Java Tutorial/Operators/Increment Decrement Operators

Increment and Decrement: Demonstrate ++.

   <source lang="java">

public class MainClass {

 public static void main(String args[]) {
   int a = 1;
   int b = 2;
   int c;
   int d;
   c = ++b;
   d = a++;
   c++;
   System.out.println("a = " + a);
   System.out.println("b = " + b);
   System.out.println("c = " + c);
   System.out.println("d = " + d);
 }

}</source>

a = 2
b = 3
c = 4
d = 1

The increment and decrement operators

1. add an integer variable by one.
2. increment operator: two successive plus signs, ++.
3. decrement operator: --.

   <source lang="java">

public class MainClass {

 public static void main(String[] argv) {
   int count = 10;
   ++count;      // Add 1 to count
   --count;      // Subtract 1 from count
   
   System.out.println(count);
 }

}</source>

10

The prefix form and the postfix form

   <source lang="java">

public class MainClass {

 public static void main(String[] args) {
   int numA = 5;
   int numB = 10;
   int numC = 0;
   numC = ++numA + numB;
   System.out.println(numA);
   System.out.println(numC);
 }

}</source>

4
14

Using ++ and -- with floating-point variables

   <source lang="java">

public class MainClass{

 public static void main(String[] arg){
    double a = 12.12;
    
    System.out.println( a-- );
    System.out.println( a++ );
    System.out.println( --a );
    System.out.println( ++a );
 }

}</source>

12.12
11.12
11.12
12.12

Using the increment and decrement operators in an expression

   <source lang="java">

public class MainClass {

 public static void main(String[] args) {
   int numA = 5;
   int numB = 10;
   int numC = 0;
   numC = ++numA + numB;
   
   System.out.println(numA);
   System.out.println(numC);
 }

}</source>

6
16