diff --git a/src/main/java/cn/citycraft/SimpleProtect/listen/Nightvision.java b/src/main/java/cn/citycraft/SimpleProtect/listen/Nightvision.java
index 11d782e..8242248 100644
--- a/src/main/java/cn/citycraft/SimpleProtect/listen/Nightvision.java
+++ b/src/main/java/cn/citycraft/SimpleProtect/listen/Nightvision.java
@@ -3,7 +3,9 @@ package cn.citycraft.SimpleProtect.listen;
 import java.util.Collection;
 import java.util.Iterator;
 
-import org.bukkit.*;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.World;
 import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
@@ -17,36 +19,36 @@ public class Nightvision implements Listener {
 
 	SimpleProtect plugin;
 
-	public Nightvision(SimpleProtect main) {
+	public Nightvision(final SimpleProtect main) {
 		plugin = main;
 	}
 
 	@EventHandler
-	public void OnBlockBreak(BlockBreakEvent e) {
-		Player p = e.getPlayer();
+	public void OnBlockBreak(final BlockBreakEvent e) {
+		final Player p = e.getPlayer();
 		if (p.hasPermission("sp.ignore.nightvision") || p.isOp()) {
 			return;
 		}
-		int light = p.getLocation().getBlock().getLightLevel();
+		final int light = p.getLocation().getBlock().getLightLevel();
 		if (light > 0) {
 			return;
 		}
-		Block b = e.getBlock();
-		Material blockid = b.getType();
-		Location loc = b.getLocation();
-		World World = loc.getWorld();
-		int x = loc.getBlockX();
-		int y = loc.getBlockY();
-		int z = loc.getBlockZ();
-		Location loc_top = new Location(World, x, y + 1, z);
+		final Block b = e.getBlock();
+		final Material blockid = b.getType();
+		final Location loc = b.getLocation();
+		final World World = loc.getWorld();
+		final int x = loc.getBlockX();
+		final int y = loc.getBlockY();
+		final int z = loc.getBlockZ();
+		final Location loc_top = new Location(World, x, y + 1, z);
 		if (loc_top.getBlock().getType() == Material.AIR) {
 			return;
 		}
-		Collection<PotionEffect> effect = p.getActivePotionEffects();
-		Iterator<PotionEffect> iterator = effect.iterator();
+		final Collection<PotionEffect> effect = p.getActivePotionEffects();
+		final Iterator<PotionEffect> iterator = effect.iterator();
 		Boolean flag = Boolean.valueOf(false);
 		while (iterator.hasNext()) {
-			PotionEffect element = (PotionEffect) iterator.next();
+			final PotionEffect element = iterator.next();
 			if (element.toString().toUpperCase().contains("NIGHT_VISION")) {
 				flag = Boolean.valueOf(true);
 				break;
@@ -56,13 +58,8 @@ public class Nightvision implements Listener {
 			if (blockid == Material.AIR) {
 				return;
 			}
-			if (blockid == Material.STONE || blockid == Material.GOLD_ORE
-					|| blockid == Material.IRON_ORE
-					|| blockid == Material.COAL_ORE
-					|| blockid == Material.DIAMOND_ORE
-					|| blockid == Material.REDSTONE_ORE
-					|| blockid == Material.LAPIS_ORE
-					|| blockid == Material.EMERALD_ORE) {
+			if (blockid == Material.STONE || blockid == Material.GOLD_ORE || blockid == Material.IRON_ORE || blockid == Material.COAL_ORE || blockid == Material.DIAMOND_ORE
+					|| blockid == Material.REDSTONE_ORE || blockid == Material.LAPIS_ORE || blockid == Material.EMERALD_ORE) {
 				e.setCancelled(true);
 				p.sendMessage(plugin.getfullmsg("Nightvision.Tip"));
 			}