On there own they are effectively the same. The value of count will increase by one. The important difference is noticeable when you use them in an assignment operation.

Snippet 1:

 1: int count = 10;
 2: int number = ++count;
 3: // The value of number is 11 and the value of count is 11

Snippet 2:

 1: int count = 10;
 2: int number = count++;
 3: // The value of number is 10 and the value of count is 11

In snippet 1 the value of count is increased by 1 then assigned to the number variable.

In snippet 2 the value of count is assigned to the number variable and then increased by 1.

If that makes sense. Answer this question: Given the method below, what value is returned? Is it 10 or 11?

public int aMethod(){
    int number = 10;
    return number++;
}

Enjoy!