|
| |
| 2.2.5.The ++ operators may appear before the value (prefix) or after the value (postfix). |
|
|
++x (prefix)
x++ (postfix)
--x (prefix)
x-- (postfix)
Examples of Pre-and Post- Increment and Decrement Operations
Initial Value of x Expression y x
5 y = x++ 5 6
5 y = ++x 6 6
5 y = x-- 5 4
5 y = --x 4 4
When using a prefix expression, the value returned is the value that is calculated after the prefix operator is applied.
When using a postfix expression, the value returned is the value of the expression before the postfix operator is applied.
public class MainClass {
public static void main(String[] argv) {
int x = 10;
int y = ++x; // The value assigned to y is 11
System.out.println(x);
System.out.println(y);
x = 10;
y = x++; // The value assigned to y is 10
System.out.println(x);
System.out.println(y);
x = 10;
y = --x; // The value assigned to y is 9
System.out.println(x);
System.out.println(y);
x = 10;
y = x--; // The value assigned to y is 10
System.out.println(x);
System.out.println(y);
}
}
|
|
11
11
11
10
9
9
9
10 |
|