I recently saw a method like
public void display(final String toDisplay){
}
I want to know the purpose of final keyword in method parameter.
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Wht exactly u didn't understand? bcoz if its again explained, it might not be wht u want. – Lokesh Apr 01 '14 at 03:49
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I mean you can't get any clearer than that. – Sotirios Delimanolis Apr 01 '14 at 03:49
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4so you can have a Fantasy class and declare it as final Fantasy – Mc Kevin Apr 01 '14 at 04:00
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@Lokesh The language that the answers I went had was very tough to understand. – Nick Div Apr 01 '14 at 17:09
4 Answers
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final variables means you can not change the value.
For example final int x=9; and after that if you change it with x=6; then it will not compile.
So in your case
public void display(final String toDisplay){
}
In this method you are allowing a String argument and after that within that method if you try to change then it will not compile.
Kevin Panko
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SpringLearner
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what is the point of this? any "changes" would be to the locally scoped reference, and not to the actual object, so clients cannot possibly see any difference, right? – sara May 01 '16 at 16:15
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suppose your method doing complex calculation so by accidentally you may not change the value of toDisplay variable this is the main reason I can say.
Sanjay Rabari
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It is to make sure that the implementation will not change the reference.
Vincent Cantin
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It simply tells the compiler that this method can not change the thing that parameter points to.
deiga
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