Bukkit

    @EventHandler
    public void onTrample(PlayerInteractEvent event){
        if (event.isCancelled()) return;

        if (event.getAction() == Action.PHYSICAL){
            //event.setCancelled(true);
            Block block = event.getClickedBlock();
            if(block == null)
                return;
            int blockType = block.getTypeId();

            if(blockType == Material.getMaterial(59).getId() | (blockType == Material.getMaterial(60).getId())){
                event.setUseInteractedBlock(org.bukkit.event.Event.Result.DENY);
                event.setCancelled(true);

                block.setTypeId(blockType);
                block.setData(block.getData());

            }
        }
    }

I was wondering how to prevent the changing of blocks by trampling, and I came across this plugin along with the source code. I looked it over and you had repeated two if's when you could have just put in a simple 'or' operator, this is half the size and does the same thing =P.

In case you're new to java (I am), the '|' key (the shift-backslash key above the enter key) is the or operator, very useful