Block Detection

How would I detect if a player as walked over or jumped over a specific block, redstone block if possible. I'm trying methods like checking the block location and the player location but it just doesn't work.

 

@someguyonthestreet
p.getLocation().add(0,-1,0).getBlock().getType() == Material.REDSTONE_BLOCK

 

@Funergy Why add -1 when you can do .subtract(0, 1, p)

 

@SuchSwegMuchWow Everyone has its own way doing. So why not?

 

@SuchSwegMuchWow Why use addition or subtraction when you can just get a location relative to a block's face?
There are plenty of ways to obtain a Location.

 

@someguyonthestreet

Code:

// Change -1 to -2 for if a player jumps
if(p.getLocation().subtract(0,-1,0).getblock().getType().equals(Materials.REDSTONE_BLOCK)