Decrement Operator

The operator -- is a postfix and a prefix decrement operator. The postfix operator decrements a variable after using its value; the prefix operator increments a variable before using its value.

Expression	Operation	Example	Result
x++	use the value, then add 1	int x = 10; int y; y = x++ ;	x is 11; y is 10
++x	add 1, then use the value	int x = 10; int y; y = ++x ;	x is 11; y is 11
x--	use the value, then subtract 1	int x = 10; int y; y = x-- ;	x is 9; y is 10
--x	subtract 1, then use the value	int x = 10; int y; y = --x ;	x is 9; y is 9

Inspect the following code:

int x = 99;
int y = 10;

y = --x ;

System.out.println("x: " + x + "  y: " + y );