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How to Convert Byte Array to InputStream and OutputStream in Java

Are you stuck with your coding because you have a byte array and next method in chain needs an InputStream? don’t worry Java has solution for that, You can use ByteArrayInputStream ...
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Difference between State and Strategy Design Pattern in Java

In order to make proper use of State and Strategy design Pattern in Core Java application, its important for a Java developer to clearly understand difference between them. Though both ...
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10 JDK 7 Features to Revisit, Before You Welcome Java 8

It’s been almost a month Java 8 is released and I am sure all of you are exploring new features of JDK 8. But, before you completely delve into Java 8, it’s time to revisit ...
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Difference between WeakReference vs SoftReference vs PhantomReference vs Strong reference in Java

WeakReference and SoftReference were added into Java API from long time but not every Java programmer is familiar with it. Which means there is a gap between where and how to use WeakReference ...
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Why use Underscore in Numbers from Java SE 7 – Underscore in Numeric Literals

JDK 1.7 release had introduced several useful features, despite most of them being syntactic sugar, there use can greatly improve readability and code quality. One of such feature is ...
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File Upload Example in Servlet and JSP

Uploading File to server using Servlet and JSP is a common task in Java web application. Before coding your Servlet or JSP to handle file upload request, you need to know little bit ...
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How to create Thread Pools using Java 5 Executor Framework

Java 5 introduced Thread pool in Java in form of Executor framework, which allows Java programmer to decouple submission of task to execution of task. If you are doing server side programming ...
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10 XML Interview questions and answers for Java Programmer

XML Interview questions are very popular in various programming job interviews, including Java interviews for web developer. XML is a matured technology and often used as standard for ...
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Hibernate: save vs persist and saveOrUpdate

What is difference between save and saveOrUpdate or Difference between save and persist ...
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Measure execution time in Java – Spring StopWatch Example

There are two ways to measure elapsed execution time in Java either by using System.currentTimeinMillis() or by using System.nanoTime() ...
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