java – 使用策略模式的哪种模式可以避免混凝土策略中的重复代码

我对设计模式比较陌生,在下面的例子中,我使用的是我认为的策略模式.但是,我在一些,而不是所有的具体策略中重复自己,并想知道有没有办法避免这种情况？注意ACommand和CCommand在做一些独特的事情之前是如何拥有相同的代码的.

public interface Command 
{
    public boolean execute(CommandSender sender,String[] args);
    public String getName();
    //...
}

public abstract class PlayerCommand implements Command 
{
    protected BukkitPlugin plugin = BukkitPlugin.getInstance();

    private String name;
    //...

    public PlayerCommand(String name) 
    {
        this.name = name;
    }

    public String getName() 
    {
        return this.name;
    }

    //...
}

ACommand

public class ACommand extends PlayerCommand
    {
        public ACommand()
        {
            super("A");
        }

        public boolean execute(CommandSender sender,String[] args)
        {
            Player player = (Player) sender;
            PlayerInventory inventory = player.getInventory();
            ItemStack itemInHand = inventory.getItemInHand();

            if(itemInHand.getType() != Material.COMPASS)
            {
                sender.sendMessage("You must be holding a phone to use this command");
                return true;
            }

            int id = itemInHand.getDurability();

            MobilePhoneManager phoneManager = plugin.getMobilePhoneManager();       
            boolean isMobilePhone = phoneManager.isMobilePhone(id);

            if(!isMobilePhone)
            {
                sender.sendMessage("You must be holding a mobile phone to use this command");
                return true;
            }

            //DO SOMETHING UNIQUE HERE
        }
}

BCommand

public class BCommand extends PlayerCommand
        {
            public BCommand()
            {
                super("B");
            }

            public boolean execute(CommandSender sender,String[] args)
            {
                //SOMETHING ELSE
            }
    }

的CCommand

public class CCommand extends PlayerCommand
    {
        public CCommand()
        {
            super("C");
        }

        public boolean execute(CommandSender sender,String[] args)
        {
            Player player = (Player) sender;
            PlayerInventory inventory = player.getInventory();
            ItemStack itemInHand = inventory.getItemInHand();

            if(itemInHand.getType() != Material.COMPASS)
            {
                sender.sendMessage("You must be holding a phone to use this command");
                return true;
            }

            int id = itemInHand.getDurability();

            MobilePhoneManager phoneManager = plugin.getMobilePhoneManager();       
            boolean isMobilePhone = phoneManager.isMobilePhone(id);

            if(!isMobilePhone)
            {
                sender.sendMessage("You must be holding a mobile phone to use this command");
                return true;
            }

            //DO SOMETHING UNIQUE HERE
        }
}