Minecraft block despavnen?

I'm trying 1 hr. A way to write a block that disappears after 5 seconds, but none works. Can someone please pre-code this for me.

@EventHandler

public void onPlace (BlockPlaceEvents) {

new BukkitRunnable () {

@Override

public void run () {

e.getBlock () setType (Material.AIR).

}

} .runTaskLater (Main.plugin, 100);