Скачать или смотреть Java Integers - int long byte and short Integer Variables - Java Tutorial - Appficial

byte, short, int, and long are primitive data types for declaring integers
int is the most commonly used of the four. Variables declared as integers can hold whole numbers such as -2, -7, 52 and 187. Integer data types cannot hold floating point numbers (numbers with a decimal point). Integers embedded into Java source code are called integer literals.

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