Unary operators are used with only one operand. For example, ++ is a unary operator that increases the value of a variable by 1. That is, ++15 will return 16.
Different types of unary operators are:
|
Operator |
Meaning |
|
+ |
Unary plus: not necessary to use since numbers are positive without using it |
|
- |
Unary minus: inverts the sign of an expression |
|
++ |
Increment operator: increments value by 1 |
|
-- |
Decrement operator: decrements value by 1 |
|
! |
Logical complement operator: inverts the value of a boolean |
Increment and Decrement Operators
Java also provides increment and decrement operators: ++ and -- respectively. ++ increases the value of the operand by 1, while -- decrease it by 1. For example,
int num = 15;
// increase num by 1
++num;
Here, the value of num gets increased to 16 from its initial value of 15.
Example 5: Increment and Decrement Operators
class Main {
public static void main(String[] args) {
// declare variables
int a = 12, b = 12;
int result1, result2;
// original value
System.out.println("Value of a: " + a);
// increment operator
result1 = ++a;
System.out.println("After increment: " + result1);
System.out.println("Value of b: " + b);
// decrement operator
result2 = --b;
System.out.println("After decrement: " + result2);
}
}
