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final class or private constructor

 
Greenhorn
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if i want to create a class that can not be inheritance by another class. wich one is better : (use private constructor or final clas)
class one
{
private one() {}
}
or
final class one
{
one() {}
}
why, we always use use final ? i know that use private can do the same thing
so any body know, what is the advantages if we use choise number one (use private contructor ) ?
 
Desperado
Posts: 3226
5
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"If i want to create a class that can not be inheritance by another class..."
The keyword final for such a class is your answer.
That's what it was invented for. It is more elegant, no matter what... That's because it is the way to DESIGN it.
Look at the java.lang.Math class and try to figure out why it is final. Its constructor is private; and why you would NOT want to have a private constructor in an otherwise final class?
 
Greenhorn
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I think that two methods are all work well
 
Ranch Hand
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Gnome986 and Williamtham
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