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image hosting There are two of these, ++ and -- and they work like this.//Count to tenclass CountToTen { public static void main (String args[]) { int i; for (i=1; i <=10; i++) { System.out.println(i); } System.out.

image hosting println("All done!");}} //Count to ten??class BuggyCountToTen { public static void main (String args[]) { int i; for (i=1; i <=10; i--) { System.out.println(i); } System.out.println("All done!"); }} When we write i++ we're using shorthand for i = i + 1.

image hosting When we say i-- we're using shorthand fori = 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. They also allow the compiler to be smarter about certain optimizations on some CPU architectures, but mainly they make code easier to write and read.However what do you do when you want to increment not by one but by two? or three? or fifteen? We could of course write i = i + 15 but this happens frequently enough that there's another short hand for the general add and assign operation, +=. We would normally write this as i += 15.

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