How to switch a lever?

PHP:

plugin.getServer().getScheduler().scheduleSyncDelayedTask(plugin, new Runnable(){
                    public void run(){
                            byte data = lever.getData();
                            if((data & 0x8) != 8){
                              data |= 8;
                            }
                            else
                            if((data & 0x8) == 8){
                              data ^= 8;
                            }
                            lever.setData((byte)data);
                    }
                }, 0L);

That code doesn't seem to work, and i'm 100% sure it is a lever block.

 

What does |= do? Is that divide?

 

Its an Bitwise operator meaning 'OR'

OnTopic: i cant be much of help, as i'm terrible with bitwise operators. They never seem to work right with me...

 

I've never played around with bytes, thanks

 

If you simply want to toggle it (change the state no matter if it's on or not), you don't need that much code.
An exclusive OR (^) on the correct bit would be enough.

Code:

data = data ^ 0x8;

However, I rather think the problem is that setData() doesn't update the state.
I read through a thread about that not long ago (don't have a link right now). I think you have to use another method to make the change take effect and also update its redstone functionality.

EDIT: And why do you use the Scheduler if there's no delay btw?