null Archives - Page 6 of 6

What is a NullReferenceException, and how do I fix it?

This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. ...

April 10, 2022
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How can I determine if a variable is ‘undefined’ or ‘null’?

How do I determine if variable is undefined or null? My code is as follows: var EmpName = $("div#esd-names div#name").attr('class'); if(EmpName == 'undefined'){ ...

April 10, 2022
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Is there a standard function to check for null, undefined, or blank variables in JavaScript?

Is there a universal JavaScript function that checks that a variable has a value and ensures that it’s not undefined or null? I’ve ...

April 10, 2022
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How can I check for an empty/undefined/null string in JavaScript?

I saw this question, but I didn’t see a JavaScript specific example. Is there a simple string.Empty available in JavaScript, or is it ...

April 9, 2022
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Avoiding NullPointerException in Java

I use object != null a lot to avoid NullPointerException. What is an alternative to: if (someobject != null) { someobject.doCalc(); } 6 ...

April 9, 2022
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What is null in Java?

Is null an instance of anything? No, there is no type which null is an instanceof. 15.20.2 Type Comparison Operator instanceof RelationalExpression: RelationalExpression instanceof ReferenceType At run ...

April 8, 2022
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Understanding the difference between null and ‘\u000’ in Java

The language specification is where null is defined, and it says There is also a special null type, the type of the expression ...

April 7, 2022
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How to check if my string is equal to null?

April 6, 2022
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Returning null in a method whose signature says return int?

int is a primitive, null is not a value that it can take on. You could change the method return type to return java.lang.Integer and then ...

April 5, 2022
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How to check if object is null or not except == null

The easiest way to check is entity == null. There is no shorter way to do that. Note that there is a method for ...

April 4, 2022
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