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Programming Leftovers

Submitted by Roy Schestowitz on Monday 7th of March 2022 12:24:09 AM Filed under
Development

  • TWC Episode 154 - Padawan Missing

    In which we search for a needle in a lendee
    (or maybe a chatchka in a haystack),
    and delight in some lazy CPAN comfort.

  • Dirk Eddelbuettel: nanotime 0.3.6 on CRAN: Updates

    Leonardo and I are pleased to another update to our nanotime package bringing it to version 0.3.6 which landed on CRAN earlier today.

    nanotime relies on the RcppCCTZ package (as well as the RcppDate package for additional C++ operations) and offers efficient high(er) resolution time parsing and formatting up to nanosecond resolution, and the bit64 package for the actual integer64 arithmetic. Initially implemented using the S3 system, it has benefitted greatly from a rigorous refactoring by Leonardo who not only rejigged nanotime internals in S4 but also added new S4 types for periods, intervals and durations.

  • Encapsulation in Java | Explained

    Encapsulation is one of the most significant concepts of object-oriented programming that provides security by hiding the sensitive data/implementation details of the class from the users. In Java, encapsulation can be achieved by declaring the class attributes/variables as private. In certain cases, we need to access or modify the private variables, so in such a scenario, we can use the public get and set methods.

  • Constructor in Java | Explained

    Object-oriented programming provides a concept of constructors that allows us to initialize the newly created objects. A constructor is a special type of method/function having the same name as the class name and a constructor doesn’t have a return type.

  • Classes and Objects in Java | Explained

    Object-oriented programming has four primary/fundamental concepts i.e. inheritance, encapsulation, abstraction, and polymorphism, and all these concepts revolve around the classes and objects. A class is a blueprint/template that represents the properties and behavior of the objects while the objects are instances of a class. In java, defining the class wouldn’t take any memory until an object of the class is created.

  • Class Methods in Java | Explained

    In Java, a method is nothing but a block of code/statement that is declared within the class and can perform different actions when someone calls it. Some methods can be called directly with their name (i.e. without creating the class object) while some methods require instance/object of the class (i.e. must be invoked with the object of the class).

    The methods that can be called directly are referred as a class or static methods, while the methods that need an object of the class to be invoked are referred as instance or non-static methods.

  • Abstraction in Java | Explained

    Data Abstraction is one of the most important concepts of OOP that shows only essential details to the user and hides the desired details from the users. All in all the main purpose of abstraction is to provide security.

    The best example of abstraction can be an ATM machine which can be used for cash transfer, withdrawal, inquiring account balance, etc. We utilize ATM machines to achieve different functionalities but when we put the card in the ATM, we have no idea what operations are happening within the ATM machine. That’s exactly what abstraction classes, methods, and interfaces do in Java.

»

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.

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