URL: https://www.progressiverobot.com/java-thread-wait-notify-and-notifyall-example/ The Object class in java contains three final methods that allows threads to communicate about the lock status of a resource. These methods are wait(), notify() and notifyAll(). So today we will look into wait, notify and notifyAll in java program. wait, notify and notifyAll in Java ![wait and notify in java, wait […]
URL: https://www.progressiverobot.com/jdbc-interview-questions-and-answers/ Welcome to JDBC Interview Questions and Answers. JDBC API is used to connect to relational databases and run SQL queries from Java Programs. In the last few articles, we learned about JDBC API and its important features. This article is aimed to provide some of the important JDBC Interview Questions with Answers to […]
URL: https://www.progressiverobot.com/log4j-levels-example-order-priority-custom-filters/ If you have used log4j, you will notice that there are many methods to log messages. For example: logger.trace("My Log message"); logger.debug("My Log message"); logger.info("My Log message"); Actually they corresponds to log4j levels. Log4j Levels Log4j provides many logging levels. Below is the complete list. TRACE: The TRACE Level designates finer-grained informational events […]
URL: https://www.progressiverobot.com/mockito-verify/ Mockito Verify methods are used to check that certain behavior happened. We can use Mockito verify methods at the end of the testing method code to make sure that specified methods are called. Mockito Verify Mockito verify() method can be used to test number of method invocations too. We can test exact number […]
URL: https://www.progressiverobot.com/regular-expression-in-java-regex-example/ Welcome to Regular Expression in Java. It's also called Regex in Java. When I started programming, java regular expression was a nightmare for me. This tutorial is aimed to help you master Regular Expression in Java. I will also come back here to refresh my Java Regex learning. Regular Expression in Java ![Regular […]
URL: https://www.progressiverobot.com/state-design-pattern-java/ State design pattern is one of the behavioral design pattern. State design pattern is used when an Object change its behavior based on its internal state. State Design Pattern  If we have to change the behavior of an object based on its state, […]
URL: https://www.progressiverobot.com/threadpoolexecutor-java-thread-pool-example-executorservice/ Java thread pool manages the pool of worker threads. It contains a queue that keeps tasks waiting to get executed. We can use ThreadPoolExecutor to create thread pool in Java. Java thread pool manages the collection of Runnable threads. The worker threads execute Runnable threads from the queue. java.util.concurrent.Executors provide factory and support […]
Today we will look into Bridge Design Pattern in java. When we have interface hierarchies in both interfaces as well as implementations, then bridge design pattern is used to decouple the interfaces from implementation and hiding the implementation details from the client programs. Bridge Design Pattern Just like [Adapter pattern](/community/tutorials/adapter-design-pattern-java "Adapter Design Pattern in Java […]
Composition vs Inheritance is one of the frequently asked interview questions. You must have also heard to use Composition over Inheritance. Composition vs Inheritance Both composition and inheritance are [object-oriented programming concepts](/community/tutorials/oops-concepts-java-example). They are not tied up with any specific programming language such as Java. Before we compare composition over inheritance programmatically, let's have a […]
This tutorial shows you how to build a log solution using three open source software components: [Elasticsearch](http://www.elasticsearch.org), [Fluentd](https://www.fluentd.org) and [Kibana](http://www.kibana.org).
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