1. Introduction Java provides the java.util.concurrent package since 1.5 to support parallel execution. It improves the performance when dealing with a time consuming task. The java.util.concurrent.FutureTask class provides a base implementation of the java.util.concurrent.Future interface. The following class diagram outlines FutureTask and its relationship with Callable, Runnable, Future, Executor, and ExecutorService. Figure 1 FutureTask Class Diagram In this example, I ...

In this article, we will learn how to Convert Double to String in Java. 1. Introduction Java language provides a Double and String types. A java.lang.Double class represents a floating-point number and java.lang.String class represents a sequence of characters. In this example, I will demonstrate how to convert a Double to String by utilizing the following classes: java.lang.Doublejava.lang.Stringjava.text.DecimalFormatjava.lang.StringBufferjava.lang.StringBuilder. 2. Technologies ...

In this article, we are going to introduce a Solr Project using Solr Core as a Search Engine. 1. Introduction Apache Solr is an open-source search platform based on Apache Lucene. It’s written in Java. A Solr Core refers to a single index and associated transaction log and configuration files. We can perform operations like indexing, analyzing, searching at a ...

This is a turorial about the Apache Kafka Basic Operations. 1. Introduction Apache Kafka is a streaming process software platform. In this example, I will show the following basic operations with a Windows computer: How to start/stop serverHow to create and list topicsHow to consume messages from a topic 2. Technologies Used The example commands in this article uses: Apache ...

In this example, I will show you how to download and install Apache Kafka on a Windows 10 machine. 1. Introduction If you develop an application utilizing Apache Kafka on a Windows computer, it’s better to have Apache Kafka installed locally so you can run integration testing at your workstation. 2. Prerequisite Apache Kafka requires JDK 1.8+. Apache Kafka 2.1.0+ ...

This is a tutorial about Apache Kafka for beginners. 1. Introduction Apache Kafka is a streaming process software platform developed by Apache Software Foundation in Scala and Java. It was originally developed by LinkedIn. Here are common terminologies used in Kafka: Kafka cluster – Zookeeper manages it via server discovery.Kafka broker – it is a Kafka server.Record – it is ...

1. Introduction Java Virtual Machine (JVM) is a type of process virtual machine which designs to execute Java computer programs in a platform-independent environment. It was first released by Sun Microsystems in 1994 and then split into JVM specification and implementation in 2006. The JVM specification is maintained by Java Community Process (JCP). Click here for a list of JVM ...

In this article, we will explain Java Swagger through a tutorial with examples. 1. Introduction Swagger was first released in 2011 to ease the Restful API documentation and client SDK generation during the development of Wordnik‘s products. In 2015, SmartBear software company donated the Swagger specification to open source which is sponsored by Linux Foundation, Google, IBM, and Microsoft. The ...

In this article, we are going to see the difference between map and flatMap methods in Java. 1. Introduction Java has provided Stream interface since version 8. The map() and flatMap() are two intermediate operations. Here are the method signatures: /* Returns a stream consisting of the results of applying the given function to the elements of this stream. Type ...

In this article, we will introduce you to Docker vs Kubernetes and their most important differences. 1. Introduction Docker and Kubernetes are two open-source tools that work together to ensure that an application works anywhere and runs at the desired state all the time. The following diagram outlines developing, packaging, and deploying steps utilizing Docker and Kubernetes. Figure 1 Application ...