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This website is better known for its web developer support, but Java is a popular language amongst web developers so it has a comprehensive Java section. But it also has a bunch of articles, interviews, and opinion pieces that are fun to read.

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LeetCode has a web-based Playground IDE that you can use to quickly test out Java code (along with many other languages). Every object and class you encounter is detailed in a standardised manner. The Java API is one of the best maintained set of documents in existence. As well as covering the basics, it dives deep into esoteric concepts such as compiling and the JVM (Java Virtual Machine). If you only buy one book on Java, then make sure it’s this one. Java is a useful language for thinking about coding concepts, and this book is the ideal partner for the curious coder.

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Once you get past the nuts and bolts, it’s time to start thinking about how to improve as a programmer. Written by Java guru Herbert Schildt and published by Oracle Press, this feels to us like the closest thing to an official guide. While edX might not be the best place to start, it’s the place to head after you’ve got some grounding in programming and want a challenge. So be prepared to put in more hours than course providers suggest. We’ve found the estimated effort to be lowballed.

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However, you can enrol on most courses for free and often the learning is worth it regardless. The courses are definitely a challenge, and you can pay to have a verified certificate. You’ll find a dedicated bunch of individuals in the forums and keen staff willing to nudge on newcomers. Many courses are self-paced, but some follow a strict timetable with projects and final exams.

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MIT has also offered courses in the past, although none of its Java software development courses are running at the moment.

The Java courses are provided by a range of different institutions, including Microsoft, Red Hat, and UBC. Intended as university-grade courses, MOOCs are challenging but rewarding and you get to share the experience with other learners online. If you want to take your Java learning to a professional level, check out the selection of MOOCs (massive open online courses) taking place on edX. Make sure you download the correct project files for the Pi and its Greenfoot IDE 2.4 – they’re marked ‘Old version of book scenarios for Greenfoot 2.x’ on the book’s webpage. This book has fun projects to follow, including building a piano, simulating bubbles and leaves floating in the air, foxes and rabbits, and a simulation of the motion of stars and planets. So you get a good combination of standard programming and visual execution. Its actors and worlds are coded in standard Java. This visual nature enables Greenfoot to leapfrog the abstract nature of programming, with students able to see their objects interacting in a visual manner. Students create ‘actors’ which live in this world, and use it to build games, simulations, and other graphical programs. The Greenfoot IDE creates a visual world for your Java classes to live in, much like Scratch or Blockly. On the Pi you’ll find it under Programming in the Raspbian menu. Greenfoot is a Java IDE developed by Michael Kölling from King’s College London. Introduction to Programming with Greenfoot This is especially handy given Java’s obtuse nature. Click Run and check the output in the terminal.Ĭodecademy is superb at hand-holding, and the web-based setup is ideal for beginners. Typically you’ll find boilerplate code in the editor and have to add elements by following the instructions. The window is split into three columns: on the left is the lesson text in the middle is a code editor on the right is an emulated terminal. You learn via interactive lessons that run inside the Chromium browser. On Codecademy you’ll find a comprehensive stack of tutorials that cover all the basics from the Java syntax, through to creating objects and data structures.

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You can follow some introductory lessons, but you’ll need to get the $20 a month Codecademy Pro plan to finish it. Learn Java is its flagship course, but sadly not one of the free ones. This article first appeared in The MagPi 78 and was written by Lucy HattersleyĬlaiming over 25 million users, the Codecademy website has courses (many free) on a plethora of different programming languages and tools. There’s no denying its power and popularity, though. Java isn’t like other languages, and its complex and wordy syntax can be baffling for beginners.