diff --git a/src/main/java/pw/yumc/YumCore/kit/StrKit.java b/src/main/java/pw/yumc/YumCore/kit/StrKit.java
index 764e517..c261bd4 100644
--- a/src/main/java/pw/yumc/YumCore/kit/StrKit.java
+++ b/src/main/java/pw/yumc/YumCore/kit/StrKit.java
@@ -2,11 +2,14 @@ package pw.yumc.YumCore.kit;
 
 /**
  * 字符串工具类
- * 
+ *
  * @author 喵♂呜
  * @since 2016年9月14日 上午1:02:23
  */
 public class StrKit {
+    private StrKit() {
+    }
+
     /**
      * 转移数组后获取字符串
      *
diff --git a/src/main/java/pw/yumc/YumCore/misc/L10N.java b/src/main/java/pw/yumc/YumCore/misc/L10N.java
index 8221166..7a739ee 100644
--- a/src/main/java/pw/yumc/YumCore/misc/L10N.java
+++ b/src/main/java/pw/yumc/YumCore/misc/L10N.java
@@ -28,6 +28,9 @@ public class L10N {
         load();
     }
 
+    private L10N() {
+    }
+
     /**
      * 获取物品完整汉化名称(包括原版)
      *
diff --git a/src/main/java/pw/yumc/YumCore/sql/core/KeyValue.java b/src/main/java/pw/yumc/YumCore/sql/core/KeyValue.java
index 02f382a..e0579a3 100644
--- a/src/main/java/pw/yumc/YumCore/sql/core/KeyValue.java
+++ b/src/main/java/pw/yumc/YumCore/sql/core/KeyValue.java
@@ -3,6 +3,7 @@ package pw.yumc.YumCore.sql.core;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Map.Entry;
 
 /**
@@ -13,7 +14,7 @@ import java.util.Map.Entry;
  */
 public class KeyValue {
 
-    private final HashMap<Object, Object> keyvalues = new HashMap<Object, Object>();
+    private final Map<Object, Object> keyvalues = new HashMap<>();
 
     /**
      * 数据库键值管理类
@@ -74,7 +75,7 @@ public class KeyValue {
      * @return 所有的值
      */
     public Object[] getValues() {
-        final List<Object> keys = new ArrayList<Object>();
+        final List<Object> keys = new ArrayList<>();
         for (final Entry<Object, Object> next : this.keyvalues.entrySet()) {
             keys.add(next.getValue());
         }
diff --git a/src/main/java/pw/yumc/YumCore/statistic/Statistics.java b/src/main/java/pw/yumc/YumCore/statistic/Statistics.java
index 93c0ae7..0ba4297 100644
--- a/src/main/java/pw/yumc/YumCore/statistic/Statistics.java
+++ b/src/main/java/pw/yumc/YumCore/statistic/Statistics.java
@@ -295,7 +295,7 @@ public class Statistics {
             final long startTime = System.nanoTime();
             final long timeSpent = (startTime - lastPoll) / 1000;
             if (history.size() > 10) {
-                history.remove();
+                history.removeFirst();
             }
             final double ttps = 2.0E7D / (timeSpent == 0 ? 1 : timeSpent);
             if (ttps <= 21.0D) {