Solved Any way to make sure player is not teleported into water?

I have this code:

Code:Java

 
for (Player op : Bukkit.getOnlinePlayers()) {
    if (op.getName().equalsIgnoreCase(args[0])) {
        Random r = new Random();
        int x = r.nextInt(2500);
        int z = r.nextInt(2500);
        int y = op.getWorld().getHighestBlockYAt(x,z);
        Location oldloc = op.getLocation();
        Location loc = new Location(op.getWorld(),x,y+0.5,z);
        op.teleport(loc);
        sender.sendMessage(plugin.Color("&aYou teleported "+op.getName()+" to a random location."));
        op.sendMessage(plugin.Color("&bYou've been teleported to location "+loc.getBlockX()+" "+loc.getBlockY()+" "+loc.getBlockZ()+" from "+oldloc.getBlockX()+" "+oldloc.getBlockY()+" "+oldloc.getBlockZ()+"."));
        return true;
    } else {
        sender.sendMessage(plugin.Color("&cA player with the name "+args[0]+" was not found. :("));
        return true;
    }
}
 

And it works but is there any way to check if the player is gonna be teleported into water and if the player is gonna be teleported into water is there any way to search for a new location?

 

@timtower Thanks for the information, i'll try to look it up. And thanks for the reminder about lava.
EDIT: Works perfectly! Thanks again.