comparing an object with null

[Asad Khan]

I have the following method in a class 'foo'.

public boolean equals(Object o) {
if (!(o.equals(nul l))) {
// do some stuff
}
}

The problem I am having is that, if the object that is passed in is
instanceof foo, then it recursively calls the equals method, and I get a
nullpointer exception. So how can I compare if the object that is being
passed in is null or not?

Thanks.

[Glen Herrmannsfeldt]

"Asad Khan" <uo**********@y ahoo.com> wrote in message
news:zZ******** ************@ne ws01.bloor.is.n et.cable.rogers .com...

I have the following method in a class 'foo'.

public boolean equals(Object o) {
if (!(o.equals(nul l))) {
// do some stuff
}
}

The problem I am having is that, if the object that is passed in is
instanceof foo, then it recursively calls the equals method, and I get a
nullpointer exception. So how can I compare if the object that is being
passed in is null or not?

Remember, objects are not passed, object references are passed.

-- glen

[hiwa]

"Asad Khan" <uo**********@y ahoo.com> wrote in message news:<zZ******* *************@n ews01.bloor.is. net.cable.roger s.com>...

I have the following method in a class 'foo'.

public boolean equals(Object o) {
if (!(o.equals(nul l))) {
// do some stuff
}
}

The problem I am having is that, if the object that is passed in is
instanceof foo, then it recursively calls the equals method, and I get a
nullpointer exception. So how can I compare if the object that is being
passed in is null or not?

Thanks.

public boolean equals(Object o) {
if (!(o == null)){ //null is not an Object, that is 'none-object'
place holder refrence ... sole pointer in Java!
// do some stuff
}
else[
return false;
}
}