CODEWITHSUNDEEP
javaperformance
dasdasd
dasdasd

Reputation: 2031

Effective way to test if object is null

What is better use in order to check if object is null.

To check if the object is null or to set a flag for it. By saying better im looking for performance (faster and safer).

public class A
{

Object test;
boolean isTestObjectSet;

public A(Object test)
{
this.test = test;
isTestObjectSet = true;
}

public A()
{

}

public void doSomething()
{

if(test != null)
//do something

//VS

if(isTestObjectSet)
//do something


}
}

Upvotes: 0

Views: 68

Answers (2)

arshajii
arshajii

Reputation: 129517

Using isTestObjectSet is just making things more complicated than they need to be. Just use test != null: it better conveys your intention and doesn't force you to keep this isTestObjectSet variable in-sync with whether or not test is set. There is absolutely no performance difference between the two variants.

Upvotes: 3

dreamsComeTrue
dreamsComeTrue

Reputation: 116

In my opinion - explicit checks (comparing to 'null') is faster, in terms not cluttering your code with many intermediary boolean variables. Safer? Both of the checks are boolean checks, so it is always 'true'/'false' comparison.

Upvotes: 2

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