Why does the output of this program are 4,2,4: why does b stays the same and a&c change together.

class X {

public int value;

}

public class Pooh {

public static void bah(X d, X e) {

X f = d;

f.value = f.value+1;

X g = new X();

g.value = e.value+1;

e = g;

}

public static void main(String[] args) {

X a = new X();

a.value = 1;

X b = new X();

b.value = 2;

X c = a;

c.value = 3;

bah(a,b);

System.out.println(a.value + ", " + b.value +

", " + c.value);

}

}