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Message:
Immutables and Multi-valued Returns
Posted by Bill Venners on April 26, 2000 at 1:58 PM
> Hello Bill, > thanks for answering my question
> > If there is no solution: Why may one make something in Java
> > with arrays, what is forbidden with normal objects? > Your answer was:
> --snip
> > Class Integer happens to be immutable. Once it is created with
> > a value, it can't change. Arrays are always mutable.
> --snip
> Is there for it a simple reason? I cannot believe that it is so difficult to implement a simple algorithm calculating two or more integers. 1. Immutables are by definition thread-safe.
2. Immutables needn't be cloned before being passed, because
the method to which they are passed can't change their state. If you want to do a multi-valued return, you'll have to return
an object that contains the values. For an example, search
for "Multi" in the following seminar handout: http://www.artima.com/javaseminars/modules/DesWithObjects/index.html This page also discusses immutables. bv
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