Garbage collector

[Ash sav]

In the following code, which is the earliest statement, where the object originally held in e, may be garbage collected:
public class Test {
public static void main (String args []) {
Employee e = new Employee("Bob", 48);
e.calculatePay();
System.out.println(e.printDetails());
e = null;
e = new Employee("Denise", 36);
e.calculatePay();
System.out.println(e.printDetails());
}
}

Line 10
Line 11
Line 7
Line 8
Never
Answer is line7 but I don't understand why? Can somebody explain me?
Thanks,
Ash

[sai challa]

At line 3 ,the Employee object 'e' is assigned a reference to the object created as new Employee("Bob",48);
At line 6 e is assigned a null reference ,it no longer refers to the object it was earlier referring to.
At line 7 it is assigned a reference to a new Employee Object("Denise",36).
There are no more references to the earlier Employee object ("Bob",48). Hence it may be garbage collected