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method argument as final

Posted on 2016-08-14
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Last Modified: 2016-08-14
Hi,

When do we need to declare method argument as final say as below

void addPerson(final Employee theEmployee) {
......
.....

}

please advise
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Question by:gudii9
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dpearson earned 2000 total points
ID: 41755845
>> When do we need to declare method argument as final say as below

You almost never have to declare arguments as final, but some people consider it good practice and it may be adopted as a coding standard by some companies.

The reason to do this is that "final" makes sure the parameter cannot be modified within the method, which keeps the logic simpler.

void addPerson(final Employee theEmployee) {
    ... stuff before
    process(theEmployee) ; // guaranteed that this is the employee that was passed in
}

Open in new window


Without final the value could change:
void addPerson(Employee theEmployee) {
    ... stuff before
    process(theEmployee) ; // maybe modified along the way
}

Open in new window


E.g. Here's how not making it final allows parameter to be changed:
void addPerson(Employee theEmployee) {
    ... stuff before
    theEmployee = anotherEmployee; 
    ... more stuff
    process(theEmployee) ; // may not be what was intended
}

Open in new window


So it's probably a good idea to usually add "final" to parameters to methods by default.
So why don't people do this more often?  Because it's extra typing.

Doug
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