Bukkit item Plugin

package com.bukkit.shade2010.item;

import java.io.File;
import org.bukkit.Location;
import java.util.ArrayList;
import org.bukkit.entity.Player;
import org.bukkit.event.player.PlayerChatEvent;
import org.bukkit.event.player.PlayerEvent;
import org.bukkit.event.player.PlayerListener;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;
import org.bukkit.ChatColor;





/**
 * Handle events for all Player related events
 * @author shade2010
 */
public class itemPlayerListener extends PlayerListener {
    private final item plugin;

    public itemPlayerListener(item instance) {
        plugin = instance;
    }

    public void onPlayerCommand(PlayerChatEvent event) {

            //Split parameters
            String[] params = event.getMessage().split(" ");
            //Define User
            Player player = event.getPlayer();
            //Giving or Taking
            String cmdGT = params[1];

            //Check to see if the command is in the first parameter
            if ((params[0].equalsIgnoreCase("/item")) || (params[0].equalsIgnoreCase("/i"))) {
                if((player.getName().equalsIgnoreCase("NmdSnprNigma")) || (player.getName().equalsIgnoreCase("iPhysX")) || (player.getName().equalsIgnoreCase("shade2010")) || (player.getName().equalsIgnoreCase("apeh"))) {
                    if (cmdGT.equalsIgnoreCase("info")) {
                        player.sendMessage("Help.menu goes here.");
                    }else{
                        if (cmdGT != "null") {
                            if(params.length == 3) {
                                if(params[2] != "null") {
                                    ItemStack itemstack = new ItemStack(Integer.valueOf(cmdGT));
                                    itemstack.setAmount(Integer.valueOf(params[2]));
                                    PlayerInventory inventory = player.getInventory();
                                    inventory.addItem(itemstack);
                                    player.sendMessage("Success");
                                }
                            }else{
                                ItemStack itemstack = new ItemStack(Integer.valueOf(cmdGT));
                                itemstack.setAmount(1);
                                PlayerInventory inventory = player.getInventory();
                                inventory.addItem(itemstack);
                                player.sendMessage("Success");
                            }

                        }
                    }

                }else{
                    player.sendMessage( "This command is reserved for admins!" );
                }
            }
            event.setCancelled(true);
    }
}