As you know by now, the commonly used collection classes, such as java.util.ArrayList, are not synchronized. However, if there’s a chance that two threads could be altering a collection concurrently, you can generate a synchronized collection from it using the synchronizedCollection() method. Similar to the read-only methods, the thread-safe APIs let you generate a synchronized collection, list, set, or map. For instance, this is how you can generate a synchronized map from a HashMap:
Map map = Collections.synchronizedMap(new HashMap()); map.put(
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