Having a hard time getting the logic. Can anyone please explain?

Question

Found this question in a quiz
What is the output of this code?
class A {
int x;
}
class B {
public static void main(String[] args) {
A a1, a2, a3;
a1 = a2 = a3 = new A();
a1.x = 2;
System.out.print(a1.x);
a2.x = 3;
a3.x = 4;
if (a1.x == a3.x)
System.out.print(a2.x);
else
System.out.print(0);
}
}

Answer is 24!

Answer 1

Don't read the output as Twenty-four, but Two and then Four output on the same line. A is an object and a1 = a2 = a3 = new A(); will make all 3 references (a1, a2, a3) point to the exact same object. So any change made from any one of those objects will also change the other two.
a1.x == a3.x will always be true as a1 and a3 point to the same object so the value of x is always the same across them no matter which reference was used to access or change x.

Answer 2

Thanks a lot. That helped