StackOverflow2013

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16804978
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0
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2013-05-29T03:27:13.157
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0
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2013-05-29T03:27:13.157
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471955
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1963806
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2
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2
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text
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<p>This class does the job using composition instead of inheritance (other answers here) which removes the possibility of certain side-effects (as covered by Josh Bloch in Essential Java). Trimming of the underlying LinkedList occurs on the methods add,addAll and offer.</p> <pre><code>import java.util.Collection; import java.util.Iterator; import java.util.LinkedList; import java.util.Queue; public class LimitedQueue<T> implements Queue<T>, Iterable<T> { private final int limit; private final LinkedList<T> list = new LinkedList<T>(); public LimitedQueue(int limit) { this.limit = limit; } private boolean trim() { boolean changed = list.size() > limit; while (list.size() > limit) { list.remove(); } return changed; } @Override public boolean add(T o) { boolean changed = list.add(o); boolean trimmed = trim(); return changed || trimmed; } @Override public int size() { return list.size(); } @Override public boolean isEmpty() { return list.isEmpty(); } @Override public boolean contains(Object o) { return list.contains(o); } @Override public Iterator<T> iterator() { return list.iterator(); } @Override public Object[] toArray() { return list.toArray(); } @Override public <T> T[] toArray(T[] a) { return list.toArray(a); } @Override public boolean remove(Object o) { return list.remove(o); } @Override public boolean containsAll(Collection<?> c) { return list.containsAll(c); } @Override public boolean addAll(Collection<? extends T> c) { boolean changed = list.addAll(c); boolean trimmed = trim(); return changed || trimmed; } @Override public boolean removeAll(Collection<?> c) { return list.removeAll(c); } @Override public boolean retainAll(Collection<?> c) { return list.retainAll(c); } @Override public void clear() { list.clear(); } @Override public boolean offer(T e) { boolean changed = list.offer(e); boolean trimmed = trim(); return changed || trimmed; } @Override public T remove() { return list.remove(); } @Override public T poll() { return list.poll(); } @Override public T element() { return list.element(); } @Override public T peek() { return list.peek(); } } </code></pre>
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1. This table or related slice is empty.
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1. POIs there a fixed sized queue which removes excessive elements?
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1. PTAnswer
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1. USDave Moten
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