnouncementSystem();
-        if (args.size() < 1) {
+        if (args.isEmpty()) {
             sendUsageMessage(sender);
             return;
         }

src/main/java/emu/grasscutter/command/commands/ClearCommand.java

@@ -51,7 +51,7 @@ public final class ClearCommand implements CommandHandler {
         // Extract any tagged int arguments (e.g. "lv90", "x100", "r5")
         parseIntParameters(args, param, intCommandHandlers);
 
-        if (args.size() < 1) {
+        if (args.isEmpty()) {
             sendUsageMessage(sender);
             return;
         }

src/main/java/emu/grasscutter/command/commands/EnterDungeonCommand.java

@@ -16,7 +16,7 @@ public final class EnterDungeonCommand implements CommandHandler {
 
     @Override
     public void execute(Player sender, Player targetPlayer, List<String> args) {
-        if (args.size() < 1) {
+        if (args.isEmpty()) {
             sendUsageMessage(sender);
             return;
         }

src/main/java/emu/grasscutter/command/commands/GiveCommand.java

@@ -279,7 +279,7 @@ public final class GiveCommand implements CommandHandler {
         parseIntParameters(args, param, intCommandHandlers);
 
         // At this point, first remaining argument MUST be itemId/avatarId
-        if (args.size() < 1) {
+        if (args.isEmpty()) {
             sendUsageMessage(sender); // Reachable if someone does `/give lv90` or similar
             throw new IllegalArgumentException();
         }
@@ -362,7 +362,7 @@ public final class GiveCommand implements CommandHandler {
 
     @Override
     public void execute(Player sender, Player targetPlayer, List<String> args) {
-        if (args.size() < 1) { // *No args*
+        if (args.isEmpty()) { // *No args*
             sendUsageMessage(sender);
             return;
         }

src/main/java/emu/grasscutter/command/commands/ListCommand.java

@@ -19,14 +19,14 @@ public final class ListCommand implements CommandHandler {
         Map<Integer, Player> playersMap = Grasscutter.getGameServer().getPlayers();
         boolean needUID = false;
 
-        if (args.size() > 0) {
+        if (!args.isEmpty()) {
             needUID = args.get(0).equals("uid");
         }
 
         CommandHandler.sendMessage(
                 sender, translate(sender, "commands.list.success", playersMap.size()));
 
-        if (playersMap.size() != 0) {
+        if (!playersMap.isEmpty()) {
             StringBuilder playerSet = new StringBuilder();
             boolean finalNeedUID = needUID;
 

src/main/java/emu/grasscutter/command/commands/ResetConstCommand.java

@@ -18,7 +18,7 @@ public final class ResetConstCommand implements CommandHandler {
 
     @Override
     public void execute(Player sender, Player targetPlayer, List<String> args) {
-        if (args.size() > 0 && args.get(0).equalsIgnoreCase("all")) {
+        if (!args.isEmpty() && args.get(0).equalsIgnoreCase("all")) {
             targetPlayer.getAvatars().forEach(this::resetConstellation);
             CommandHandler.sendMessage(sender, translate(sender, "commands.resetConst.reset_all"));
         } else {

src/main/java/emu/grasscutter/command/commands/SendMailCommand.java

@@ -69,7 +69,7 @@ public final class SendMailCommand implements CommandHandler {
         } else {
             MailBuilder mailBuilder = mailBeingConstructed.get(senderId);
 
-            if (args.size() >= 1) {
+            if (!args.isEmpty()) {
                 switch (args.get(0).toLowerCase()) {
                     case "stop" -> {
                         mailBeingConstructed.remove(senderId);

src/main/java/emu/grasscutter/command/commands/SendMessageCommand.java

@@ -17,7 +17,7 @@ public final class SendMessageCommand implements CommandHandler {
 
     @Override
     public void execute(Player sender, Player targetPlayer, List<String> args) {
-        if (args.size() == 0) {
+        if (args.isEmpty()) {
             sendUsageMessage(sender);
             return;
         }

src/main/java/emu/grasscutter/command/commands/SetConstCommand.java

@@ -17,7 +17,7 @@ import java.util.List;
 public final class SetConstCommand implements CommandHandler {
     @Override
     public void execute(Player sender, Player targetPlayer, List<String> args) {
-        if (args.size() < 1) {
+        if (args.isEmpty()) {
             sendUsageMessage(sender);
             return;
         }

src/main/java/emu/grasscutter/command/commands/SpawnCommand.java

@@ -49,7 +49,7 @@ public final class SpawnCommand implements CommandHandler {
         parseIntParameters(args, param, intCommandHandlers);
 
         // At this point, first remaining argument MUST be the id and the rest the pos
-        if (args.size() < 1) {
+        if (args.isEmpty()) {
             sendUsageMessage(sender); // Reachable if someone does `/give lv90` or similar
             throw new IllegalArgumentException();
         }

src/main/java/emu/grasscutter/command/commands/TalentCommand.java

@@ -27,7 +27,7 @@ public final class TalentCommand implements CommandHandler {
 
     @Override
     public void execute(Player sender, Player targetPlayer, List<String> args) {
-        if (args.size() < 1) {
+        if (args.isEmpty()) {
             sendUsageMessage(sender);
             return;
         }