java.util.Collections class provides static methods to return synchroni collection backed by the specified collection. Following are the methods provided by Collections class:

• Collections.synchronizedCollection(Collection<T> c)
• Collections.synchronizedList(List<T> list)
• Collections.synchronizedMap(Map<K,V> m)
• Collections.synchronizedSet(Set<T> s)
• Collections.synchronizedSortedMap(SortedMap<K,V> m)
• Collections.synchronizedSortedSet(SortedSet<T> s)

For example, to create synchronized list:

List<String> list = new ArrayList();
List<String> synchronizedList = Collections.synchronizedList(list);