Java operators can be divided into the following four groups:
arithmetic,
bitwise,
relational,
logical.
Operators are classified as prefix, postfix, and infix.
A prefix operator is a unary operator that precedes its operand, for example -6.
A postfix operator is a unary operator that trails its operand, for example x++.
An infix operator is a binary or ternary operator that is placed between the binary operator's two or the ternary operator's three operands, for example x + 5.