# net.sf.l2j.Config.java


    /** Party Drop Config */
    public static String NPC_LIST;
    public static int[] NPC_LIST_SET;
    public static Map<Integer, Integer> PARTY_DROP_REWARDS = new HashMap<>();

    NPC_LIST = customs.getProperty("NpcListPartyDrop", "10506,10507");

    String[] NpcList = NPC_LIST.split(",");
    NPC_LIST_SET = new int[NpcList.length];
    for (int i = 0; i < NpcList.length; i++)
        NPC_LIST_SET[i] = Integer.parseInt(NpcList[i]);

    String PARTY_DROP_REWARD_VALUE = customs.getProperty("PartyDropReward", "57,100000000;");
    String[] party_drop_reward_splitted_1 = PARTY_DROP_REWARD_VALUE.split(";");
    for (String i : party_drop_reward_splitted_1)
    {
        String[] party_drop_reward_splitted_2 = i.split(",");
        PARTY_DROP_REWARDS.put(Integer.parseInt(party_drop_reward_splitted_2[1]), Integer.parseInt(party_drop_reward_splitted_2[0]));
    }


# net.sf.l2j.gameserver.scripting.scripts.custom.PartyDrop.java


/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.scripting.scripts.custom;

import java.util.HashMap;
import java.util.List;
import java.util.Set;

import net.sf.l2j.Config;
import net.sf.l2j.gameserver.model.actor.Npc;
import net.sf.l2j.gameserver.model.actor.instance.Player;
import net.sf.l2j.gameserver.scripting.Quest;
import net.sf.l2j.gameserver.network.serverpackets.PlaySound;

public class PartyDrop extends Quest
{
    boolean _canReward = false;
    static HashMap<String, Integer> playerIps = new HashMap<>();

    public PartyDrop()
    {
        super(-1, "custom");

        addKillId(Config.NPC_LIST_SET);
    }

    @Override
    public String onKill(Npc npc, Player player, boolean isPet)
    {
        if (player.isInParty())
        {
            List<Player> party = player.getParty().getMembers();

            for (Player member : party)
            {
                String pIp = member.getClient().getConnection().getInetAddress().getHostAddress();

                if (!playerIps.containsKey(pIp))
                {
                    playerIps.put(pIp, 1);
                    _canReward = true;
                }
                else
                {
                    int count = playerIps.get(pIp);

                    if (count < 1)
                    {
                        playerIps.remove(pIp);
                        playerIps.put(pIp, count + 1);
                        _canReward = true;
                    }
                    else
                    {
                        member.sendMessage("Already 1 member of your ip have been rewarded, so this character won't be rewarded.");
                        _canReward = false;
                    }
                }
                if (_canReward)
                {
                    if (member.isInsideRadius(npc, 1000, false, false))
                    {
                        Set<Integer> rewards = Config.PARTY_DROP_REWARDS.keySet();
                        for (Integer i : rewards)
                        {
                             member.addItem("Party Drop Rewards.", Config.PARTY_DROP_REWARDS.get(i), i, member, true);
                             member.broadcastPacket(new PlaySound("ItemSound.quest_finish"));
                        }
                    }
                    else
                    {
                        member.sendMessage("You are too far to be rewarded.");
                    }
                }
            }
            playerIps.clear();
        }
        else
        {
            Set<Integer> rewards = Config.PARTY_DROP_REWARDS.keySet();
            for (Integer i : rewards)
            {
                 player.addItem("Party Drop Rewards.", Config.PARTY_DROP_REWARDS.get(i), i, player, true);
                 player.broadcastPacket(new PlaySound("ItemSound.quest_finish"));
            }
        }

        return null;
    }

    public static void main(String[] args)
    {
        new PartyDrop();
    }
}


# customs.properties

# Set mobs list ID's for drop items in Party Drop
NpcListPartyDrop = 10506,10507

# Set rewards for drop in monsters of Party Drop
PartyDropReward = 57,50;