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Collections class Methods in Java Part -II

java.util.Collections

This class consists exclusively of static methods that operate on or return collections. This class is a member of the Java Collections Framework.


Some Methods of Collections class.


Collections.emptyNavigableMap(): This method returns an empty navigable map.


Collections.emptyNavigableSet(): This method returns an empty navigable set.


Collections.emptySet(): This method returns an empty set.


Collections.emptySortedMap(): This method returns an empty sorted map.


Collections.emptySortedSet(): This method returns an empty sorted set.


Collections.fill(List, E): This method replaces all of the elements of the specified list with the specified element.


Collections.frequency(Collection, Object): This method returns the number of elements in the specified collection equal to the specified object.


Collections.indexOfSubList(List, List): This method returns the starting position of the first occurrence of the specified target list within the specified source list, or -1 if there is no such occurrence.


Collections.lastIndexOfSubList(List, List): This method returns the starting position of the last occurrence of the specified target list within the specified source list, or -1 if there is no such occurrence.


Collections.list(Enumeration):  This method returns an array list containing the elements returned by the specified enumeration in the order they are returned by the enumeration.


Collections.max(Collection): This method returns the maximum element of the given collection, according to the natural ordering of its elements.


Collections.max(Collection, Comparator): This method returns the maximum element of the given collection, according to the order induced by the specified comparator.


Collections.min(Collection): This method returns the minimum element of the given collection, according to the natural ordering of its elements.


Collections.min(Collection, Comparator): This method returns the minimum element of the given collection, according to the order induced by the specified comparator.


Collections.nCopies(int, List): This method returns an immutable list consisting of n copies of the specified object.


Collections.newSetFromMap(Map): This method returns a set backed by the specified map. The resulting set displays the same ordering, concurrency, and performance characteristics as the backing map.


Collections.replaceAll(List, E, E): This method replaces all occurrences of one specified value in a list with another.


Collections.reverse(List): This method reverses the order of the elements in the specified list.


Collections.reverseOrder(): This method returns a comparator that imposes the reverse of the natural ordering on a collection of objects that implement the Comparable interface.


Collections.rotate(List, int): This method rotates the elements in the specified list by the specified distance.


Some more Methods of Collections class Part -I


Some more Methods of Collections class Part -III


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