Minecraft Bukkit:如何从主类访问另一个类中的属性/方法?

大家好,我正在尝试将Main类中的变量用于Event Listener类。这是我正在使用的Minecraft Java Bukkit代码。我正在尝试从MainClass接收“CanRestart”静态布尔变量,并尝试在Event Listeners类中使用它。程序中没有弹出错误,但控制台中有错误,插件无法工作。

我知道问题是Event Listeners类中的这行代码(我创建该类是为了尝试从Main类中获取变量):

MainProgram MainCode = new MainProgram();

我对Java的OOP没有太多的知识,但我真的想知道是否可以得到帮助。

我想得到这样一个代码:

MainProgram MainCode = new MainProgram();
if(MainCode.CanRestart == true){
//We received a variable from the main class!
}

这是我的主要课程:

package me.Shadowsych;


import org.bukkit.Bukkit;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class MainProgram extends JavaPlugin{

public static boolean CanRestart = true;
public int CDNumber = 5;
public int DetermineCounter;

    @Override
    public void onEnable(){ //Essential, when your plugin is enabled.
        getLogger().info("Shadowsych's Command Plugin is working!"); //CMD will print this out.
        new EventListeners(this); //Inherits the EventListeners class
    }

    @Override
    public void onDisable(){//Essential, when your plugin is disabled.

    }

    @SuppressWarnings("deprecation")
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) { //Creates command function.

        Player player = (Player) sender;
        if(cmd.getName().equalsIgnoreCase("timer")){ 
            if(CanRestart == true){ //Checks to see if the Timer is still running
            CanRestart = false; //The timer has ran.
            CDNumber = 5;
            DetermineCounter = Bukkit.getServer().getScheduler().scheduleAsyncRepeatingTask(this, new Runnable(){

                public void run(){
                        if(CDNumber > -1){ //This can be a 0 integer
                            if(!(CDNumber == 0)){ //If once it is 0.
                        player.sendMessage("" + CDNumber); //The "" is used to make number a String.
                            }
                        CDNumber --; //Makes the number -1 if it's already a 0.
                    }
                    if(CDNumber == -1){ //Now catches that the number is -1.
                        player.sendMessage("Count down finished");
                        Bukkit.getServer().getScheduler().cancelTask(DetermineCounter); //Disables counter.
                        CanRestart = true; //You can restart your timer now.
                        return;
                    }
                }
            }, 0L, 20L);
            }


        }

        return false; //Is essential in a boolean function.

    }
}

这是我的Event Listener类:

package me.Shadowsych;

import me.Shadowsych.MainProgram;
import org.bukkit.ChatColor;
import org.bukkit.GameMode;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.event.player.PlayerToggleFlightEvent;

public class EventListeners implements Listener {

MainProgram MainCode = new MainProgram();

public EventListeners(MainProgram plugin) {
    plugin.getServer().getPluginManager().registerEvents(this, plugin); //Registers Event Main
}



@EventHandler
public void PlayerToggleFlight(PlayerToggleFlightEvent EventFloat){

    Player player = EventFloat.getPlayer();

    if(player.getGameMode() == GameMode.CREATIVE)
        return; //If the player is creative then don't do this Event.
    EventFloat.setCancelled(true); 
    player.setAllowFlight(false);
    player.setVelocity(player.getLocation().getDirection().multiply(0).setY(1));
    player.sendMessage(ChatColor.AQUA + "You have double jumped!");

}

@EventHandler
public void PlayerJump(PlayerMoveEvent EventJumped){
Player player = EventJumped.getPlayer();

if((player.getGameMode() != GameMode.CREATIVE) //Player is not creative
        && (player.getLocation().subtract(0, 1, 0).getBlock().getType() != Material.AIR) //Block beneath them is not air
        && (!player.isFlying())) //Player is not flying
{

    player.setAllowFlight(true); //Allow the player to fly
}


}
}

下面是控制台的内容:

http://prntscr.com/9ki7a5