Java Bukkit插件编码不起作用?
首先,我对Java是新手。这是我的第一个bukkit插件,唯一的错误是这个()。该插件的目标是,当你右键点击“基石断路器”时,它会打破基石Java Bukkit插件编码不起作用?,java,events,plugins,minecraft,bukkit,Java,Events,Plugins,Minecraft,Bukkit,首先,我对Java是新手。这是我的第一个bukkit插件,唯一的错误是这个()。该插件的目标是,当你右键点击“基石断路器”时,它会打破基石 package me.jrneulight.bedrockbreaker; import org.bukkit.ChatColor; import org.bukkit.Material; import org.bukkit.command.Command; import org.bukkit.command.CommandSender; import
package me.jrneulight.bedrockbreaker;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockBreakEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;
public final class Main extends JavaPlugin implements Listener {
public static void main(String[] args) {
}
@Override
public void onEnable() {
getLogger().info("Breakrock Breaker Enabled!");
getServer().getPluginManager().registerEvents(this, this);
}
@Override
public void onDisable() {
getLogger().info("Bedrock Breaker Disabled!");
}
@Override
public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){
if(cmd.getName().equalsIgnoreCase("bedrockbreaker")){
Player player = (Player) sender;
PlayerInventory inventory = player.getInventory();
ItemStack bedrockbreaker = new ItemStack(Material.DIAMOND_HOE,1);
ItemMeta im = bedrockbreaker.getItemMeta();
im.setDisplayName(ChatColor.DARK_AQUA + "Bedrock Breaker");
bedrockbreaker.setItemMeta(im);
inventory.addItem(bedrockbreaker);
return true;
}
return false;
}
@EventHandler(priority=EventPriority.HIGH)
public void onPlayerUse (org.bukkit.event.player.PlayerInteractEvent evnt) {
org.bukkit.block.Block block = evnt.getClickedBlock();
org.bukkit.inventory.ItemStack item = evnt.getItem();
Player player = evnt.getPlayer();
org.bukkit.World world = block.getWorld();
ItemMeta itemmeta = item.getItemMeta();
if (block.getType() == Material.BEDROCK && item.getType() == Material.DIAMOND_HOE && itemmeta.getDisplayName() == ChatColor.DARK_AQUA + "Bedrock Breaker") {
BlockBreakEvent breakEvent = new BlockBreakEvent(block, player);
getServer().getPluginManager().callEvent(breakEvent);
ItemStack drop = new ItemStack(block.getType());
drop.setAmount(1);
drop.setType(Material.BEDROCK);
block.setType(Material.AIR);
world.dropItemNaturally(block.getLocation(), drop);
player.sendMessage("Bedrock Broken!");
}
}
}
从您的错误中可以看出,这里:
Caused by: java.lang.NullPointerException
at me.jrneulight.bedrockbreaker.Main.onPlayerUse(Main.java:54)
您将在第54行的Main
文件中获得一个NullPointer
。这意味着第54行的值是空的。首先,让我从改进onPlayerUse
开头的代码开始。您不必使用org.bukkit.block.block
,只需使用block block=evnt.getClickedBlock()
org.bukkit.inventory.ItemStack也一样,您只需要使用ItemStack
错误是由您的方法在未单击块时尝试单击块,或在未使用块时尝试使用项引起的。以下是您应该使用的代码:
@EventHandler(priority=EventPriority.HIGH)
public void onPlayerUse (PlayerInteractEvent evnt) {
if(evnt.getAction().equals(Action.LEFT_CLICK_BLOCK){//make sure that they are infact hitting a block
if(evt.getItem() == new ItemStack(Material.DIAMOND_HOE)){ //make sure they are using a diamond hoe
Block block = evnt.getClickedBlock();
//ItemStack item = evnt.getItem();
//we don't need the above line any more
Player player = evnt.getPlayer();
World world = block.getWorld();
ItemMeta itemmeta = item.getItemMeta();
}
}
}
因此,对于整个onPlayerUse
方法,您应该使用以下代码:
@EventHandler(priority=EventPriority.HIGH)
public void onPlayerUse (PlayerInteractEvent evnt) {
if(evnt.getAction().equals(Action.LEFT_CLICK_BLOCK)){//make sure that they are infact hitting a block
if(evnt.getItem() == new ItemStack(Material.DIAMOND_HOE)){ //make sure they are using a diamond hoe
if(evnt.getItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Bedrock Breaker")){ //make sure the name of the diamond hoe is "Bedrock Breaker" in DARK_AQUA
Block block = evnt.getClickedBlock();
World world = block.getWorld();
Player player = evnt.getPlayer();
if(block.getType() == Material.BEDROCK){ //make sure the block clicked is bedrock
BlockBreakEvent breakEvent = new BlockBreakEvent(block, player);
Bukkit.getServer().getPluginManager().callEvent(breakEvent);
ItemStack drop = new ItemStack(block.getType());
drop.setAmount(1);
drop.setType(Material.BEDROCK);
block.setType(Material.AIR);
world.dropItemNaturally(block.getLocation(), drop);
player.sendMessage("Bedrock Broken!");
}
}
}
}
}
您需要使用.equals(String)
而不是==String
检查名称。此外,您应该首先检查大多数需求,以减少延迟
你之所以会犯这个错误,是因为你没有确定他们击中了一个方块,所以,在你的代码中,当玩家做任何动作时(踩在压盘上,右击一个项目,击中空气),它称为你的代码。这就是为什么您需要确保他们正在使用操作左键单击块。左键单击块
,然后获取他们正在单击的块。在您尝试获取他们正在命中的块之前,即使当他们按下按钮或踩到压盘时,它也会返回一个NullPointerException
,因为没有命中任何块
一般的经验法则是,在从事件中获取某些信息之前,首先检查您获取的信息是否存在。如您的错误所示,如下所示:
Caused by: java.lang.NullPointerException
at me.jrneulight.bedrockbreaker.Main.onPlayerUse(Main.java:54)
您将在第54行的Main
文件中获得一个NullPointer
。这意味着第54行的值是空的。首先,让我从改进onPlayerUse
开头的代码开始。您不必使用org.bukkit.block.block
,只需使用block block=evnt.getClickedBlock()
org.bukkit.inventory.ItemStack也一样,您只需要使用ItemStack
错误是由您的方法在未单击块时尝试单击块,或在未使用块时尝试使用项引起的。以下是您应该使用的代码:
@EventHandler(priority=EventPriority.HIGH)
public void onPlayerUse (PlayerInteractEvent evnt) {
if(evnt.getAction().equals(Action.LEFT_CLICK_BLOCK){//make sure that they are infact hitting a block
if(evt.getItem() == new ItemStack(Material.DIAMOND_HOE)){ //make sure they are using a diamond hoe
Block block = evnt.getClickedBlock();
//ItemStack item = evnt.getItem();
//we don't need the above line any more
Player player = evnt.getPlayer();
World world = block.getWorld();
ItemMeta itemmeta = item.getItemMeta();
}
}
}
因此,对于整个onPlayerUse
方法,您应该使用以下代码:
@EventHandler(priority=EventPriority.HIGH)
public void onPlayerUse (PlayerInteractEvent evnt) {
if(evnt.getAction().equals(Action.LEFT_CLICK_BLOCK)){//make sure that they are infact hitting a block
if(evnt.getItem() == new ItemStack(Material.DIAMOND_HOE)){ //make sure they are using a diamond hoe
if(evnt.getItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Bedrock Breaker")){ //make sure the name of the diamond hoe is "Bedrock Breaker" in DARK_AQUA
Block block = evnt.getClickedBlock();
World world = block.getWorld();
Player player = evnt.getPlayer();
if(block.getType() == Material.BEDROCK){ //make sure the block clicked is bedrock
BlockBreakEvent breakEvent = new BlockBreakEvent(block, player);
Bukkit.getServer().getPluginManager().callEvent(breakEvent);
ItemStack drop = new ItemStack(block.getType());
drop.setAmount(1);
drop.setType(Material.BEDROCK);
block.setType(Material.AIR);
world.dropItemNaturally(block.getLocation(), drop);
player.sendMessage("Bedrock Broken!");
}
}
}
}
}
您需要使用.equals(String)
而不是==String
检查名称。此外,您应该首先检查大多数需求,以减少延迟
你之所以会犯这个错误,是因为你没有确定他们击中了一个方块,所以,在你的代码中,当玩家做任何动作时(踩在压盘上,右击一个项目,击中空气),它称为你的代码。这就是为什么您需要确保他们正在使用操作左键单击块。左键单击块
,然后获取他们正在单击的块。在您尝试获取他们正在命中的块之前,即使当他们按下按钮或踩到压盘时,它也会返回一个NullPointerException
,因为没有命中任何块
一般的经验法则是,在从事件中获取某些信息之前,首先检查您获取的信息是否存在。如您的错误所示,如下所示:
Caused by: java.lang.NullPointerException
at me.jrneulight.bedrockbreaker.Main.onPlayerUse(Main.java:54)
您将在第54行的Main
文件中获得一个NullPointer
。这意味着第54行的值是空的。首先,让我从改进onPlayerUse
开头的代码开始。您不必使用org.bukkit.block.block
,只需使用block block=evnt.getClickedBlock()
org.bukkit.inventory.ItemStack也一样,您只需要使用ItemStack
错误是由您的方法在未单击块时尝试单击块,或在未使用块时尝试使用项引起的。以下是您应该使用的代码:
@EventHandler(priority=EventPriority.HIGH)
public void onPlayerUse (PlayerInteractEvent evnt) {
if(evnt.getAction().equals(Action.LEFT_CLICK_BLOCK){//make sure that they are infact hitting a block
if(evt.getItem() == new ItemStack(Material.DIAMOND_HOE)){ //make sure they are using a diamond hoe
Block block = evnt.getClickedBlock();
//ItemStack item = evnt.getItem();
//we don't need the above line any more
Player player = evnt.getPlayer();
World world = block.getWorld();
ItemMeta itemmeta = item.getItemMeta();
}
}
}
因此,对于整个onPlayerUse
方法,您应该使用以下代码:
@EventHandler(priority=EventPriority.HIGH)
public void onPlayerUse (PlayerInteractEvent evnt) {
if(evnt.getAction().equals(Action.LEFT_CLICK_BLOCK)){//make sure that they are infact hitting a block
if(evnt.getItem() == new ItemStack(Material.DIAMOND_HOE)){ //make sure they are using a diamond hoe
if(evnt.getItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Bedrock Breaker")){ //make sure the name of the diamond hoe is "Bedrock Breaker" in DARK_AQUA
Block block = evnt.getClickedBlock();
World world = block.getWorld();
Player player = evnt.getPlayer();
if(block.getType() == Material.BEDROCK){ //make sure the block clicked is bedrock
BlockBreakEvent breakEvent = new BlockBreakEvent(block, player);
Bukkit.getServer().getPluginManager().callEvent(breakEvent);
ItemStack drop = new ItemStack(block.getType());
drop.setAmount(1);
drop.setType(Material.BEDROCK);
block.setType(Material.AIR);
world.dropItemNaturally(block.getLocation(), drop);
player.sendMessage("Bedrock Broken!");
}
}
}
}
}
您需要使用.equals(String)
而不是==String
检查名称。此外,您应该首先检查大多数需求,以减少延迟
你之所以会犯这个错误,是因为你没有确定他们击中了一个方块,所以,在你的代码中,当玩家做任何动作时(踩在压盘上,右击一个项目,击中空气),它称为你的代码。这就是为什么您需要确保他们正在使用操作左键单击块。左键单击块
,然后获取他们正在单击的块。在您尝试获取他们正在命中的块之前,即使当他们按下按钮或踩到压盘时,它也会返回一个NullPointerException
,因为没有命中任何块
一般的经验法则是,在从事件中获取某些信息之前,首先检查您获取的信息是否存在。如您的错误所示,如下所示:
Caused by: java.lang.NullPointerException
at me.jrneulight.bedrockbreaker.Main.onPlayerUse(Main.java:54)
您将在第54行的Main
文件中获得一个NullPointer
。这意味着第54行的值是空的。首先,让我先在onPlayerUse
bette的开头编写代码