RabbitMQ is a free and open source message broker which enables sending messages between applications. Come on in for more… — Well, let’s say we have a distributed system and services. A simple way to enable communication between those services is to make them call each other directly. This is called RPC-style communication. RPC stands for remote procedure call. We know the address (URL or IP Address) of the service we…

In order to compare the performances of different algorithms, we need to look at several qualities of those algorithms: like the space it… — Algorithm is a finite sequence of well-defined, computer-implementable instructions, typically to solve a class of problems or to perform a computation, and as anything else, we need a standard way to measure the performances of these algorithms to decide which ones to use in our programs.

java.util.stream (which was added in Java8) is composed of classes that enables processing stream of elements. — java.util.stream (which was added in Java8) is composed of classes that enables processing stream of elements. 1.What is a stream? A stream is a flow of objects that we can apply methods on to create the results we want. As it was stated here, it is not a data structure…

JVM (Java Virtual Machine) is the layer between Java application and operating system and its sole purpose is to execute any program that… — JVM (Java Virtual Machine) is the layer between Java application and operating system and its sole purpose is to execute any program that is compiled to Java bytecode. Whenever you run a Java application, an instance of JVM is created and when the application completes, the instance dies.

Let’s say that you have a json file which you want to map to a table in the database in your application with Spring Boot — Let’s say that you have a json file which you want to map to a table in the database in your application with Spring Boot First, in order to map this to a class, we need to create an entity. import javax.persistence.Entity; import javax.persistence.Id; import javax.validation.constraints.Size;

1. Constructors are code blocks that run every time a class is instantiated by using new keyword. — 1. Constructors are code blocks that run every time a class is instantiated by using new keyword. 2. No argument constructor is called default constructor. 3. Every class has to have at least one constructor. If no constructor is given in the class definition, compiler will define default constructor for…

When I was looking at the source code of ArrayList, I saw that the actual array that holds the data items was defined as  private… — When I was looking at the source code of ArrayList, I saw that the actual array that holds the data items was defined as I had no idea what transient meant. So I looked it up, but before explaining what transient means and why elementData in ArrayList is defined as…