Java conditional checks and assignment

Question

I am looking for a more efficient way to perform the following action, where I am appending the return value of a method to an array. However if the return is null i want to perform another action and not change the array.

Object[] myVal = new Object[10];
Object temp;
temp = myFunction();
if(temp != null) {
    myVal[count++] = temp;
} else {
    System.Exit();
}

Where I want to assign a variable to the return of a method, but provide an 'inline' check to carry out another action if the value returned is null.

Something like:

myVal = (myFunction() != null) ? [output of expression]: System.Exit();

Is there any method like this?

I'm looking to try an avoid creating an instance of the temp Object — BradStevenson
– BradStevenson, Commented Mar 13, 2013 at 21:22

tckmn · Accepted Answer · 2013-03-13 21:04:34Z

6

myVal = myFunction();
if (myVal == null) System.exit(0);

No need for a temp variable.

answered Mar 13, 2013 at 21:04

tckmn

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2 Comments

GriffeyDog Over a year ago

I think the OP wants to avoid the variable assignment when the method returns null. Of course, if he's actually doing System.exit(0) it won't matter.

tckmn Over a year ago

@GriffeyDog "Avoid the assignment?" Doesn't that mean to keep it assigned to null, which he is trying to avoid anyway?

Simon Dorociak · Accepted Answer · 2013-03-13 21:06:37Z

0

Try this:

if ((myVal = myFunction()) == null) System.exit(0);
else // do your work

Note: Usage of ternary operators is not recommended because code becomes hard to read.

answered Mar 13, 2013 at 21:06

Simon Dorociak

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2 Comments

BradStevenson Over a year ago

if myVal was an array that i am adding the return value onto the end of, would this add the null value? i ideally want to check for the value before i would add it onto the end of the array.

Simon Dorociak Over a year ago

Normally use temp instead of myVal...if ((temp = myFunction()) != null) myVal[index] = temp;

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