To make things practical, we’ll analyze a question in the style of the certification exam.

Read more 👉 https://lttr.ai/An9r8

#java21 #Java21Certification

For years we accepted a trade-off: Python for scripts, Java for systems.

With JBang and Java 21, that trade-off is gone.

You can now write single-file Java scripts with near-zero friction and promote them to production without a rewrite.

Hands-on examples: HTTP servers, CLIs, async clients, matrix math.

https://www.the-main-thread.com/p/java-is-the-new-python-jbang-java-21

#Java #JBang #Java21 #DevExperience #SoftwareEngineering #JVM

True or False: A named module can read from the unnamed module only if the requires directive is present?

Read the full article: Java 21 Certification Guide - Part 6
▸ https://lttr.ai/An2Fq

#certification #java21 #Java21Certification

Создаем Telegram-бота для отслеживания погоды за 5 минут с помощью Nyagram (а не очередного PizzaBot)

В большинстве туториалов по Java-ботам нам предлагают написать EchoBot или магазин пиццы на огромных switch-case конструкциях. Но в 2026 году, когда у нас есть Java 21 и Spring Boot 3 , писать бойлерплейт — это преступление против продуктивности. Сегодня мы напишем WeatherBot — полезного бота, который показывает реальную погоду через API OpenWeatherMap, имеет кнопку обновления "на лету" и, используя FSM (Машину состояний) с валидацией данных, позволяет настроить ежедневную рассылку прогноза.

https://habr.com/ru/articles/991414/

#telegram #java #telegrambot #github #java21 #spring_boot #spring_mvc #боты #tutorial #программирование

True or False: An unnamed module includes all the classes on the classpath that are not part of any named module ?

Read the full article: Java 21 Certification Guide - Part 6
▸ https://lttr.ai/Ama5C

#certification #java21 #Java21Certification

The Java SE 21 certification is currently the latest available exam, and let me tell you: it’s tough, but not impossible.

Read more 👉 https://lttr.ai/Ama49

#java21 #javaCertification #certification

In this article, we’ll focus on bitwise operations and binary number representation.

Read more 👉 https://lttr.ai/Ama47

#java21 #Java21Certification

In this article, we’ll focus on modules, introduced on Java 9.

Read more 👉 https://lttr.ai/AnXPL

#certification #java21 #Java21Certification

The goal here is to expose you to several tricky details that often show up in the Java 21 certification exam.

Read more 👉 https://lttr.ai/AnUj1

#Java21 #Java #certification

Java 21 Certification Guide - Part 5
▸ https://lttr.ai/Ama4x

#java21 #Java21Certification