为什么不激活“EntityDamageByEntityEvent”？

Question

public void onEntityDamageByEntity(EntityDamageByEntityEvent event) {

        if (((event.getEntity() instanceof Player)) && ((event.getDamager() instanceof Player))) {
            Player player = (Player)event.getEntity();
            Player damager = (Player)event.getDamager();
            for(int i = 0; i < teams2.size(); i++){
                if((teams2.get(i).player1 == player || teams2.get(i).player2 == player) && (teams2.get(i).player1 == damager || teams2.get(i).player2 == damager)){
                    event.setCancelled(true);
                }
            }
        }
        else if (((event.getEntity() instanceof Arrow)) && ((event.getDamager() instanceof Player))) {
            Entity arrow = event.getEntity();
            if ((((Projectile)arrow).getShooter() instanceof Player)) {
                Player player = (Player)arrow;
                Player damager = (Player)event.getDamager();
                for(int i = 0; i < teams2.size(); i++){
                    if((teams2.get(i).player1 == player || teams2.get(i).player2 == player) && (teams2.get(i).player1 == damager || teams2.get(i).player2 == damager)){
                        event.setCancelled(true);
                    }
                }
            }
        }
    }

它应该取消比赛，这样同一队的球员就不能互相攻击，但事实并非如此。为什么？您还可以建议创建FriendlyFire函数的其他方法。

Answer 1

由于您没有发布完整的源码，我将从一个简单的问题开始，许多新接触Bukkit编程的人都会做错（我有时也会遇到）：您注册了事件吗？

public class YourPlugin extends JavaPlugin {

    @Override
    public void onEnable() {
        super.onEnable();
        Bukkit.getServer().getPluginManager().registerEvents(listener, this);
    }

}

Listener是侦听器类的实例。因此，如果您在您的MainClass中的问题中发布了这段代码，它应该如下所示：

public class YourPlugin extends JavaPlugin implements Listener {

    @Override
    public void onEnable() {
        super.onEnable();
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void onEntityDamageByEntity(EntityDamageByEntityEvent event) {
        //your event
    }

}

如果您有一个分离类，它应该如下所示：

public class YourPlugin extends JavaPlugin {

    @Override
    public void onEnable() {
        super.onEnable();
        Bukkit.getServer().getPluginManager().registerEvents(new YourListener(), this);
    }

}

public class YourListener implements Listener {

    @EventHandler
    public void onEntityDamageByEntity(EntityDamageByEntityEvent event) {
        //your event
    }

}

@EventHandler
public void onEntityDamageByEntity(EntityDamageByEntityEvent e) {
    if (!(e.getEntity() instanceof Player)) return;
    Player player = (Player) e.getEntity();
    Player damager;
    if (e.getDamager() instanceof Arrow) {
        Arrow a = (Arrow) e.getDamager();
        if (!(a.getShooter() instanceof Player)) return;
        damager = (Player) a.getShooter();
    } else {
        if (!(e.getDamager() instanceof Player)) return;
        damager = (Player) e.getDamager();
    }
    for (Team t : teams2) {
        if ((t.player1 == player || t.player2 == player) && (t.player1 == damager || t.player2 == damager)) {
            e.setCancelled(true);
        }
    }
}