Newer version: try the Java visualizer on pythontutor.com, which supports more collection classes, keyboard input with Scanner, faster performance, and Python, C, C++, and JavaScript.

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To share this visualization, click the 'Generate URL' button above and share that URL. To report a bug, paste the URL along with a brief error description in an email addressed to daveagp@gmail.com

Based on Online Python Tutor, © 2010-2013 Philip Guo all rights reserved. Java version by David Pritchard, Will Gwozdz. Source code: for this version's backend; the frontend and installation instructions.