diff --git a/src/main/java/com/sunyard/sge/database/SydApiSM4.java b/src/main/java/com/sunyard/sge/database/SydApiSM4.java
index fedc62d..c5bfca1 100644
--- a/src/main/java/com/sunyard/sge/database/SydApiSM4.java
+++ b/src/main/java/com/sunyard/sge/database/SydApiSM4.java
@@ -12,7 +12,7 @@ public class SydApiSM4 {
     private int iPkgNum = 1;
     private int iFlag;
     private boolean is_finished = false;
-    ByteBuffer sourceWrap = ByteBuffer.wrap(new byte[0]);
+    private ByteBuffer sourceWrap = ByteBuffer.wrap(new byte[0]);
 
 
     public SydApiSM4(SydApi api, int iKeyIndex, int endeFlag) {
@@ -21,77 +21,87 @@ public class SydApiSM4 {
         this.iKeyIndex = iKeyIndex;
     }
 
-    public void update(byte[] pcData) {
-        this.pcdataResult = pcData;
-        if (null == pcData || pcData.length == 0) {
-            return;
-        }
-        int plength = pcData.length;
-        if (is_finished) {
-            throw new SydApiException(0);
-        }
-        if (plength > 4064) {
-            throw new SydApiException(0);
-        }
-        if (0 == sourceWrap.array().length) {
-            //加密
-            if (plength < 16) {
-                api.SYD_SM4_LongData(iKeyIndex, new byte[0], iPkgNum, iFlag);
-                if (iFlag == 0 && 1 == iPkgNum) {
-                    throw new SydApiException("解密的首包不能小于 16 字节", 0);
+    public byte[] update(byte[] pcData) {
+        try {
+            this.pcdataResult = pcData;
+            if (null == pcData || pcData.length == 0) {
+                return new byte[0];
+            }
+            int plength = pcData.length;
+            if (is_finished) {
+                throw new SydApiException(0);
+            }
+            if (plength > 4064) {
+                throw new SydApiException(0);
+            }
+            if (0 == sourceWrap.array().length) {
+                //加密
+                if (plength < 16) {
+                    api.SYD_SM4_LongData(iKeyIndex, new byte[0], iPkgNum, iFlag);
+                    if (iFlag == 0 && 1 == iPkgNum) {
+                        throw new SydApiException("解密的首包不能小于 16 字节", 0);
+                    }
+                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
+                    bufferResult.put(sourceWrap);
+                    bufferResult.put(pcData);
+                    sourceWrap = bufferResult;
+                }
+                if (plength % 16 != 0) {
+                    ByteBuffer buffer = ByteBuffer.wrap(pcData);
+                    int remainder = plength % 16;
+                    int intercept = plength - remainder;
+                    byte[] bytes = new byte[intercept];
+                    ByteBuffer byteBuffer = buffer.get(bytes, 0, intercept);
+                    byte[] bytes1 = new byte[remainder];
+                    byteBuffer.get(bytes1);
+                    this.pcdataResult = bytes;
+                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + remainder);
+                    bufferResult.put(bytes1);
+                    sourceWrap = bufferResult;
                 }
-                ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
-                bufferResult.put(sourceWrap);
-                bufferResult.put(pcData);
-                sourceWrap = bufferResult;
-            }
-            if (plength % 16 != 0) {
-                ByteBuffer buffer = ByteBuffer.wrap(pcData);
-                int remainder = plength % 16;
-                int intercept = plength - remainder;
-                byte[] bytes = new byte[intercept];
-                ByteBuffer byteBuffer = buffer.get(bytes, 0, intercept);
-                byte[] bytes1 = new byte[remainder];
-                byteBuffer.get(bytes1);
-                this.pcdataResult = bytes;
-                ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + remainder);
-                bufferResult.put(bytes1);
-                sourceWrap = bufferResult;
-            }
-            byte[] bytes = api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
-            iPkgNum = 2;
-        } else {
-            if (16 > pcData.length + sourceWrap.array().length) {
-                ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
-                bufferResult.put(sourceWrap);
-                bufferResult.put(pcData);
-                sourceWrap = bufferResult;
-            } else if ((pcData.length + sourceWrap.array().length) % 16 == 0) {
-                ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
-                bufferResult.put(sourceWrap);
-                bufferResult.put(pcData);
-                byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
-                api.SYD_SM4_LongData(iKeyIndex, bytes, iPkgNum, iFlag);
-            } else {
-                ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
-                bufferResult.put(sourceWrap);
-                bufferResult.put(pcData);
-                byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
-                ByteBuffer buffer = ByteBuffer.wrap(bytes);
-                int remainder = bytes.length % 16;
-                int intercept = bytes.length - remainder;
-                byte[] pcdataByte = new byte[intercept];
-                ByteBuffer byteBuffer = buffer.get(pcdataByte, 0, intercept);
-                byte[] bytes1 = new byte[remainder];
-                byteBuffer.get(bytes1);
-                this.pcdataResult = pcdataByte;
-                ByteBuffer bufferResults = ByteBuffer.allocate(remainder);
-                bufferResults.put(bytes1);
-                sourceWrap = bufferResults;
-                api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
                 iPkgNum = 2;
+                return api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
+
+            } else {
+                if (16 > pcData.length + sourceWrap.array().length) {
+                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
+                    bufferResult.put(sourceWrap);
+                    bufferResult.put(pcData);
+                    sourceWrap = bufferResult;
+                } else if ((pcData.length + sourceWrap.array().length) % 16 == 0) {
+                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
+                    bufferResult.put(sourceWrap);
+                    bufferResult.put(pcData);
+                    byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
+                    return api.SYD_SM4_LongData(iKeyIndex, bytes, iPkgNum, iFlag);
+                } else {
+                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
+                    bufferResult.put(sourceWrap);
+                    bufferResult.put(pcData);
+                    byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
+                    ByteBuffer buffer = ByteBuffer.wrap(bytes);
+                    int remainder = bytes.length % 16;
+                    int intercept = bytes.length - remainder;
+                    byte[] pcdataByte = new byte[intercept];
+                    ByteBuffer byteBuffer = buffer.get(pcdataByte, 0, intercept);
+                    byte[] bytes1 = new byte[remainder];
+                    byteBuffer.get(bytes1);
+                    this.pcdataResult = pcdataByte;
+                    ByteBuffer bufferResults = ByteBuffer.allocate(remainder);
+                    bufferResults.put(bytes1);
+                    sourceWrap = bufferResults;
+                    iPkgNum = 2;
+                    return api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
+
+                }
             }
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw e;
         }
+
+        return null;
+
     }
 
     public byte[] finish() {
diff --git a/src/main/java/com/sunyard/sge/database/SydSM4Mac.java b/src/main/java/com/sunyard/sge/database/SydSM4Mac.java
index 342a309..9dbc80b 100644
--- a/src/main/java/com/sunyard/sge/database/SydSM4Mac.java
+++ b/src/main/java/com/sunyard/sge/database/SydSM4Mac.java
@@ -3,25 +3,22 @@ package com.sunyard.sge.database;
 import com.sunyard.SydApiException;
 
 import java.nio.ByteBuffer;
-import java.nio.charset.StandardCharsets;
-import java.security.MessageDigest;
 
 public class SydSM4Mac {
     private SydApi api;
-    private byte[] last_in_data;
     private int iKeyIndex;
     private int iPkgNum = 1;
+    private boolean isFinished;
+
+    // 中间数据
     private String pcProcData;
-    private boolean is_finished;
-    private String pcMac;
-    private byte[] pcdataResult = new byte[0];
-    ByteBuffer sourceWrap = ByteBuffer.wrap(new byte[0]);
+
+
+    private ByteBuffer sourceWrap = ByteBuffer.wrap(new byte[0]);
 
     public SydSM4Mac(SydApi api, int iKeyIndex) {
         this.api = api;
         this.iKeyIndex = iKeyIndex;
-        this.pcProcData = pcProcData;
-        this.pcMac=pcMac;
     }
 
     public SydSM4Mac(SydApi api) {
@@ -29,90 +26,47 @@ public class SydSM4Mac {
     }
 
     public SydSM4Mac update(byte[] pcData) {
-        if (null == pcData || 0 == pcData.length) {
-            return this;
-        }
-        int length = pcData.length;
-        this.pcdataResult = pcData;
-        if (is_finished) {
-            throw new SydApiException(0);
-        }
-        if (length > 4064) {
-            throw new SydApiException(0);
-        }
-        if (0 == sourceWrap.array().length) {
-            if (length < 16) {
-                ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + length);
-                bufferResult.put(sourceWrap);
-                bufferResult.put(pcData);
-                sourceWrap = bufferResult;
-                if (null == this.pcMac || "".equals(this.pcMac)) {
-                    LongDataReturn<String, String> stringStringLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, pcdataResult, 0, pcProcData);
-                    pcProcData = stringStringLongDataReturn.getProcData();
-                } else {
-                    LongDataReturn<String, Boolean> stringBooleanLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, pcdataResult, 0, pcProcData, pcMac);
-                    pcProcData = stringBooleanLongDataReturn.getProcData();
-                    return this;
+
+        try {
+            if (null == pcData || 0 == pcData.length) {
+                return this;
+            }
+            int length = pcData.length;
+            this.pcdataResult = pcData;
+            if (isFinished) {
+                throw new SydApiException(0);
+            }
+            if (length > 4064) {
+                throw new SydApiException(0);
+            }
+            if (0 == sourceWrap.array().length) {
+                if (length < 16) {
+                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + length);
+                    bufferResult.put(sourceWrap);
+                    bufferResult.put(pcData);
+                    sourceWrap = bufferResult;
+                    if (null == this.pcMac || "".equals(this.pcMac)) {
+                        LongDataReturn<String, String> stringStringLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, pcdataResult, 0, pcProcData);
+                        pcProcData = stringStringLongDataReturn.getProcData();
+                    } else {
+                        LongDataReturn<String, Boolean> stringBooleanLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, pcdataResult, 0, pcProcData, pcMac);
+                        pcProcData = stringBooleanLongDataReturn.getProcData();
+                        return this;
+                    }
                 }
-            }
-            if (length % 16 != 0) {
-                ByteBuffer buffer = ByteBuffer.wrap(pcData);
-                int remainder = length % 16;
-                int intercept = length - remainder;
-                byte[] bytes = new byte[intercept];
-                ByteBuffer byteBuffer = buffer.get(bytes, 0, intercept);
-                byte[] bytes1 = new byte[remainder];
-                byteBuffer.get(bytes1);
-                this.pcdataResult = bytes;
-                ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + remainder);
-                bufferResult.put(bytes1);
-                sourceWrap = bufferResult;
-            }
-            if (null == this.pcMac || "".equals(this.pcMac)) {
-                LongDataReturn<String, String> stringStringLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, pcdataResult, iPkgNum, pcProcData);
-                pcProcData = stringStringLongDataReturn.getProcData();
-                iPkgNum = 2;
-            } else {
-                LongDataReturn<String, Boolean> stringBooleanLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, pcdataResult, iPkgNum, pcProcData, pcMac);
-                pcProcData = stringBooleanLongDataReturn.getProcData();
-                iPkgNum = 2;
-            }
-        } else {
-            if (16 > pcData.length + sourceWrap.array().length) {
-                ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + length);
-                bufferResult.put(sourceWrap);
-                bufferResult.put(pcData);
-                sourceWrap = bufferResult;
-            } else if ((pcData.length + sourceWrap.array().length) % 16 == 0) {
-                ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + length);
-                bufferResult.put(sourceWrap);
-                bufferResult.put(pcData);
-                byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
-                if (null == this.pcMac || "".equals(this.pcMac)) {
-                    LongDataReturn<String, String> stringStringLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, bytes, iPkgNum, pcProcData);
-                    pcProcData = stringStringLongDataReturn.getProcData();
-                    iPkgNum = 2;
-                } else {
-                    LongDataReturn<String, Boolean> stringBooleanLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, bytes, iPkgNum, pcProcData, pcMac);
-                    pcProcData = stringBooleanLongDataReturn.getProcData();
-                    iPkgNum = 2;
+                if (length % 16 != 0) {
+                    ByteBuffer buffer = ByteBuffer.wrap(pcData);
+                    int remainder = length % 16;
+                    int intercept = length - remainder;
+                    byte[] bytes = new byte[intercept];
+                    ByteBuffer byteBuffer = buffer.get(bytes, 0, intercept);
+                    byte[] bytes1 = new byte[remainder];
+                    byteBuffer.get(bytes1);
+                    this.pcdataResult = bytes;
+                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + remainder);
+                    bufferResult.put(bytes1);
+                    sourceWrap = bufferResult;
                 }
-            } else {
-                ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + length);
-                bufferResult.put(sourceWrap);
-                bufferResult.put(pcData);
-                byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
-                ByteBuffer buffer = ByteBuffer.wrap(bytes);
-                int remainder = bytes.length % 16;
-                int intercept = bytes.length - remainder;
-                byte[] pcdataByte = new byte[intercept];
-                ByteBuffer byteBuffer = buffer.get(pcdataByte, 0, intercept);
-                byte[] bytes1 = new byte[remainder];
-                byteBuffer.get(bytes1);
-                this.pcdataResult = pcdataByte;
-                ByteBuffer bufferResults = ByteBuffer.allocate(remainder);
-                bufferResults.put(bytes1);
-                sourceWrap = bufferResults;
                 if (null == this.pcMac || "".equals(this.pcMac)) {
                     LongDataReturn<String, String> stringStringLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, pcdataResult, iPkgNum, pcProcData);
                     pcProcData = stringStringLongDataReturn.getProcData();
@@ -122,18 +76,68 @@ public class SydSM4Mac {
                     pcProcData = stringBooleanLongDataReturn.getProcData();
                     iPkgNum = 2;
                 }
+            } else {
+                if (16 > pcData.length + sourceWrap.array().length) {
+                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + length);
+                    bufferResult.put(sourceWrap);
+                    bufferResult.put(pcData);
+                    sourceWrap = bufferResult;
+                } else if ((pcData.length + sourceWrap.array().length) % 16 == 0) {
+                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + length);
+                    bufferResult.put(sourceWrap);
+                    bufferResult.put(pcData);
+                    byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
+                    if (null == this.pcMac || "".equals(this.pcMac)) {
+                        LongDataReturn<String, String> stringStringLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, bytes, iPkgNum, pcProcData);
+                        pcProcData = stringStringLongDataReturn.getProcData();
+                        iPkgNum = 2;
+                    } else {
+                        LongDataReturn<String, Boolean> stringBooleanLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, bytes, iPkgNum, pcProcData, pcMac);
+                        pcProcData = stringBooleanLongDataReturn.getProcData();
+                        iPkgNum = 2;
+                    }
+                } else {
+                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + length);
+                    bufferResult.put(sourceWrap);
+                    bufferResult.put(pcData);
+                    byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
+                    ByteBuffer buffer = ByteBuffer.wrap(bytes);
+                    int remainder = bytes.length % 16;
+                    int intercept = bytes.length - remainder;
+                    byte[] pcdataByte = new byte[intercept];
+                    ByteBuffer byteBuffer = buffer.get(pcdataByte, 0, intercept);
+                    byte[] bytes1 = new byte[remainder];
+                    byteBuffer.get(bytes1);
+                    this.pcdataResult = pcdataByte;
+                    ByteBuffer bufferResults = ByteBuffer.allocate(remainder);
+                    bufferResults.put(bytes1);
+                    sourceWrap = bufferResults;
+                    if (null == this.pcMac || "".equals(this.pcMac)) {
+                        LongDataReturn<String, String> stringStringLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, pcdataResult, iPkgNum, pcProcData);
+                        pcProcData = stringStringLongDataReturn.getProcData();
+                        iPkgNum = 2;
+                    } else {
+                        LongDataReturn<String, Boolean> stringBooleanLongDataReturn = api.SYD_SM4Mac_LongData(iKeyIndex, pcdataResult, iPkgNum, pcProcData, pcMac);
+                        pcProcData = stringBooleanLongDataReturn.getProcData();
+                        iPkgNum = 2;
+                    }
+                }
             }
+            return this;
+        }catch ( Exception e ) {
+            e.printStackTrace();
+            throw e;
         }
-        return this;
+
     }
 
 
     public LongDataReturn disget() {
 
-        if (is_finished) {
+        if (isFinished) {
             throw new SydApiException(0);
         }
-        this.is_finished = true;
+        this.isFinished = true;
         if (1 == this.iPkgNum) {
             this.iPkgNum = 0;
         } else if (2 == this.iPkgNum) {
diff --git a/src/test/java/test/LongDataTest.java b/src/test/java/test/LongDataTest.java
index 2458104..f32ea42 100644
--- a/src/test/java/test/LongDataTest.java
+++ b/src/test/java/test/LongDataTest.java
@@ -6,6 +6,7 @@ import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
+import java.nio.ByteBuffer;
 import java.util.Random;
 
 public class LongDataTest {
@@ -13,6 +14,8 @@ public class LongDataTest {
     private SydApi api;
     @Before
     public void init(){
+        System.setProperty("com.sunyard.sydapi4j.debug", "true");
+
         SydApiBuilder builder = new SydApiBuilder(
                 new String[]{ "192.168.0.200" },
                 new int[]{ 8889 },
@@ -24,7 +27,7 @@ public class LongDataTest {
     }
 
     @Test
-    public void case1(){
+    public void sm3_case1(){
         SydApiSM3 sm3 = api.initSM3();
         sm3.update(null);
         String mac = sm3.digest();
@@ -32,30 +35,49 @@ public class LongDataTest {
     }
 
     @Test
-    public void case2(){
+    public void sm3_case2(){
         SydApiSM3 sm3 = api.initSM3();
+        sm3.update(Util.hexString2Bytes("1234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678"));
+        String mac = sm3.digest();
+        Assert.assertEquals("9431C865C84B02C8A7C503F53A6D6C3C66704F8F713D124610314E31B19937F7", mac);
+    }
 
-        for (int i =0 ; i < 1000; i ++) {
+    @Test
+    public void sm3_case3(){
+        SydApiSM3 sm3 = api.initSM3();
+        sm3.update(Util.hexString2Bytes("1234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678"));
+        sm3.update(Util.hexString2Bytes("1234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678"));
+        String mac = sm3.digest();
+        Assert.assertEquals("2A217F11AD8D113EDCFED070A217DB9328FD00BFF31BA0843E04375C9F0C5B6A", mac);
+    }
+
+    @Test
+    public void sm3_case4(){
+        SydApiSM3 sm3 = api.initSM3();
+        System.out.print( "org=");
+        for (int i =0 ; i < 100; i ++) {
             int lucky = new Random().nextInt(4065);
             byte[] data = new byte[lucky];
             new Random().nextBytes( data );
+            System.out.print( Util.bytes2HexString(data) );
             sm3.update(data);
         }
 
         String mac = sm3.digest();
+        System.out.println();
         System.out.println( mac );
     }
 
 
     @Test
-    public void case3(){
+    public void sm3_case5(){
         SydApiSM3 sm3 = api.initSM3();
         String mac = sm3.digest();
         Assert.assertEquals("1AB21D8355CFA17F8E61194831E81A8F22BEC8C728FEFB747ED035EB5082AA2B", mac);
     }
 
     @Test
-    public void case9(){
+    public void sm4mac_case1(){
         SydSM4Mac sydApiMac = api.initSM4Mac(1);
         sydApiMac.update(null);
         String mac = (String) sydApiMac.disget().getData();
@@ -63,17 +85,17 @@ public class LongDataTest {
     }
 
     @Test
-    public void case10(){
+    public void sm4mac_case2(){
         SydSM4Mac sydApiMac = api.initSM4Mac(1);
         String mac = (String) sydApiMac.disget().getData();
         Assert.assertEquals("FF49F76AD3A71651FE1A8A9F0D2A689E", mac);
     }
 
     @Test
-    public void case11(){
+    public void sm4mac_case3(){
         SydSM4Mac sydApiMac = api.initSM4Mac(1);
 
-        for (int i =0 ; i < 1000; i ++) {
+        for (int i =0 ; i < 10; i ++) {
             int lucky = new Random().nextInt(4065);
             byte[] data = new byte[lucky];
             System.out.println("len="+lucky);
@@ -86,6 +108,9 @@ public class LongDataTest {
     }
 
 
+
+
+
     @Test
     public void case5(){
         SydApiSM4 sydApiSM4 = api.initSM4(api, 1,1);
@@ -98,7 +123,7 @@ public class LongDataTest {
     public void case6(){
         SydApiSM4 sydApiSM4 = api.initSM4(api, 1,1);
 
-        for (int i =0 ; i < 1000; i ++) {
+        for (int i =0 ; i < 10; i ++) {
             int lucky = new Random().nextInt(4065);
             byte[] data = new byte[lucky];
             System.out.println("len="+lucky);