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@@ -36,6 +36,13 @@ import java.util.Queue;
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public class QueuedLinkedHashSet<E> extends LinkedHashSet<E>
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implements Queue<E> {
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+ /**
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+ * A version number for this class. It should be changed whenever the class
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+ * structure is changed (or anything else that would prevent serialized
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+ * objects being unserialized with the new class).
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+ */
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+ private static final long serialVersionUID = 1;
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+
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/** {@inheritDoc} */
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@Override
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public boolean offer(final E e) {
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