Don't understand this Java answer

Question

When I run this
x = 10;
println(++x + 1);
println(x++ + 1);
println((x));

The answer is

12
12
12

Why isn't the answer for the second line of code (println(x++ + 1) 13? The previous number is 12, so why isn't it 12 + 1?

Answer 1

1) 11+1 //++10 + 1
2) 11+1 //11++ + 1
3) 12 //12

Answer 2

Gaurav your answers are great as always

Answer 3

x++ - postfix incrementation
(first the value of x is returned, then x is incremented with 1)
++x - prefix incrementation (first x is incremented, then x is returned)

1. x = 10,
++x + 1 is equal to:
x = x + 1, then x + 1 = 11 + 1 = 12

2. x = 11,
x++ + 1 is equal to:
x + 1 = 11 + 1 = 12, then x = x + 1

3. x = 12

Answer 4

Thank you Gaurav and Boris. Boris, the details you provided helped a great deal in understanding the process.