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Revision 1.16 by dl, Sun Feb 8 15:35:10 2004 UTC vs.
Revision 1.17 by dl, Thu Dec 30 13:04:46 2004 UTC

# Line 61 | Line 61 | java.util.concurrent.SynchronousQueue},
61   java.util.concurrent.PriorityBlockingQueue}, and {@link
62   java.util.concurrent.DelayQueue}. The different classes cover the most
63   common usage contexts for producer-consumer, messaging, parallel
64 < tasking, and related concurrent designs.
64 > tasking, and related concurrent designs. The {@link
65 > java.util.concurrent.BlockingDeque} interface extends
66 > <tt>BlockingQueue</tt> to support both FIFO and LIFO (stack-based)
67 > operations. Class {@link java.util.concurrent.LinkedBlockingDeque}
68 > provides an implementation.
69  
70  
71   <h2>Timing</h2>
# Line 91 | Line 95 | in several pipeline designs.
95  
96   <h2>Concurrent Collections</h2>
97  
98 < Besides Queues, this package supplies a few Collection implementations
99 < designed for use in multithreaded contexts: {@link
100 < java.util.concurrent.ConcurrentHashMap}, {@link
101 < java.util.concurrent.CopyOnWriteArrayList}, and {@link
102 < java.util.concurrent.CopyOnWriteArraySet}.
98 > Besides Queues, this package supplies Collection implementations
99 > designed for use in multithreaded contexts:
100 > {@link java.util.concurrent.ConcurrentHashMap},
101 > {@link java.util.concurrent.ConcurrentSkipListMap},
102 > {@link java.util.concurrent.ConcurrentSkipListSet},
103 > {@link java.util.concurrent.CopyOnWriteArrayList}, and
104 > {@link java.util.concurrent.CopyOnWriteArraySet}.
105 > When many threads are expected to access a given collection,
106 > a <tt>ConcurrentHashMap</tt> is normally preferable to
107 > a synchronized <tt>HashMap</tt>, and a
108 > <tt>ConcurrentSkipListMap</tt> is normally preferable
109 > to a synchronized <tt>TreeMap</tt>. A
110 > <tt>CopyOnWriteArrayList</tt> is preferable to
111 > a synchronized <tt>ArrayList</tt> when the expected number of reads
112 > and traversals greatly outnumber the number of updates to a list.
113  
114   <p>The "Concurrent" prefix used with some classes in this package is a
115   shorthand indicating several differences from similar "synchronized"

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