Unary operators take only a single operand. : Unary Operators « Operators « SCJP

Java provides seven unary operators:

The increment and decrement operators: ++ and --
The unary plus and minus operators: + and -
The bitwise inversion operator: ~
The boolean complement operator: !
The cast: ()


public class MainClass{
    public static void main(){
      //The ++ and -- operators modify the value of an expression by adding or subtracting 1.
      double d=0.12345D;
      d++;
      System.out.println(d);
    }
}

1.12345

2.2.Unary Operators
	2.2.1.	Unary operators take only a single operand.
	2.2.2.	The unary operators are used to increment, decrement, or change the sign of a value.
	2.2.3.	Increment and Decrement
	2.2.4.	+ and - operators are applied to a value of byte, char, and short types, the value is converted to an int.
	2.2.5.	The ++ operators may appear before the value (prefix) or after the value (postfix).
	2.2.6.	preincrement or pre-decrement, post-increment or post-decrement
	2.2.7.	mixing the increment and decrement operators with other operators
	2.2.8.	increment or decrement operators on a final variable.