What are numeric promotions?

Numeric promotions are used to convert the operands in a numeric expression to a common type before an operation is performed between the operands. Numeric promotion is a property of the specific definitions of the built-in operations and not a Java language feature. It is applied to the operands of an arithmetic operator. The two types of numeric promotions are as follows:

1. Unary numeric promotion: The unary numeric promotion takes place in accordance with the following rules:
   1. If the operand is one of the following types: byte, short, or char, unary numeric promotion promotes it to a value of type int.
   2. Otherwise, no promotion takes place.
2. Binary numeric promotion: The binary numeric promotion takes place in accordance with the following rules:
   1. If one of the two operands in a numeric expression is a primitive type double value, the other is promoted to a double value.
   2. Otherwise, if one of the two operands in a numeric expression is a primitive type float value, the other is promoted to a float value.
   3. Otherwise, if one of the two operands in a numeric expression is a primitive type long value, the other is promoted to a long value.
   4. Otherwise, both operands are promoted to int values.

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