Unary Operators in Java

Last Updated: 28 May, 2022

What is Operator in Java?

Operators are special symbols that performs the specified operations. Each operator is responsible to perform some specific operation on variables or values and return a result. The operators are classified and listed according to precedence order.

Java supports the following types of operators:

1. Arithmetic Operator
2. Assignment Operator
3. Bitwise Operator
4. Logical Operator
5. Relational Operator
6. Ternary Operator
7. Unary Operator

What is Unary Operator in Java?

In Java, Unary operators work with only one operand, It is used to perform operations like increment, decrement, negation, etc.

Let's breifly understand Unary Operators by given table

Example 1 : Unary Plus, Minus and Logical Complement Operator

public class UnaryOperatorsExample1 { public static void main(String[] args) { // Unary Plus Operator int num = +10; System.out.println("num = " + num); // Unary Minus Operator num = -num; System.out.println("num = " + num); boolean flag = false; System.out.println("flag = " + flag); // Logical Component Operator System.out.println("flag = " + !flag); } }

Output

num = 10
num = -10
flag = false
flag = true

Example 2 : Increment Operator and Decrement Operator

public class UnaryOperatorsExample2 { public static void main(String[] args) { // Pre-Increment Operator int x = 5; int y = ++x; System.out.println("x - " + x); System.out.println("y - " + y); // Post-Increment Operator int a = 10; int b = a++; System.out.println("a - " + a); System.out.println("b - " + b); // Pre-Decrement Operator y = --x; System.out.println("x - " + x); System.out.println("y - " + y); // Post-Decrement Operator b = a--; System.out.println("a - " + a); System.out.println("b - " + b); } }

Output

x - 6
y - 6
a - 11
b - 10
x - 5
y - 5
a - 10
b - 11