Working Class Java 2-2: Variables, Types, Memory Spaces, How To Use The Java Debugger Stepper Tool 

Java and many other programming languages make use of what are frequently called either pointers or references. Don't worry too much about the names, just focus on how they work.
Ryan discusses references, and how to gain an understanding of what they are by looking at the virtual memory space of a running program (don't worry, it's easier that it might sound).
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