how to check null

Hi,

Is there any other way to check null in string,without using == operator

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

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

@veens: There is no way that == doesn't work.
== is a comparison operator that compares the referenced value of object.
What you will be trying to do is comparing the contents, not the referenced value.
So, for comparing the contents you can use equals(), while for comparing referenced value you must use ==

Quote:

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Originally Posted by veens

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

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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

Quote:

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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.

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

Code java:

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

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

my 0.02

Code java:

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

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