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Java

How to check if a integer is not a decimal in Java

In Java, you can use the modulus operator (%) to check if an integer value is not a decimal. The modulus operator returns the remainder of a division operation, and if the remainder is zero, it means that the number is divisible by the divisor without any remainder, that means it's

Java

IllegalStateException vs IllegalArgumentException in Java

In Java, IllegalStateException and IllegalArgumentException are both subclasses of the RuntimeException class, and they are used to indicate that a method has been invoked with an illegal or inappropriate argument or state. However, they are used to indicate slightly different things: * IllegalStateException is thrown when a method has been invoked

Java

What is bad smells in Java

Bad smells in Java (or "code smells") are characteristics of code that indicate that something is not quite right, and that the code may be difficult to understand, maintain, or extend in the future. These smells can be caused by a variety of factors, such as poor design, lack of

Java

Java Reflection explained

Java Reflection is a feature in the Java programming language that allows code to examine or modify the behavior of methods, classes, and interfaces at runtime. It is used to inspect, instantiate, and invoke classes and methods, as well as to examine and modify fields, and annotations. Reflection is implemented

Java

Type safety in Java

Type safety in Java refers to the ability of the Java programming language to ensure that a variable, a method, or an expression is used in a way that is consistent with its type. This means that the Java compiler and runtime system can detect and prevent certain type-related errors

Java

Sorting Maps in Java

In Java, you can use the TreeMap class to sort the keys of a map in natural order. TreeMap is a Red-Black tree based NavigableMap implementation. The map is sorted according to the natural ordering of its keys, or by a Comparator provided at map creation time, depending on which

Java

Processing zip-Files in Java

In Java, you can use the java.util.zip package to process Zip files. The java.util.zip package provides classes for reading and writing the standard ZIP and GZIP file formats. Here is an example of how you can use the java.util.zip package to unzip a file:

Java

Filter-Map-Reduce in Java

Java 8 introduced several functional programming concepts, including the Stream API, which provides a convenient way to filter, map, and reduce collections. Here's an example of using the Stream API to filter, map, and reduce a list of integers: import java.util.Arrays; import java.util.List; public class FilterMapReduceExample

Containerization

Running docker commands without sudo

Running Docker commands without using sudo can be useful for development and testing purposes. However, it is important to understand the security implications of this configuration and take appropriate measures to mitigate the risks. In order to run Docker commands without sudo, you need to add your user to the

Golang

goroutines in golang explained

A goroutine is a lightweight thread of execution in Go. Goroutines are similar to threads in other programming languages, but they are multiplexed onto a smaller number of system threads, and they are managed by the Go runtime. Goroutines are created by the go keyword, followed by a function call.

Containerization

how to install docker engine on debian

Installing the Docker engine on a Debian-based system is relatively straightforward. Here are the basic steps: Update the package list: Before installing any new packages, it's a good idea to update the package list to ensure that you have the latest version of Docker. Run the following command to update

Containerization

containerd.io vs docker-ce-cli vs docker-ce

"containerd.io" is a container runtime that is designed to be lightweight and modular. It is used to manage the entire lifecycle of containers, from image management to container execution and networking. containerd is a popular alternative to the standard runtime that ships with Docker, and it can be used

Containerization

getting started with containerd

containerd is a container runtime that is designed to be lightweight and modular. It is used to manage the entire lifecycle of containers, from image management to container execution and networking. containerd is used as the default runtime in many popular container orchestration platforms like Kubernetes, and it can also

Linux

Cannot connect to the Docker daemon at unix:/var/run/docker.sock. Is the docker daemon running?

This error message indicates that the Docker client is unable to connect to the Docker daemon, which is the background service that manages containers on your host machine. There are a few potential causes of this issue: 1. The Docker daemon may not be running on your host machine. You

Containerization

What is the difference between dockerd and docker

Docker and Dockerd are two separate components that work together to form the Docker runtime environment. "dockerd" is the daemon (or background service) that runs on a host machine, and it is responsible for creating, managing, and maintaining Docker containers. It does this by communicating with the Docker client through

Golang

Package and import in Go

In Go, a package is a collection of related Go source files that are compiled and stored together as a unit. Go programs are made up of one or more packages, and each package can be used by other packages. To use a package in your Go code, you need

Golang

Syntax in Golang

In Go, the syntax is the set of rules that define how a Go program is written and organized. Here are a few examples of Go syntax: Declaring variables: // Declare a variable of type int with the identifier "x" var x int // Declare a variable of type string with the

Golang

Datatypes in Golang

In Go, a data type is a category of types that represent a value with a specific set of characteristics. There are several built-in data types in Go, including: 1. bool: a boolean type that can be either true or false. 2. string: a sequence of Unicode characters. 3. int,

Golang

How to set up a Golang environment

To set up a Go development environment, you will need to do the following: 1. Download and install Go: Go can be downloaded from the official website at https://golang.org/dl/. Follow the instructions to install Go on your system. 2. Set up your Go workspace: Go uses a

Golang

7 reason to use Golang as programming language

1. High performance: Go is a compiled language and is known for its fast runtime and efficient memory usage. 2. Concurrency and parallelism: Go was designed with concurrency in mind and has first-class support for building concurrent and parallel programs. 3. Simplicity: Go has a simple and easy-to-learn syntax, as

Golang

History and design principles of Go

Go, also known as Golang, is a programming language developed by Google in 2009. It was created by a team of engineers led by Robert Griesemer, Rob Pike, and Ken Thompson, who were seeking to improve on existing languages such as C++ and Java. One of the main goals of

Java

Intermediate and Terminal Steams in Java

In Java, intermediate operations are operations that are applied to a stream and return another stream. These operations allow you to specify the operations to be performed on the data in the stream, but they do not actually process the data or produce a result. Here are some examples of

Java

Java Streams

In Java, streams are a way of processing data declaratively. They allow you to specify the operations to be performed on a data source, but not how those operations are performed. This makes it easy to write code that is expressive and easy to read, while still being efficient and

Java

Stack, queue and deque explained in Java

A stack is a data structure that operates on a last-in, first-out (LIFO) basis. This means that elements are added to and removed from the top of the stack. Stacks are often used to store data temporarily during the execution of a program, or to reverse the order of items.

Java

predefined algorithms for Collection class in Java

The java.util.Collections class is a utility class that provides a number of predefined algorithms for working with collections in Java. Here is a list of the algorithms provided by the Collections class: * addAll(): Adds all the elements of one collection to another. * binarySearch(): Searches for a specified element