1.源码如下: TreeSet A NavigableSet implementation based on a TreeMap. The elements are ordered using their natural ordering, or by a Comparator provided at set creation time, depending on which constructor is used. This implementation provides guaranteed log(n) time cost for the basic operations...
Returns a view of the portion of this set whose elements are less than (or equal to, ifinclusiveis true)toElement. The returned set is backed by this set, so changes in the returned set are reflected in this set, and vice-versa. The returned set supports all optional set operations tha...
TreeSet = [100, 90, 80, 70, 60, 50, 40, 30, 20, 10] java.util.Collections$ReverseComparator@7ff95560 Time Complexity: O(n log n ) for inserting n elements (due to balanced tree operations). Space Complexity: O(n) as TreeSet stores n elements. Conclusion Using a TreeSet with ...
The returned set is backed by this set, so changes in the returned set are reflected in this set,and vice-versa. The returned set supports all optional set operations that this set supports. The returned set will throw an IllegalArgumentException on an attempt to insert an element outside i...
This implementation provides guaranteed log(n) time cost for the basic operations (add, remove and contains). Note that the ordering maintained by a set (whether or not an explicit comparator is provided) must be consistent with equals if it is to correctly implement the Set interface. (See ...
class offers constant time performance for the basic operations (add, remove, contains and size). it does not guarantee that the order of elements will remain constant over time iteration performance depends on theinitial capacityand theload factorof the HashSet. ...
* operations ({@code add}, {@code remove} and {@code contains}). * * Note that the ordering maintained by a set (whether or not an explicit * comparator is provided) must be consistent with equals if it is to * correctly implement...
The stack interface represents a last-in-first-out (LIFO) collection of objects. The usual push and pop operations are provided, as well as a method to peek at the top item on the stack, a method to check whether the stack is empty and the size (number of elements). All stacks imple...
Returns a view of the portion of this set whose elements are greater than or equal tofromElement. The returned set is backed by this set, so changes in the returned set are reflected in this set, and vice-versa. The returned set supports all optional set operations that this set supports...
This implementation provides guaranteed log(n) time cost for the basic operations (add, remove and contains). Note that the ordering maintained by a set (whether or not an explicit comparator is provided) must be consistent with equals if it is to correctly implement the Set interface. (See ...