diff --git a/binding/java/ReadMe.md b/binding/java/ReadMe.md
index bf0d456..2e8ad58 100644
--- a/binding/java/ReadMe.md
+++ b/binding/java/ReadMe.md
@@ -49,7 +49,7 @@ public class SearcherTest {
 
 ### 缓存 `VectorIndex` 索引
 
-我们可以提前从 xdb 文件中加载出来 VectorIndex 数据，然后全局缓存，每次创建 Searcher 对象的时候使用全局的 VectorIndex 缓存可以减少一次固定的 IO 操作，从而加速查询，减少 IO 压力。
+我们可以提前从 `xdb` 文件中加载出来 `VectorIndex` 数据，然后全局缓存，每次创建 Searcher 对象的时候使用全局的 VectorIndex 缓存可以减少一次固定的 IO 操作，从而加速查询，减少 IO 压力。
 ```java
 import org.lionsoul.ip2region.xdb.Searcher;
 import java.io.*;
@@ -94,7 +94,7 @@ public class SearcherTest {
 }
 ```
 
-### 缓存整个 xdb 数据
+### 缓存整个 `xdb` 数据
 
 我们也可以预先加载整个 ip2region.xdb 的数据到内存，然后基于这个数据创建查询对象来实现完全基于文件的查询，类似之前的 memory search。
 ```java
@@ -176,7 +176,7 @@ ip2region>> 1.2.3.4
 ip2region>>
 ```
 
-输入 ip 即可进行查询测试，也可以设置 `cache-policy` 来分别测试 file/vectorIndex/content 三种不同缓存方式的查询效果。
+输入 ip 即可进行查询测试，也可以分别设置 `cache-policy` 为 file/vectorIndex/content 来测试三种不同缓存实现的查询效果。
 
 
 # bench 测试
@@ -197,5 +197,5 @@ options:
 Bench finished, {cachePolicy: vectorIndex, total: 3417955, took: 8s, cost: 2 μs/op}
 ```
 
-可以通过设置 `cache-policy` 参数来分别测试 file/vectorIndex/content 三种不同缓存方式的性能。
+可以通过分别设置 `cache-policy` 为 file/vectorIndex/content 来测试三种不同缓存实现的效果。
 @Note: 注意 bench 使用的 src 文件要是生成对应 xdb 文件相同的源文件。
diff --git a/binding/java/pom.xml b/binding/java/pom.xml
index 60af6df..60b69b5 100644
--- a/binding/java/pom.xml
+++ b/binding/java/pom.xml
@@ -4,7 +4,7 @@
 
     <groupId>org.lionsoul</groupId>
     <artifactId>ip2region</artifactId>
-    <version>2.6.1</version>
+    <version>2.6.2</version>
     <packaging>jar</packaging>
 
     <name>ip2region</name>
diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java b/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java
index 8f3c819..179cb9f 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java
@@ -156,7 +156,7 @@ public class SearchTest {
 
             long sip;
             try {
-                sip = Searcher.checkIpAddr(ps[0]);
+                sip = Searcher.checkIP(ps[0]);
             } catch (Exception e) {
                 System.out.printf("check start ip `%s`: %s\n", ps[0], e);
                 return;
@@ -164,7 +164,7 @@ public class SearchTest {
 
             long eip;
             try {
-                eip = Searcher.checkIpAddr(ps[1]);
+                eip = Searcher.checkIP(ps[1]);
             } catch (Exception e) {
                 System.out.printf("check end ip `%s`: %s\n", ps[1], e);
                 return;
diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/UtilTest.java b/binding/java/src/main/java/org/lionsoul/ip2region/UtilTest.java
index c526ec8..aba7779 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/UtilTest.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/UtilTest.java
@@ -8,15 +8,13 @@ package org.lionsoul.ip2region;
 
 import org.lionsoul.ip2region.xdb.Searcher;
 
-import java.io.IOException;
-
 public class UtilTest {
 
     public static void testIP2Long() {
         String ip = "1.2.3.4";
         long ipAddr = 0;
         try {
-            ipAddr = Searcher.checkIpAddr(ip);
+            ipAddr = Searcher.checkIP(ip);
         } catch (Exception e) {
             System.out.printf("failed to check ip: %s\n", e);
             return;
diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java b/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
index 900942b..869b288 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
@@ -11,7 +11,6 @@ package org.lionsoul.ip2region.xdb;
 
 import java.io.IOException;
 import java.io.RandomAccessFile;
-import java.util.Arrays;
 
 public class Searcher {
     // constant defined copied from the xdb maker
@@ -72,9 +71,9 @@ public class Searcher {
         return ioCount;
     }
 
-    public String searchByStr(String ip) throws Exception {
-        long ipAddr = checkIpAddr(ip);
-        return search(ipAddr);
+    public String searchByStr(String ipStr) throws Exception {
+        long ip = checkIP(ipStr);
+        return search(ip);
     }
 
     public String search(long ip) throws IOException {
@@ -94,7 +93,7 @@ public class Searcher {
             sPtr = getInt(contentBuff, HeaderInfoLength + idx);
             ePtr = getInt(contentBuff, HeaderInfoLength + idx + 4);
         } else {
-            final byte[] buff = new byte[8];
+            final byte[] buff = new byte[VectorIndexSize];
             read(HeaderInfoLength + idx, buff);
             sPtr = getInt(buff, 0);
             ePtr = getInt(buff, 4);
@@ -245,23 +244,23 @@ public class Searcher {
     public static final byte[] shiftIndex = {24, 16, 8, 0};
 
     /* check the specified ip address */
-    public static long checkIpAddr(String ip) throws Exception {
+    public static long checkIP(String ip) throws Exception {
         String[] ps = ip.split("\\.");
         if (ps.length != 4) {
             throw new Exception("invalid ip address `" + ip + "`");
         }
 
-        long ipAddr = 0;
+        long ipDst = 0;
         for (int i = 0; i < ps.length; i++) {
             int val = Integer.parseInt(ps[i]);
             if (val > 255) {
                 throw new Exception("ip part `"+ps[i]+"` should be less then 256");
             }
 
-            ipAddr |= ((long) val << shiftIndex[i]);
+            ipDst |= ((long) val << shiftIndex[i]);
         }
 
-        return ipAddr & 0xFFFFFFFFL;
+        return ipDst & 0xFFFFFFFFL;
     }
 
 }
\ No newline at end of file