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Differentiate between the prefix and postfix forms of the ++ operator in java?
Java provides two operators namely ++ and --, to increment and decrement values by 1 respectively.
There are two variants of these operators −
Pre-increment/decrement − This form, increments/decrements the value first, and then performs the specified operation.
Example
In the following example, the initial value of the variable i is 5. We are printing the incremented value of it using the pre increment operator.
Since we are using the pre increment operator, the value of i is incremented then printed.
public class ForLoopExample { public static void main(String args[]) { int i = 5; System.out.println(++i); System.out.println(i); } }
Output
6
Post-increment/decrement − This form, performs the specified operation first, and then increments/decrements the value.
Example
In the following example, the initial value of the variable i is 5. We are printing the incremented value of it using the post increment operator and, we are printing the i value again.
Since we are using the post increment operator, the value of i is printed and then incremented.
public class ForLoopExample { public static void main(String args[]) { int i = 5; System.out.println(i++); System.out.println(i); } }
Output
5 6
Example
public class ForLoopExample { public static void main(String args[]) { int i = 5; System.out.println(i--); System.out.println(i); int j =5; System.out.println(--j); } }
Output
5 4 4