diff --git a/maker/java/src/main/java/org/lionsoul/ip2region/UtilTest.java b/maker/java/src/main/java/org/lionsoul/ip2region/UtilTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..7569b1b16dbe3899bb9d8c99d47d29052f8d2ef5
--- /dev/null
+++ b/maker/java/src/main/java/org/lionsoul/ip2region/UtilTest.java
@@ -0,0 +1,75 @@
+// Copyright 2022 The Ip2Region Authors. All rights reserved.
+// Use of this source code is governed by a Apache2.0-style
+// license that can be found in the LICENSE file.
+//
+// @Author Lion <chenxin619315@gmail.com>
+// @Date   2022/07/15
+
+package org.lionsoul.ip2region;
+
+import org.lionsoul.ip2region.xdb.IndexPolicy;
+import org.lionsoul.ip2region.xdb.Log;
+import org.lionsoul.ip2region.xdb.Segment;
+import org.lionsoul.ip2region.xdb.Util;
+
+public class UtilTest {
+
+    public static final Log log = Log.getLogger(UtilTest.class);
+
+    public static void testIndexPolicy() {
+        final String[] inputs = {"vector", "btree", "VecTor", "BTree", "abc"};
+        for (String str : inputs) {
+            try {
+                int policy = IndexPolicy.parse(str);
+                log.infof("parse(%s)=%d", str, policy);
+            } catch (Exception e) {
+                log.errorf("parse index policy `%s`: %s", str, e.getMessage());
+            }
+        }
+    }
+
+    public static void testIPUtil() {
+        final String ipStr = "1.2.3.4";
+        try {
+            long ip = Util.checkIP(ipStr);
+            log.infof("checkIP(%s)=%d, validate: %s, long2ip(%d)=%s", ipStr, ip, ip == 16909060 ? "true" : "false", ip, Util.long2ip(ip));
+        } catch (Exception e) {
+            log.errorf("failed to check ip `%s`: %s", ipStr, e.getMessage());
+        }
+    }
+
+    public static void testSegment() {
+        final String[] t_segs = {
+            "1.1.0.0|1.3.3.24|中国|广东|深圳|电信",
+            "0.0.0.0|1.255.225.254|0|0|0|内网IP|内网IP",
+            "28.201.224.0|29.34.191.255|美国|0|0|0|0"
+        };
+
+        for (String str : t_segs) {
+            try {
+                final Segment seg = Segment.parse(str);
+                log.infof("segment(%s)=%s, split: ", str, seg.toString());
+                for (Segment s : seg.split()) {
+                    log.debugf(s.toString());
+                }
+            } catch (Exception e) {
+                log.errorf("failed to parse segment `%s`: %s", str, e.getMessage());
+            }
+        }
+    }
+
+    public static void main(String[] args) {
+        System.out.println("+-- testing index policy");
+        testIndexPolicy();
+        System.out.println();
+
+        System.out.println("+-- testing ip util");
+        testIPUtil();
+        System.out.println();
+
+        System.out.println("+-- testing segments");
+        testSegment();
+        System.out.println();
+    }
+
+}
diff --git a/maker/java/src/main/java/org/lionsoul/ip2region/xdb/Segment.java b/maker/java/src/main/java/org/lionsoul/ip2region/xdb/Segment.java
index 43fdf506f2be8d17594b190d5f631578463eab89..61a350b93dbe89d53caeb499038e37c256c2dc70 100644
--- a/maker/java/src/main/java/org/lionsoul/ip2region/xdb/Segment.java
+++ b/maker/java/src/main/java/org/lionsoul/ip2region/xdb/Segment.java
@@ -72,7 +72,7 @@ public class Segment {
                     eip = seg.endIP;
                 }
 
-                segList.add(new Segment(sip, eip, seg.region));
+                segList.add(new Segment(sip, eip, region));
             }
         }