added config and onSlashCommand method

.gitignore

@@ -44,5 +44,5 @@ nbdist/
 # Ignore Gradle build output directory
 build
 
-### Vim ###
-.vim/
+# Credentials
+bot-config.properties

app/bot-config.properties.template

@@ -0,0 +1 @@
+BOT_TOKEN=<put your token here>

app/build.gradle

@@ -45,7 +45,7 @@ dependencies {
 }
 
 application {
-    mainClass = 'com.togetherjava.tjplays.App'
+    mainClass = 'com.togetherjava.tjplays.Bot'
 }
 
 tasks.named('test') {

app/src/main/java/com/togetherjava/tjplays/Bot.java

@@ -0,0 +1,53 @@
+package com.togetherjava.tjplays;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.List;
+import java.util.Properties;
+
+import com.togetherjava.tjplays.listeners.commands.*;
+
+import net.dv8tion.jda.api.JDA;
+import net.dv8tion.jda.api.JDABuilder;
+import net.dv8tion.jda.api.interactions.commands.build.SlashCommandData;
+
+public final class Bot {
+    public static void main(String[] args) throws IOException {
+        Properties properties = readProperties(args);
+
+        String botToken = properties.getProperty("BOT_TOKEN");
+
+        createJDA(botToken);
+    }
+
+    private static Properties readProperties(String... args) throws IOException {
+        Properties properties = new Properties();
+
+        String configPath = args.length == 0 ? "bot-config.properties" : args[0];
+        properties.load(new FileInputStream(configPath));
+
+        return properties;
+    }
+
+    private static JDA createJDA(String botToken) {
+        JDA jda = JDABuilder.createDefault(botToken).build();
+
+        List<SlashCommand> commands = getCommands();
+        commands.forEach(command -> jda.addEventListener(command));
+
+        List<SlashCommandData> commandDatas = commands.stream()
+            .map(SlashCommand::getData)
+            .toList();
+
+        jda.updateCommands().addCommands(commandDatas).queue();
+
+        return jda;
+    }
+
+    private static List<SlashCommand> getCommands() {
+        return List.of(
+            new PingCommand(),
+            new Game2048Command()
+        );
+    }
+}

app/src/main/java/com/togetherjava/tjplays/listeners/commands/Game2048Command.java

@@ -28,8 +28,7 @@ public Game2048Command() {
     }
 
     @Override
-    public void onSlashCommandInteraction(SlashCommandInteractionEvent event) {
-        if (!event.getName().equals(COMMAND_NAME)) return;
+    public void onSlashCommand(SlashCommandInteractionEvent event) {
         Renderer2048 gameRenderer = new Renderer2048(new Game2048());
 
         event.reply(gameMessage(gameRenderer, event.getUser().getId()))

app/src/main/java/com/togetherjava/tjplays/listeners/commands/PingCommand.java

@@ -11,9 +11,7 @@ public PingCommand() {
     }
 
     @Override
-    public void onSlashCommandInteraction(SlashCommandInteractionEvent event) {
-        if (!event.getName().equals(COMMAND_NAME)) return;
-
+    public void onSlashCommand(SlashCommandInteractionEvent event) {
         event.reply("Pong!").queue();
     }
 }

app/src/main/java/com/togetherjava/tjplays/listeners/commands/SlashCommand.java

@@ -17,8 +17,12 @@ public SlashCommandData getData() {
         return data;
     }
 
+    public abstract void onSlashCommand(SlashCommandInteractionEvent event);
+
     @Override
-    abstract public void onSlashCommandInteraction(SlashCommandInteractionEvent event);
+    public final void onSlashCommandInteraction(SlashCommandInteractionEvent event) {
+        if (event.getName().equals(data.getName())) onSlashCommand(event);
+    }
 
     // Should not be implemented
     @Override