There are many interesting facts with respect to increment and decrement operators in Java. We will discuss a few of them with examples −
The increment and decrement operators can’t be used with the ‘final’ variables. This is due to the fact that variables associated with ‘final’ keyword can’t be changed −
Example
public class Demo{ public static void main(String[] args){ final int my_val = 34; int my_val_2 = ++my_val; System.out.println("The value is :"); System.out.println(my_val_2); } }
Output
/Demo.java:6: error: cannot assign a value to final variable my_val int my_val_2 = ++my_val; ^ 1 error
Nesting the ‘++’ and ‘- -‘ operator isn’t possible or rather not allowed.
Example
public class Demo{ public static void main(String[] args){ int my_val_1 = 99; int my_val_2 = ++(++my_val_1); System.out.println("The value is "); System.out.println(my_val_2); } }
Output
/Demo.java:6: error: unexpected type int my_val_2 = ++(++my_val_1); ^ required: variable found: value 1 error