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There are 2 Increment or decrement operators -> ++ and --. These two operators are unique in that they can be written both before the operand they are applied to, called prefix increment/decrement, or after, called postfix increment/decrement. The meaning is different in each case.

Example

x = 1;
y = ++x;
System.out.println(y);

prints 2, but

x = 1;
y = x++;
System.out.println(y);

prints 1

Source Code

//Count to ten

class UptoTen {

public static void main (String args[]) {
int i;
for (i=1; i <=10; i++) {
System.out.println(i);
}
}

}
When we write i++ we're using shorthand for i = i + 1. When we say i-- we're using shorthand for i = i - 1. Adding and subtracting one from a number are such common operations that these special increment and decrement operators have been added to the language. T

There's another short hand for the general add and assign operation, +=. We would normally write this as i += 15. Thus if we wanted to count from 0 to 20 by two's we'd write:

Source Code

class CountToTwenty {

public static void main (String args[]) {
int i;
for (i=0; i <=20; i += 2) { //Note Increment Operator by 2
System.out.println(i);
}

} //main ends here

}
As you might guess there is a corresponding -= operator. If we wanted to count down from twenty to zero by twos we could write: -=

class CountToZero {

public static void main (String args[]) {
int i;
for (i=20; i >= 0; i -= 2) { //Note Decrement Operator by 2
System.out.println(i);
}
}

}