Problems with the (for) loop. How does this happen?

Question

Java

Please explain the sequence of this process.

Answer 1

x = 0; y = 0
x = 1; y = 0;                              *
x = 2; y = 0; y = 1;                     *  *
x = 3; y = 0; y = 1; y = 2;            *  *  *
x = 4; y = 0; y = 1; y = 2;  y = 3;  *  *  *  *

*corrected

Answer 2

You would also write by hand ... You take
your code, run it under a debugger, follow it step by step and watch how the values ​​of the variables change and what is displayed on the screen.
And everything will be clear.