Learn what a variable is, how to declare it, what types of variables exist, and what scope and modifiers mean in Java, one of the most popular programming languages.

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For example, we might create a variable for a computer game called “health.” ... If you have some familiarity with variables in Java, you might wonder why I left strings off of the list.

Method and variable handles vs. Java reflection. To truly understand MethodHandles and VarHandles—what they do and why they are useful—it’s helpful to know a few things about reflection in Java.