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This article is to share with you about the usefulness of the Collections collection utility class in Java. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Collections is a utility class that manipulates collections such as Set, List, and Map.

Collections provides a series of static methods to sort, query and modify collection elements, as well as immutable collection objects and synchronous control of collection objects.

Sort operation reverse (List): reverse the order of elements in List shuffle (List): randomly sort List collection elements sort (List): sort specified List collection elements in ascending order according to the natural order of elements sort (List,Comparator): sort List collection elements according to the order generated by the specified Comparator swap (List,int Int): crosses and replaces Object max (Collection) elements at I and j in the specified list collection: according to the natural order of the elements Returns the largest element in a given collection Object max (Collection,Comparator): returns the largest element Object min (Collection) Object min (Collection,Comparator) int frequency (Collection,Object) in the given set in the order specified by Comparator: returns the number of occurrences of the specified element in the specified collection void copy (List dest,List src): copies the contents of src to dest boolean replaceAll (List list,Object oldVal,Object newVal): replaces all old value synchronization controls of List objects with new values

Several synchronizedXxx () methods are provided in the Collections class, which enables the specified set

It is packaged into a collection of thread synchronization, which can solve the thread safety when multiple threads access the collection concurrently.

problem.

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