CodeGym

CodeGym is for people who want to learn Java from scratch or practise and strengthen skills they already have. Its self-paced course combines short theory lessons with coding exercises that start with basic syntax and progress to topics such as object-oriented programming, collections, exceptions, and multithreading. You write code to solve tasks and get automated checks on your solutions, so you can see whether they work as you go. Lessons and exercises are arranged in game-like stages, with completed work helping unlock further material. CodeGym also supports solving tasks through an IntelliJ IDEA plugin and offers an Android app for studying on a phone. The self-paced course is suited to learners who prefer frequent hands-on practice. CodeGym also offers separate mentor-led programs with scheduled group sessions, chat support, and practical projects for those who want more structure and instructor feedback.

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