Thread: how to check null

Probably not. But what are you actually trying to do? Why do you think you should be avoiding the == operator in this case?

Originally Posted by veens

some times == can't work(like string objects) that's why i wanted to know any other way...

Using == for null is fine, since you're comparing the reference (as Mr.777 already pointed out). If your reference is null, it will be == to null.

Hi,
Only when the left side value may be null then only == show exception so just try to avoid such on your code.

Core java

Originally Posted by mr.miku

Hi,
Only when the left side value may be null then only == show exception so just try to avoid such on your code.

If I'm understanding you correctly, you're saying that this will cause an Exception:

String str = null;
boolean n = (str == null);

...and that's simply not true. Using == to check null is the way to go.

my 0.02

String str = null;
System.out.println(str.equals("hello world")); // NullPointerException
System.out.println("hello world".equals(str)); // outputs false