Question

Hi I would like to know diff between the above comparisons?

I am getting null pointer exception when I check object.getItems() == null.
But if I change it to null == object.getItems(), it workes fine.

I did look into this what is the difference between null != object and object!=null
But I didnt get satisfactory answer.

Answer 1

^{(Similar question: Which is more effective: if (null == variable) or if (variable == null)?)}

Difference between null==object and object==null

There is no semantical difference.

object.getItems() == null and null == object.getItems() are equivalent.

Perhaps you’re mixing it up with the fact that

nonNullObj.equals(obj)

and

obj.equals(nonNullObj)

can make a difference (since the second alternative could result in a NPE in case the callee is null).