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Javin Paul
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15 Technical Java Interview Questions
Some of the technical questions from Java programming Job interviews http://java67.blogspot.com/2013/07/15-advanced-core-java-interview-questions-answers-senior-experienced-5-6-years-programmers-developers.html #Java   #JVM  
When the experience of a Java Programmer grows in the years e.g. when it goes from beginner years ( 2 to 4) to more experience or sort of senior level ( 5 to 7 years), Core Java Interview Questions also changes a bit. Of cour...
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15 Technical Java Interview Questions
Some of the technical questions from Java programming Job interviews http://java67.blogspot.com/2013/07/15-advanced-core-java-interview-questions-answers-senior-experienced-5-6-years-programmers-developers.html #Java   #JVM  
When the experience of a Java Programmer grows in the years e.g. when it goes from beginner years ( 2 to 4) to more experience or sort of senior level ( 5 to 7 years), Core Java Interview Questions also changes a bit. Of cour...
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When to use Command design pattern in Java?
You should Command design pattern if you need to de-couple command with their action e.g. in a video game you can assign X key to jump or fire, this is possible only if you decouple action with command. Command pattern also let you do implement REDO and UNDO functionality because it can keep records of commands. http://javarevisited.blogspot.com/2016/05/command-design-pattern-in-java-example-code.html #programming   #Java  
In simple words, Command design pattern is used to separate a request for an action from the object which actually performs the action. This decoupling between Invoker and Receiver object provides a uniform ways to perform different types of actions. This decoupling is achieved using a Command ...
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how to set JAVA_HOME in Linux
Step by step guide to set the JAVA_HOME and PATH in Linux. You can set that in your .bash_profile or /etc/profile file as shown here http://java67.blogspot.com/2016/06/how-to-set-javahome-and-path-in-linux.html #Java   #Linux  
The JAVA_HOME environment variable points to the JDK installation directory and used by many Java tools and applications like Eclipse, Maven, ANT, Tomcat etc. to figure out Java executables as they need Java for running. Unfo...
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Today we will take a look at another simple programming exercise, write a program to check if a number is binary in Java. A number is said to be binary if it only contains either 0 or 1, for example, 1010 is a binary number but 1234 is not. You can not any library method to solve this problem, ...
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How to use spaces instead of tabs in Eclipse?
Here is guide to change the default setting of Eclipse for Java code editor which force you to use the tabs. Using hard tab means differnet formatting and indentation on different editors because TAB has different meaning in different text editors. http://javarevisited.blogspot.com/2016/06/how-to-make-eclipse-use-spaces-instead.html #Java   #Eclipse  
I use Eclipse IDE extensively to write Java programs for testing and example purpose, but when I copy those program in any text editors e.g. VIM, Notepad, TextPad or Edit plus, the indentation goes weird. I see a lot of white spaces which makes the program wider than expected.
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Difference between Connected and Disconnected RowSet in JDBC
The Java database connectivity (JDBC) API offers two kinds of RowSet, connected and disconnected, one which can operate without a DB connection object, find out more about them in this article http://javarevisited.blogspot.com/2014/04/Connected-vs-disconnected-rowsetprovider-rowsetfactory-and-rowset-JDBC-Java.html #JDBC   #Java  
RowSet interface is another key interface from JDBC API, which extends the ResultSet interface to provide support for the JavaBean component model. Along with convenient methods to set connection parameters e.g. setUrl(), setUsername(), setPassword() and setCommand(), it also defines getters and ...
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How to convert java.sql.Date to java.util.Date in JDBC
The JDBC API has different classes to complaint with Database's DATE, TIME and DATETIME type in Java e.g. java.sql.Date, java.sql.Time, and java.sql.Timestamp. Even though SQL classes are subclass of java.util.Date there are some key difference which should remember while converting one type to other. I have tried to explain them on this article, have a look http://javarevisited.blogspot.com/2016/06/how-to-convert-javasqldate-to-java-util-date-jdbc-example.html #Java   #JDBC  
You often need to convert java.sql.Date to java.util.Date while interacting with databases from Java application. Since JDBC the Java API for database connectivity uses java.sql.Date to represent and most of the java code accepts java.util.Date, you have no choice but to convert SQL date to util ...
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Difference between static and non-static method in Java?
Some fundamental difference between instance and static method in Java programming http://java67.blogspot.com/2016/04/difference-between-static-vs-non-static-method-in-java.html #java  
One of the key difference between a static and a non-static method is that static method belongs to a class while non-static method belongs to the instance. This means you can call a static method without creating any instanc...
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How to close telnet terminal in UNIX
Even though telnet is a basic command if you use it after long time, you may forget how to come out of it because its not so obvious. The usual quit, exit or Ctrl + C won't work until you type escape characters, which is a key here. http://javarevisited.blogspot.com/2016/06/how-to-close-telnet-terminal-in-linux-windows-quite-exit-not-working.html #UNIX   #Linux  
The telnet is one of the most useful networking commands, which is used to check if a server is listening on a particular port on the remote host, but it's a little bit tricky to use, especially, if you are not using it daily. Though I have used telnet before, but when I use it after a long time ...
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Why use SLF4j over Log4j for logging in Java?
Here are some reasons which you should know before choosing between SLF4j and Log4j http://javarevisited.blogspot.com/2013/08/why-use-sl4j-over-log4j-for-logging-in.html #Java   #Logging   #Log4j  
Every Java programmers know that logging is critical for any Java application, especially server-side application, and many of them are already familiar with various logging libraries e.g. java.util.logging, Apache log4j, logback, but if you don't know about SLF4J, Simple logging facade for Java ...
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How to add two integer array in Java?
Since Java doesn't support operator overloading you cannot add the two arrays using + operator, instead you need to loop over array and add each elements as shown in following example http://java67.blogspot.com/2016/06/how-to-add-elements-of-two-arrays-in-java-example.html #java   #array  
One of the common programming exercise on various Java course is addition and multiplication of two arrays. How do you add two integer arrays in Java? Can you add two String array? how about other data types etc? These are so...
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Hi, I am Javin Paul, I have been working in Java, Unix, MySQL, FIX Tutorial and TIbco RV messaging technology .
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Hi, I am Javin Paul. I have been working in Java, FIX Tutorial and TIbco RV messaging technology from past 7 years. I am interested in writing and meeting people, reading and learning about new subjects and I have my own website Javarevisited,  Java67 and  Savingfunda: Saving and Investment Tips that takes up most of my time and is a labour of love for me. 
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