线程安全的集合
//make thread-safe list
List MyStrList = Collections.synchronizedList(new ArrayList());
MyStrList.add("123");
MyStrList.add("abc");
//make thread-safe hashset
Set set=Collections.synchronizedSet(new HashSet());
set.add(123);
set.add(456);
//make thread-safe hashmap
Map map=Collections.synchronizedMap(new HashMap());
map.put(1, "thb");
map.put(12, "bill tang");
CopyOnWriteArrayList与Collections.synchronizedList的性能对比
http://blog.csdn.net/zljjava/article/details/48139465