Collection Interface Bulk Operations in Java

Bulk operations perform an operation on an entire Collection. You could implement these shorthand operations using the basic operations, though in most cases such implementations would be less efficient. The following are the bulk operations:

➯containsAll — returns true if the target Collection contains all of the elements in the specified Collection.

➯addAll — adds all of the elements in the specified Collection to the target Collection.

➯removeAll — removes from the target Collection all of its elements that are also contained in the specified Collection.

➯retainAll — removes from the target Collection all its elements that are not also contained in the specified Collection. That is, it retains only those elements in the target Collection that are also contained in the specified Collection.

➯clear — removes all elements from the Collection.

The addAll, removeAll, and retainAll methods all return true if the target Collection was modified in the process of executing the operation.

As a simple example of the power of bulk operations, consider the following idiom to remove all instances of a specified element, e, from a Collection, c.


c.removeAll(Collections.singleton(e));

   
More specifically, suppose you want to remove all of the null elements from a Collection.

c.removeAll(Collections.singleton(null));
   

This idiom uses Collections.singleton, which is a static factory method that returns an immutable Set containing only the specified element.

References : oracle share on :        :  

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