Java Unary Operators

The unary operators require only one operand; they perform various operations such as incrementing/decrementing a value by one, negating an expression, or inverting the value of a boolean.

OperatorDescription
+Unary plus operator; indicates positive value (numbers are positive without this, however)
-Unary minus operator; negates an expression
++Increment operator; increments a value by 1
--Decrement operator; decrements a value by 1
!Logical complement operator; inverts the value of a boolean

The increment/decrement operators can be applied before (prefix) or after (postfix) the operand. The code result++; and ++result; will both end in result being incremented by one. The only difference is that the prefix version (++result) evaluates to the incremented value, whereas the postfix version (result++) evaluates to the original value. If you are just performing a simple

increment/decrement, it doesn't really matter which version you choose. But if you use this operator in part of a larger expression, the one that you choose may make a significant difference.

Screenshots of Prefix Postfix Unary Operator Program

The following program PrePostUnaryOp illustrates the prefix/postfix unary increment operator:



public class PrePostUnaryOp {
    public static void main(String[] args){
        int u = 50;
        u++;
        // using postfix '++' operand which show result from incremented by one. 
        System.out.println(u);
        ++u;			   
        // using prefix  '++'operand which before incremented by one.and after then show result 
        System.out.println(u);
       // using prefix  operand which show result from incremented by one.
        System.out.println(++u);
       // show orignal result 
        System.out.println(u++);
        // using postfix  operand which show result from incremented by one.
        System.out.println(u);
    }
}


  

Simple Java Program Using Unary Operators:



/* Simple Java Program Example how to use Unary Operators  */

public class UnaryOprator {

    public static void main(String[] args) {

        int op = 10;
        // Usingng unary operator '+'
        System.out.println("The Result Is:=" +op);

       op--;
        // Now using '--' unary operator
        System.out.println(+op);

       op++;
        // Now using '++' unary operator
        System.out.println(+op);

        op=-op;
       //Now using '-' unary operator
        System.out.println(+op);

        System.out.println("The Program is  About Unary Operators");
    }
}

  

Download Source code 'Java Unary Operators Program'

Output Here In cmd Window

Java Operators
Arithmetic Operators
Assignment Operator
Bitwise Operators
instanceof Operator
Relational Operators
Unary Operators
Conditional Operators

References : oracle

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