EventListener.java

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package com.mycompany.greenninja.listeners;

import net.dv8tion.jda.api.entities.User;
import net.dv8tion.jda.api.entities.channel.unions.MessageChannelUnion;
import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
import net.dv8tion.jda.api.events.message.react.MessageReactionAddEvent;
import net.dv8tion.jda.api.hooks.ListenerAdapter;
import org.jetbrains.annotations.NotNull;
/**
 *
 * @author Abhinav Pothuri
 */
public class EventListener extends ListenerAdapter
{
    @Override
    public void onMessageReactionAdd(@NotNull MessageReactionAddEvent event)
    {
        User user = event.getUser();
        String emoji = event.getReaction().getEmoji().getAsReactionCode();
        String channelMention = event.getChannel().getAsMention();
        
        String response = user.getAsMention() + " reacted to a message" + " with " + emoji + " in " + channelMention + ".";
        event.getChannel().sendMessage(response).queue();
     }
    
    @Override
    public void onMessageReceived(@NotNull MessageReceivedEvent event)
    {
        String message = event.getMessage().getContentRaw();
        if(message.contains("$Ping"))
        {
            event.getChannel().sendMessage("Pong").queue();
        }
    }
}