Java Code Playground — Run & Debug Java Online
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About the Java Playground
Code Visualizer’s Java playground lets you write, compile, and run Java code directly in your browser. Watch as the JVM processes your code: objects are created on the heap, methods push onto the call stack, and the garbage collector identifies unreachable objects across Young, Old, and Permanent generations.
Ideal for learning OOP concepts like inheritance, polymorphism, and interfaces visually. Set breakpoints, step through method calls, inspect object state, and understand how Java’s automatic memory management works under the hood. Perfect for Java courses, coding interviews, and everyday development.