Best way to check for null values in Java?

Question

Before calling a function of an object, I need to check if the object is null, to avoid throwing a NullPointerException.

What is the best way to go abou

Answer 1

If at all you going to check with double equal "==" then check null with object ref like

if(null == obj) 

instead of

if(obj == null)

because if you mistype single equal if(obj = null) it will return true (assigning object returns success (which is 'true' in value).