McdLib.java

//Name this file McdLib
import java.util.ArrayList;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;

public class McdLib {
    public static boolean isHidden = false;
    /*
        public void onJoin(PlayerJoinEvent e){
        Player p = (Player)e.getPlayer();
        McdLib.showPlayers(p);
        }
     */

    public static void showPlayers(Player pl){
        for(Player p : Bukkit.getOnlinePlayers()){
            pl.showPlayer(p);
        }
        resetDye(pl);
    }
    /*
        public void onClick(PlayerInteractEvent e){
            Player p = (Player)e.getPlayer();
        if(e.getAction() == Action.RIGHT_CLICK_BLOCK || e.getAction() == Action.RIGHT_CLICK_AIR){
        if(McdLib.isHidden == false){
        McdLib.hidePlayers(p);
        McdLib.isHidden = true;
        }else{
        McdLib.showPlayers(p);
        McdLib.isHidden = false;
        }
     */

    public static void hidePlayers(Player pl){
        for(Player p: Bukkit.getOnlinePlayers()){
            pl.hidePlayer(p);
        }
        handleDye(pl);
        changeDyeHidden(pl);
    }
    public static void handleDye(Player p){
        p.getInventory().remove(Material.INK_SACK);
    }
    public static void resetDye(Player p){
        //Change Dye Color to Green.
        ArrayList<String> lr = new ArrayList<String>();
        ItemStack gDye = new ItemStack(Material.INK_SACK,1,(short)10);
        ItemMeta gDyeM = gDye.getItemMeta();
        lr.add(ChatColor.GRAY+"Enable and Disable Player Visibility.");
        gDyeM.setLore(lr);
        gDyeM.setDisplayName(ChatColor.GREEN+"Players -> Enabled");
        gDye.setItemMeta(gDyeM);
        p.getInventory().addItem(gDye);
    }
    public static void changeDyeHidden(Player p){
        //Change Dye Color to Gray.
        ArrayList<String> lr = new ArrayList<String>();
        ItemStack gDye = new ItemStack(Material.INK_SACK,1,(short)8);
        ItemMeta gDyeM = gDye.getItemMeta();
        lr.add(ChatColor.GRAY+"Enable and Disable Player Visibility.");
        gDyeM.setLore(lr);
        gDyeM.setDisplayName(ChatColor.GREEN+"Players -> "+ChatColor.RED+"DISABLED");
        gDye.setItemMeta(gDyeM);
        p.getInventory().addItem(gDye);
    }
}