Eclipse Community Forums: Java Development Tools (JDT) » Should there be a warning/error here

Home

Home » Language IDEs » Java Development Tools (JDT) » Should there be a warning/error here

Should there be a warning/error here [message #1163887]

Thu, 31 October 2013 05:33

Eclipse User

Just stumbled upon this code:

    public boolean test() {
        return Math.random() > 0.5 ? null : true;
    }

There is no warning/error. I guess the compiler will do something like this:

    public boolean test() {
        return Math.random() > 0.5 ? ((Boolean)null).booleanValue() : true;
    }

Is this expected behavior?

Re: Should there be a warning/error here [message #1165213 is a reply to message #1163887]

Fri, 01 November 2013 01:56

Eclipse User

No there is neither error nor warning because

return Math.random() < 0.5 ? null : true;

is returning false hence you have giving it true in your code.
It can be understood like this

if(Math.random() < 0.5)
{
return null;
}
else
{
return true;
}

Here with your code else part is being executed as the condition is not satisfied but if the condition is satisfied the code will give you java.lang.NullPointerException

TechKnow Heights

[Updated on: Fri, 01 November 2013 01:58] by Moderator

Previous Topic:	simple batch program
Next Topic:	Batch Sample

Goto Forum:

-=] Back to Top [=-

Current Time: Sat Jul 12 11:28:18 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter