Bukkit /插口API：映射销毁器和受害者

Question

我想给销毁器名称添加为重点，和值，进入我的HashMap这就是所谓的damageCheck的受害者的名字。这全部在EntityDamageByEntityEvent完成。但是，当我尝试存储受害者和损害者时，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!"); 
    } 
} 

的第一条消息是正确的。 GetSparked是受害者和Fendyk是损害者。但在第二条消息中，当试图从hashmap中获取名称时，输出的值是错误的。

编辑：我换了 damageCheck.put（victimName，damagerName）; 至 damageCheck.put（damagerName，victimName）;

但它现在给受害者null（第一次击中），为什么？

Answer 1

所以，我测试了这样的一个完整的新方式，因为我真的不知道你指的，反正这是代码，我觉得什么是你真正需要的

无需为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()); 

} 

从散删除实体数据虽然这是不准确的，有时

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

您可以删除只队员检查，它会在任何实体工作 只是删除

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