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DES (Data Encryption Standard) Cipher Algorithm
This section describes DES (Data Encryption Standard) algorithm - A 16-round Feistel cipher with block size of 64 bits.
2015-11-05, 4086👍, 8💬

💬 2015-11-05 Herong: The Anh, good question. If your key is less than 64 bits, you can pad it with 0 or 1. Or use a hash algorithm to produce 64 bits...

💬 2015-11-04 The Anh: what if my key don't have enough bit?

💬 2015-11-04 Herong: Zaeem, take a look at the source code at Simple Cryptographer - Simple DES/AES Implementation in C#

💬 2015-11-03 zaeem: how to implement on windows form in c#

💬 2015-10-03 Herong: Mihir, what type of algorithm are you looking for?

(More comments ...)

META-INF Files - Digests, Signature and Certificate
This section describes META-INF files in an .apk package file: MANIFEST.MF - manifest file, CERT.SF - signature file and CERT.RSA - the real signature file with certificate.
2015-09-04, 4069👍, 2💬

💬 2015-09-04 Herong: KariK, thanks for sharing your comments.

💬 2015-08-28 KariK: Step 5. CERT.RSA is not the only file type. There can also be CERT.DSA and CERT.EC files.

Java Compilation and Execution Processes
This section provides a quick introduction of Java compilation and execution process.
2016-12-04, 4042👍, 9💬

💬 2016-12-04 ak: Thx

💬 2016-09-22 rodriguesss: thanks

💬 2016-03-05 Shohel: THanks lot

💬 2016-01-05 Rishika: THANK U

💬 2015-11-28 Herong: Naveen, you are welcome! If you have other questions/problems, post them here. We will be happy to help you out. ☺

(More comments ...)

Downloading and Installing Java DB (Derby)
This section describes how to download and install Java DB (Derby database server) 10.11 - free for evaluation.
2016-02-19, 3870👍, 9💬

💬 2016-02-19 Ali: Good App

💬 2016-02-02 kotyba: very nice

💬 2016-02-02 kotyba: thanks

💬 2015-10-30 govind: super

💬 2015-08-29 memo: thanks

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Converting XML in Pretty Print Format
This section provides a tutorial example on how to convert XML documents into pretty print format using XML Tools Plugin in Notepad++.
2016-08-17, 3856👍, 2💬

💬 2016-08-17 z: Subject_Order 1608_ AFTER [NextExecutionDatetimeCO][ListVMsINe xtExecutionCO]

💬 2016-05-03 dfg: <div class="productdetailpopover adminpopover"> <div class="productimage displayinlineblock"> <div class="makecenterout...

MD5 Message Digest Algorithm Overview
This section describes the MD5 algorithm - a 5-step process of padding of '1000...', appending message length, dividing as 512-bit blocks, initializing 4 buffers, and 4-round of hashing each block.
2016-11-21, 3828👍, 6💬

💬 2016-11-21 this is a burner: concise and accurate, thanks

💬 2016-09-26 brijesh gupta: its helpful

💬 2016-06-17 Ampera: Makasih

Downloading and Installing JDK 1.7.0 on Windows
This section provides a tutorial example on how to download and install JDK 1.7.0 (Java SE 7) on a Windows XP system. A simple Java program was entered, compiled, and executed with the new JDK installation.
2017-01-02, 3682👍, 3💬

💬 2017-01-02 sudhanshu: no comments

💬 2016-12-17 tangxy: thk, i just want to learn java

💬 2016-11-22 ankit: THANKS

What Is DER (Distinguished Encoding Rules) Encoding?
This section describes the DER (Distinguished Encoding Rules) - A binary format of encoding a data value of any data types including nested data structures.
2017-03-15, 3645👍, 2💬

💬 2017-03-15 noname: thanks

💬 2016-01-25 Dev: hello

Converting Secret Keys to and from Byte Arrays
This section provides a quick introduction of the SecretKeySpec class and the KeySpec interface. They can be used to convert secret keys into byte arrays to store them in external files.
2015-11-03, 3624👍, 1💬

💬 2015-11-03 cpp: hello

Using openConnection() Method in java.net.URL Class
This section provides a tutorial example on how to use the openConnection() method in the java.net.URL class to perform a GET method on an HTTPS server. Java Secure Socket Extension (JSSE) works quietly behind the java.net.URL class to provide HTTPS support.
2015-08-05, 3620👍, 2💬

💬 2015-08-05 ashkart: doesnt work indeed. Connection type got, connection object got too. But then there is an exception "java.net.ConnectException: C...

💬 2015-08-05 ashkart: sorry, works fine, i forgot i'm behind the proxy...

HttpsClient.java - HTTPS Client Test Program
This section provides a tutorial example on how to write a HTTPS client test program, HttpsClient.java. It sends a simple HTTP request page using the HTTPS protocol.
2015-11-20, 3570👍, 6💬

💬 2015-11-20 Herong: Philip, can you run HttpsHello server with SSL debug turned on? My test programs do have issues with newer build of JDK 1.7 and ...

💬 2015-11-19 Philip: java version "1.7.0_80" Java(TM) SE Runtime Environment (build 1.7.0_80-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11,...

💬 2015-11-19 Herong: Philip, which JDK version are you using?

💬 2015-11-18 Philip: I changed the code, but then reset back to the example. I recreated the jks a few times. The JVM and OS had not changed. It stop...

💬 2015-11-18 Herong: Philip, Was anything changed? Certificates, code, JVM or operating system...

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JDBC Tutorials - Herong's Tutorial Examples
This JDBC tutorial book is a collection of notes and sample codes written by the author while he was learning JDBC technology himself. It can be used as a tutorial guide for beginners. Topics include Java, Database, JDBC, Driver, ODBC, Connection, DataSource, SQL, ResultSet, Metadata, Derby, MySQL, ...
2015-12-15, 3545👍, 9💬

💬 2015-12-15 hassan: nice, can i get it please?

💬 2015-09-20 Alan: Nice

💬 2011-01-21 Herong: Agree. The driver class must be loaded as shown in this tutorial: Loading Driver Class with Class.forName().

💬 2011-01-18 John: For the JDBC tutorials, you must add: Class.forName with newInstance before making connection.

💬 2010-11-28 Raimo H?linen: Hi, Your Tutorial books for Java JDBC is good for beginners. I'm using it and these examples for my classroom, when we start lea...

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A Sample WSDL 2.0 Document
This section describes a sample WSDL 2.0 document, which defines a Web service, helloService, with an operation called Hello.
2016-03-11, 3503👍, 1💬

💬 2015-08-12 Vivek: Hello fighter

deleteRow() - Deleting Rows through ResultSet Objects
This section describes how to delete rows from target tables through ResultSet objects.
2016-07-13, 3493👍, 2💬

💬 2016-07-13 rahul krishna: good work

Java Tools Tutorials - Herong's Tutorial Notes
This free book is an excellent tutorial book for beginners. It is a collection of notes and sample codes written by the author while he was learning Java tools himself. Topics include java, javac, jar, jdb, jar, javap, keytool, jconsole, jps, jstatd, jstat, jinfo, jmap, jhat, jstack.
2016-01-12, 3452👍, 1💬

💬 2016-01-12 ASHIS BEHERA: IT IS VERY GOOD

PKI Tutorials - Herong's Tutorial Examples
This PKI (Public Key Infrastructure) tutorial book is a collection of notes and sample codes written by the author while he was learning PKI technologies himself. Topics include CA, Certificate, Crypt::SSLeay, C#, Digital Signature, Firefox, HTTPS, IE, Java, JSSE, KeyStore, keytool, MMC, .NET, OpenS...
2016-02-07, 3395👍, 1💬

💬 2016-02-07 john: thanks!

java.util.Locale - Localization and Internationalization
This section provides a tutorial example on how to use java.util.Locale class to verify the default locale and list all supported locales. A locale is an identification of a combination of human language and country.
2016-12-19, 3327👍, 3💬

💬 2016-12-19 jfseb: Note that java locales do not correspond in all versions to ISO 639. e.g. hebrew is now he, not iw. https://en.wikipedia.org/wik...

💬 2016-05-06 Scrijna: P.S. It's also useful for Java, iOS and Windows localization, as it supports most popular localization formats.

💬 2016-05-06 Scrijna: For Android app localization, you could try using the localization tool https://poeditor.com It's useful for collaborative trans...

What Is SHA1 Message Digest Algorithm?
This section describes what is SHA1 (Secure Hash Algorithm 1) - a message digest algorithm which takes as input a message of arbitrary length and produces as output a 160-bit 'fingerprint'.
2016-01-18, 3326👍, 4💬

💬 2016-01-16 raza: i am raza see you latter

💬 2015-10-10 Herong: Ash, the next tutorial may help you understand better: SHA1 Message Digest Algorithm Overview

💬 2015-10-09 Ash: Please can u explain clearly..I dint understood

💬 2015-09-30 Hassan: hassan.ali.shaheen@gmail.com

"base64Binary" Datatype Values and Representations
This section describes the built-in primitive datatype, 'base64Binary' that represents binary data represented in Base64 encoding. Whitespaces are allowed and removed.
2015-10-01, 3233👍, 2💬

💬 2015-10-01 Herong: Harsh, if you are getting an image as a Base64Binary element in an XML file, you need to save it in a file, run Base64 decode on...

💬 2015-09-30 Harsh: I am getting output in base64binary now i want to print that image to the printer how can i do it?

"bad decrypt:./crypto/evp/evp_enc.c:461" Error
This section provides a tutorial example on why OpenSSL 'pkcs12' failed with 'bad decrypt:./crypto/evp/evp_enc.c :461'error. The root cause is the key password different than file password.
2015-09-10, 3160👍, 1💬

💬 2015-09-10 Action Here: this totally helped me.

Inserting BLOB Values with setBinaryStream() Method
This section describes how to insert BLOB values with the PreparedStatement.setBinaryStr eam()method.
2016-04-08, 3114👍, 2💬

💬 2016-04-08 Herong: Saqib, you are welcome!

💬 2016-04-06 Saqib Ayub: Just want to thank you so much. You made my day.

Chinese Character String with UTF-8 Encoding
This section providing information on handling Chinese character string literals in UTF-8 encoding.
2017-01-04, 3112👍, 8💬

💬 2016-03-10 Herong: Developers are welcome! ☺

💬 2016-03-09 as: o i am developer

💬 2016-02-15 test: Hello i am developer

💬 2015-11-07 Herong: 間單 and 间单 are corrected now. Thanks again for your comment. ☺

💬 2015-10-31 Herong: Yeah. I will fix it later. Thanks.

(More comments ...)

Removing IE Addon "Skype Browser Helper"
This section provides a tutorial example on how to disable and remove 'Skype Browser Helper' addon from Internet Explorer.
2016-02-08, 3071👍, 1💬

💬 2015-10-15 Theresa Zabolotny: There is no remove button on this one thanks or I would not be contacting you.

GB2312 Tutorials - Herong's Tutorial Examples
This free book contains Herong's notes and tutorial examples on Chinese GB2312 character set. It provides a mapping table of all GB2312 characters, native codes, corresponding Unicode codes and UTF8 codes. The Java program source code that produces the mapping table is also included. Topics include ...
2016-07-14, 3066👍, 2💬

💬 2016-07-14 Herong: Hi James, you can try my Chinese-Pinyin Translator. But it only covers GB2312 Chinese characters. My email address is on the PDF...

💬 2016-07-07 James Lin: Hi Dr. Yang, may I know if you can point me to some useful resource to obtain a listing of the actual pinyin keystrokes for all ...

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