Скачать или смотреть Java Logical Operators - AND && - OR || - NOT ! - Java Boolean Expressions - Learn Java - Appficial

A logical operator allows you to combine expressions into one bigger expression. Each operator involves two expressions a and be below.

a && b (a and b)
a || b (a or b)
!a (not a)

Use parentheses to make reading these expressions easier, and to make the order of evaluation explicit

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