java - Bukkit/Spigot API : Mapping damager and Victim

Question

我正在尝试将损坏者名称作为键添加，将受害者名称作为值添加到名为damageCheck。这一切都在 EntityDamageByEntityEvent 中完成。然而，当我尝试存储受害者和破坏者时，一切都出错了。

代码:

    private HashMap<String, String> damageCheck = new HashMap<String, String>();

@EventHandler
public void onEntityDamageByEntityEvent(EntityDamageByEntityEvent event) {

    if(event.getEntity() instanceof Player || event.getDamager() instanceof Player) {
        Player victim = (Player) event.getEntity();
        Player damager = (Player) event.getDamager();

        String victimName = victim.getDisplayName(); // getting the victim name
        String damagerName = damager.getDisplayName(); // getting the damager name

        Bukkit.getServer().broadcastMessage("");
        Bukkit.getServer().broadcastMessage(victim.getDisplayName() + " is the victim!");
        Bukkit.getServer().broadcastMessage(damager.getDisplayName() + " is the damager!");
        Bukkit.getServer().broadcastMessage("");

        try {
            if(!damageCheck.containsKey(damagerName)) {
                damageCheck.put(victimName, damagerName);

                Bukkit.getServer().broadcastMessage("");
                Bukkit.getServer().broadcastMessage(damageCheck.get(victimName) + " is victim!");
                Bukkit.getServer().broadcastMessage(damageCheck.get(damagerName) + " is damager!");
                Bukkit.getServer().broadcastMessage("");
            } else if(damageCheck.containsKey(damagerName)) {
                damageCheck.replace(damagerName, damagerName, damagerName);

                Bukkit.getServer().broadcastMessage("");
                Bukkit.getServer().broadcastMessage(damageCheck.get(victimName) + " is victim!");
                Bukkit.getServer().broadcastMessage(damageCheck.get(damagerName) + " is damager!");
                Bukkit.getServer().broadcastMessage("");
            }
        } catch (NullPointerException e) {
            // do nothing lol
        }

    } else {
        Bukkit.getServer().broadcastMessage("There is no entity or damager!");
    }
}

第一条消息是正确的。 GetSparked 是受害者，Fendyk 是破坏者。但是在第二条消息中，当尝试从 HashMap 中获取名称时，它输出了错误的值。

编辑:我改变了damageCheck.put(victimName, DamagerName);到damageCheck.put(damagerName,victimName);

但现在它给受害者null(第一次击中)，这是为什么？

Answer 1

所以，我正在测试一种全新的方法，因为我不太明白你指的是什么，无论如何，这就是代码，我认为这就是你真正需要的

不需要 new HashMap <String, String>

private HashMap<String, String> damageCheck = new HashMap<>();

代码:

@EventHandler
public void onEntityDamageByEntityEvent(EntityDamageByEntityEvent event) {

    if(!(event.getDamager() instanceof Player) || !(event.getEntity() instanceof Player) ) return;

    String damagerName = event.getDamager().getName();
    String victimName = event.getEntity().getName();

    damageCheck.put(victimName, damagerName);

    Bukkit.broadcastMessage(ChatColor.GRAY + "" + ChatColor.STRIKETHROUGH + "-------------[ X ]-------------");
    Bukkit.broadcastMessage(ChatColor.DARK_AQUA + damagerName + ChatColor.GRAY + " is the damager");
    Bukkit.broadcastMessage(ChatColor.DARK_AQUA + victimName + ChatColor.GRAY + " is the victim");
    Bukkit.broadcastMessage(ChatColor.GRAY + "" + ChatColor.STRIKETHROUGH + "-------------[ X ]-------------");

    Bukkit.getLogger().info(damageCheck.toString());

}

从 HashMap 中删除实体数据尽管有时不准确

@EventHandler
public void onEntityDeathEvent(EntityDeathEvent event){
    damageCheck.remove(event.getEntity().getName());
    damageCheck.remove(event.getEntity().getKiller().getName());
}

您只能删除对玩家的检查，它适用于任何实体 只需删除

if(!(event.getDamager() instanceof Player) || !(event.getEntity() instanceof Player) ) return;