diff --git a/TurboPFor-Integer-Compression/java/jicbench.java b/TurboPFor-Integer-Compression/java/jicbench.java
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+/**
+    Copyright (C) powturbo 2013-2023
+    GPL v2 License
+  
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+    - homepage : https://sites.google.com/site/powturbo/
+    - github   : https://github.com/powturbo
+    - twitter  : https://twitter.com/powturbo
+    - email    : powturbo [_AT_] gmail [_DOT_] com
+**/
+//     icbench - "Integer Compression" Java Critical Native Interface
+
+/* Usage: (make java/jicbench)
+1 - generate header jic.h 
+$ cd TurboPFor/java
+$ javah -jni jic
+$ cp jic.h ..
+
+2 - Compile jic and jicbench
+$ javac jic.java
+$ javac jicbench.java
+
+3 - compile & link a shared library
+$ cd ..
+$ gcc -O3 -w -march=native -fstrict-aliasing -m64 -shared -fPIC -I/usr/lib/jvm/default-java/include -I/usr/lib/jvm/default-java/include/linux bitpack.c bitunpack.c vp4c.c vp4d.c vsimple.c vint.c bitutil.c jic.c -o libic.so
+$ Search "/usr/lib/" for the file "jni.h" and replace the JDK name "default-java" if necessary (example by "java-8-openjdk-amd64").  
+
+4 - copy "libic.so" to java library directory
+
+5 - start jicbench
+$java jicbench
+*/
+
+class jicbench {
+  // Note: this is a simple interface test not a real benchmark 
+
+  public static void main(String args[]) {
+    int bnum = 12500;
+
+    jic ic = new jic();
+    final  int[]  in = new  int[bnum];
+    final byte[] out = new byte[bnum*4];
+    // final byte[] out = new byte[bnum*4*5/3+1024];
+    final  int[] cpy = new  int[bnum];
+
+    for (int i = 0; i < bnum; ++i) {
+      in[i] = i;
+      cpy[i] = 0;
+    }
+
+
+    long t0 = System.currentTimeMillis();
+    ic.p4nenc32(in, bnum, out);
+    long t = System.currentTimeMillis() - t0;    
+    System.out.println("encode time'" + t + "'");
+
+
+    t0 = System.currentTimeMillis();
+    ic.p4ndec32(out, bnum, cpy);
+    t = System.currentTimeMillis() - t0;
+    System.out.println("decode time'" + t + "'");
+
+    for (int i = 0; i < bnum; ++i) {
+      if(in[i] != cpy[i]) {
+        System.err.println("Error at'" + i + "'");
+        System.exit(1);
+      }
+    }
+    System.out.println("check pass");
+  }
+}