Variables are used for storing data in memory during program execution.
Data Types
Depending on what data you need to store, there are several kinds of data types. Java has eight types built into the language, called primitives
. The integer (whole number) types are byte, short, int, and long. The float and double types represent floating-point numbers (real numbers). The char type holds a Unicode character, and the boolean type contains either a true or false value. Except for these primitive types, every other type in Java is represented by a class, an interface, or an array.
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