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Core Java Interview Questions

Q. What if the main method is declared as private? Answer: The program compiles properly but at runtime it will give “Main method not public.” message. Q. What is meant by pass ...
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Speed Up with Fast Java and File Serialization

Since the first version of Java, day-by-day many developers have been trying to achieve at least as good of performance as in C/C++. JVM vendors are doing their best by implementing ...
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Google Cloud Messaging: Collapsible Messages

In a previous article, we looked at how to set up Google Cloud Messaging (GCM) in Android applications. We learned that GCM is a free service that allows us to push messages from the ...
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Backreferences in Java Regular Expressions

Backreferences in Java Regular Expressions is another important feature provided by Java. To understand backreferences, we need to understand group first. Group in regular expression ...
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Testing Java EE 6 with Arquillian (incl. JPA, EJB, Bean Validation and CDI)

For a very long time, I heard quite a lot of people saying good things about Arquillian. Whilst I have been reading articles around its use, I couldn’t really find one that covers ...
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A clean approach to Wicket models

One of the core concepts of Apache Wicket web framework is the model and IModel as its programming interface. Wicket components rely heavily on models, which makes them important ...
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Reasons to consider spring-boot for your next Spring based application!

Spring-boot  provides a quick way to create a Spring based application. There are some very compelling reasons to consider spring-boot for your next project: Reason 1 : Simpler Dependency ...
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Batch Writing, and Dynamic vs Parametrized SQL, how well does your database perform?

One of the most effective database optimizations is batch writing. Batch writing is supported by most modern databases and part of the JDBC standard and is supported by most JPA providers. Normal ...
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Java 7 vs Groovy 2.1 Performance Comparison

I haven’t used Groovy for 2 years, since my last touch with Grails. I get stuck in (hard)core Enterprise Java, with some performance aspects in background. I’ve almost missed ...
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Android Geofencing with Google Maps

A geofence is a virtual perimeter of interest that can be set up to fire notifications when it is entered or exited, or both. For example, a geofencing app can alert us that our kid ...
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