Incrementing and decrementing variables (prefix vs suffix)

Question

x++ uses x’s value in the next place it’s used THEN increments it right? For example:
x=2;
System.out.println(x++);
System.out.println(++x);
//Outputs 2 and 4

But in this example:
int x = 1;
do {
System.out.println(x);
x++;
} while(x < 3);
I do not understand why it doesn’t print 1, 2 and 3. (It prints 1 and 2). Here is how I think:
int x = 1;
do {
System.out.println(x); //print 1
x++;
} while(x < 3); // First time: is x (1) < 3? Yes so it does it again. After it has checked, x = 2.

Answer 1

I was just wondering why it increments before testing.

Answer 2

@Martin Taylor. Idk if the tagging works, but I’ll try :P