Question on a JAVA challenge regarding increment and if-statement

Question

Why is 'b' not changed when 'a' did in the codes below?
Also, why is there "" between a+b ?
int a = 2, b= 3;
if(a++ > b && ++b > 0) {
System.out.println(1);
} else {
System.out.println(a + "" + b);
}

Answer 1

&& returns only true when both conditions are true.
a++ > b returns false -> the rest is ignored

a + b -> integer
a + " " + b -> string

Answer 2

But there is a problem....a was treated like integer and b is treated like string....... That cant be posible because a++ raise and ++b didn it