Constant classes and performance

Hi,

I recently noticed that in a GWT project, constant classes are being
defined like this:

public class Constants
{
private final Integer foo = 1;

public Integer getFoo()
{
return foo;
}
}

instead of the good ol':

public class Constants
{
public static final Integer FOO = 1;
}

When I asked, someone said this is a GWT-specific optimization. Is
this correct? If so, what optimization is that? Why is the first
version better from a performance point of view?

Thanks,
Behi

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