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    <p>Some comments (not necessarily problems):</p> <ol> <li>The Date class is itself mutable so you are correctly copying it to protect immutability, but personally I prefer to convert to long in the constructor and return a new Date(longValue) in the getter.</li> <li>Both your getWhateverInstance() methods return DateBean which will necessitate casting, it might be an idea to change the interface to return the specific type instead.</li> <li>Having said all that I would be inclined to just have two classes one mutable and one immutable, sharing a common (i.e. get only) interface if appropriate. If you think there will be a lot of conversion back and forth then add a copy constructor to both classes.</li> <li>I prefer immutable classes to declare fields as <strong>final</strong> to make the compiler enforce immutability as well.</li> </ol> <p>e.g.</p> <pre><code>public interface DateBean { public Date getDate(); } public class ImmutableDate implements DateBean { private final long date; ImmutableDate(long date) { this.date = date; } ImmutableDate(Date date) { this(date.getTime()); } ImmutableDate(DateBean bean) { this(bean.getDate()); } public Date getDate() { return new Date(date); } } public class MutableDate implements DateBean { private long date; MutableDate() {} MutableDate(long date) { this.date = date; } MutableDate(Date date) { this(date.getTime()); } MutableDate(DateBean bean) { this(bean.getDate()); } public Date getDate() { return new Date(date); } public void setDate(Date date) { this.date = date.getTime(); } } </code></pre>
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    1. POImmutable beans in Java
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    1. USMichael Rutherfurd
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    1. COThanks for your comments. I agree that the copy constructor is a significant improvement over the interface factory methods. The note on final members is well taken. Cheers.
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      1. USFrancis Stephens
 

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