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Singleton Design Pattern in Java
Singleton is frequently used in applications where resource may be expensive to create and no instance specific state needs to be maintained. For example, when creating database connection, a singleton may be needed. Today we will share the famous Singleton design pattern in Java. 1. Definition Singleton design pattern is a design pattern that restricts the instantiation of a class to one object. It is one of the most well-known design patterns. 2. Application Singleton ...
DESIGN PATTERN,SINGLETON,MULTITHREAD,JAVA 2020-04-11 02:16:28
Build Hadoop environment in Linux
Hadoop standalone installation: 1. Install JDK Install JDK with below command: sudo apt-get install sun-java6-jdk Configure Java environment, open /etc/profile, add below contents: export JAVA_HOME = (Java installation directory) export CLASSPATH =".:$JAVA_HOME/lib:$CLASSPATH" export PATH = "$JAVA_HOME/:PATH" Verify installation of Java Type java --version, if it outputs Java version information, then Java is successfully installed. 2. Install SSH Install SSH with below command: sudo ...
Hadoop.Linux,Configuration 2013-07-31 23:22:27
Microsoft Interview Riddle Questions
Every year, many people will send their resume to Microsoft and Google. So how do these IT companies hire people? What kind of interview questions will they ask. Let's see what Microsoft asked before in this article. These questions are more focusing on how you are reasoning, not necessary your technical skills. 1. You’ve got someone working for you for seven days and a gold bar to pay them. The gold bar is segmented into seven connected pieces. You must give them a piece of gold at...
Microsoft,Interview question,Riddle questions,Answer 2012-03-10 04:56:48
A guide on installing and setting up GitLab server on Ubuntu
GitHub, GitLab and BitBucket are the three most famous code hosting platform in the world. They have different features which allow teams or individuals to share code with others remotely. In case you want to build your own code hosting server so that you can host and share the code by yourself, you can install and set up your own server. In this post, we will walk you through a guide on installing and setting up GitLab server on Linux environment. gitlab is a web based code hosting tool which i...
OpenLDAP Proxy -- Installation and configuration
After understanding what the configuration would be for an OpenLDAP proxy, it's time to explain the installation of OpenLDAP proxy and how to make it run. In this post, we will cover how to install OpenLDAP proxy both locally and using docker. Local installation The installation is quite easy, there are a few packages to be installed including the ldap server, ldap client and some utilities. Below steps are for CentOS, the instructions for other platforms should be similar with minor differ...
INSTALLATION,CENTOS,DOCKER,OPENLDAP,OPENLDAP PROXY 2017-11-03 20:26:41
The craziest Javascript implementations
Since its birth in 1994, Javascript has come a long way. Today it’s one of the most popular programming languages on the web because of high popularity of AJAX based web-applications. Also the rise of micro-frameworks such as jQuery (also Prototype, Moo Tools etc) which have reduced dramatically the complexity of code developers needed to write, it is well tested, has a ton of plug-ins, has a large development community and reduced development time.And lately even Server-S...
JavaScript,Crazy implementation,JVM,Turing machine 2012-01-03 12:09:42
Landing page optimization : Less is more
There is a question on Quora : Why doesn't Quora show interesting questions/answers on their landing page? Why is it this? not this? Quora's product manage gives his answer to this question, it's agreed by many users in this community. Here is his answer: The logged out homepage is pretty sparse now mostly because it hasn't been given much treatment since the initial product launch. But we have plans on redesigning it and testing different variations (some with less info on the page, some with...
Landing page,Optimization,Principle 2012-11-03 01:50:07
Learn about the Benefits of Providing an Engaging Onboarding Experience to your customers
Learn about the Benefits of Providing an Engaging Onboarding Experience to your customers A good onboarding experience helps create a positive first impression and makes your customers feel valued and helps convert leads into paying customers. Effective onboarding experiences also increase conversions and keep customers. High-quality onboarding experiences build brand awareness. Customers notice when businesses take time to engage with them. They even notice when businesses care about them and t...
Java’s toLowerCase() has got a surprise for you!
Have you ever encountered a surprise while using toLowerCase()? This is a widely used method when it comes to strings and case conversion. There is a nice little thing you should be aware of. toLowerCase() respects internationalization (i18n). It performs the case conversion with respect to your Locale. When you call toLowerCase(), internally toLowerCase(Locale.getDefault()) is getting called. It is locale sensitive and you should not write a logic around it interpreting loca...
Java,toLowerCaser(),Locale specific,Stra 2011-09-29 11:21:07
Guide to Clearing Storage Space on a Macbook
Macbooks are pretty notorious when it comes to what storage space you have available. Those few gigabytes that you have will disappear in no time if you are not careful. The whole issue becomes even more problematic for people who are not that familiar with Macbooks or have switched from another computer. And if you do not pay attention, it will not take too long before you have next to no storage space on the hard drive. Leaving only a few gigabytes of free space will significantly reduce the ...
MACBOOK,APPLE,DATA STORAGE 2020-08-08 00:21:42
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