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I need to make an ArrayList of ArrayLists thread safe. I also cannot have the client making changes to the collection. Will the unmodifiable wrapper make it thread safe or do I need two wrappers on the collection?
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This method accepts an object of Set interface and, returns a synchronized (thread-safe) set backed by the specified set. This method accepts an object of the Map interface and, returns a synchronized (thread-safe) sorted map backed by the specified sorted map.
All collection classes (except Vector and Hashtable) in the java. util package are not thread-safe. The only two legacy collections are thread-safe: Vector and Hashtable.
The unmodifiableCollection() method of java. util. Collections class is used to return an unmodifiable view of the specified collection. This method allows modules to provide users with “read-only” access to internal collections.
The collection classes that are thread-safe in Java are Stack, Vector, Properties, Hashtable, etc.
It depends. The wrapper will only prevent changes to the collection it wraps, not to the objects in the collection. If you have an ArrayList of ArrayLists, the global List as well as each of its element Lists need to be wrapped separately, and you may also have to do something for the contents of those lists. Finally, you have to make sure that the original list objects are not changed, since the wrapper only prevents changes through the wrapper reference, not to the original object.
You do NOT need the synchronized wrapper in this case.
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