Definition:
Unary Operators are the operators that are performed on a single operand.
- – Unary Minus Operator: Negative operator means the value of the variable is less than zero.
- + Unary Plus Operator: Positive operator is not required for positive numbers as positive operator is implicitly (system given) given to numbers.
- – – Unary DecrementOperator: Decrements a value by 1
- ++ Unary Increment Operator: Increments a value by 1
Syntax:
Let’s look at the syntax of the Unary Operators.
int a = -100;
boolean isPositive = a > 0; // verify if a is positive
boolean isNegative = a < 0; // verify if a is negative
System.out.println(a + " is positive number: " + isPositive);
// Output: -100 is positive number: false
System.out.println(a + " is negative number: " + isNegative);
// Output: -100 is negative number: true
int b = -100 - 20; // operation: -100 -20 = -120
System.out.println(b);
// Output: -120
// Please see some more examples below:
int c = 10 - -20; // returns a positive value of 30
// operation: 10 + 20 = 30
int d = -10 * 4; // d = -40
int e = 10 * -4; // e = -40
int f = -10 * -4;// f = 40
int x = 100;
++x; // increases the value by 1, 100 + 1 = 101
System.out.println(x);
//by placing ++ before variable 'x' we will get number 101
int y = 100;
--y; // decreases the value by 1, 100 -1 = 99;
System.out.println(y);
// operation: by placing -- before variable 'y' we will get number 99
int z = 100;
System.out.println(--z); // 99
int x2 = 100;
System.out.println(++x2); // 101
int a2 = 100;
System.out.println(a2++); // 100
System.out.println( a2 );
int b2 = 100;
System.out.println(b2--); // 100
System.out.println(b2); // 99Learn the following topics before learning Unary Operators.