CS++ Java IDE vs Greenfoot

CS++ Java IDE lets users write and run Java in a browser without installing a JDK. Its custom interpreter handles most of Java and core standard-library features, including classes, generics, collections, lambdas, and streams. A step-through debugger and clear error messages are included for beginners. The runtime does not support threads, writing files, reflection, enums, records, or switch expressions. The browser IDE works on Chromebooks, iPads, phones, Macs, and Windows PCs, including locked-down school devices. Users can begin without an account; signing in is optional and adds cloud saving across devices. Teachers can share starter code and worked examples by link, and use the IDE for demonstrations and homework. It is aimed at beginners and AP Computer Science A students, with supported topics extending beyond the exam to generics, collections, lambdas, and streams. The free plan supports writing, running, and auto-testing Java in a browser without signup to start. The listed pricing note says paid access starts at $9.99, though no paid plan details are provided here.

Greenfoot is educational software for learning object-oriented programming with standard Java code. Learners build games, simulations, and other graphical programs by placing actors in worlds. The programming environment combines visualization and interaction tools with an IDE that includes project management, auto-completion, and syntax highlighting. Projects can be published online for others to play and comment on, and sharing is built into the environment. Greenfoot runs on Windows, macOS, and Linux; downloads cover Windows 10 and 11, macOS 11 and later, Ubuntu with Debian support, and a generic option for systems with JDK and JavaFX. From version 3.6.0, Intel/AMD systems need a 64-bit CPU and operating system; version 3.5.4 is the listed option for 32-bit support. The software is free, and its IDE source code is available under the GNU General Public Licence version 2 with classpath exception. Learning resources include written and video tutorials for beginners and advanced users, along with the Greenroom instructor community.