Unary Operators

Java From Beginner To Advanced

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Unary Operators

Unary operators perform operations on a single operand. They can modify the operand's value or state directly. In Java, unary operators are used to increment or decrement numeric values, change the sign of a number, or invert a boolean value.

Unary Operators

Operator	Description	Example
`++`	Increment operator; increases an integer by 1	`a++` or `++a`
`--`	Decrement operator; decreases an integer by 1	`a--` or `--a`
`+`	Unary plus; indicates a positive value (usually redundant)	`+a`
`-`	Unary minus; negates the value of an expression	`-a`
`!`	Logical complement; inverts the boolean value	`!flag`

Example 1: Using Post-Increment and Pre-Increment Operators

Below is an example that demonstrates the difference between post-increment and pre-increment operators.

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Explanation:

In int postIncrement = a++;, the original value of a (which is 5) is assigned to postIncrement before a is incremented to 6.
In int preIncrement = ++a;, a is incremented first (from 6 to 7) and then the updated value is assigned to preIncrement.

Example 2: Using Unary Minus and Logical Complement Operators

Below is an example that demonstrates how to use the unary minus to negate a number and the logical complement operator to invert a boolean value.

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Explanation:

int negatedNum = -num; uses the unary minus to change the sign of num, turning 10 into -10.
boolean invertedFlag = !flag; applies the logical complement, converting false to true.

These examples illustrate how unary operators modify individual operands. Experiment with these operators to observe how they affect the values during runtime.

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