理解:Set中不包含重复元素.Set有三种实现方式:HashSet,TreeSet和LinkedHashSet这三种.当你需要一个操作速度较快的集合的时候,HashSet很合适;如果你需要一个元素有序的集合的时候,TreeSet很合适;当你需要保存元素的插入顺序的时候,LinkedHashSet很合适. 2. HashSet vs. TreeSet vs. LinkedHashSet HashSet is Imp...
It is generally faster to add elements to the HashSet and then convert the collection to a TreeSet for a duplicate-free sorted traversal. None of these implementation are synchronized. That is if multiple threads access a set concurrently, and at least one of the threads modifies the set, i...
1)LinkedHashSet implementation is a subclass of the HashSet class. It works similarly to a HashSet, except for one important detail. Unlike a HashSet, a LinkedHashSet guarantees that the iterator will access the elements in insertion order, that is, in the order in which they were inserted...
This implementation spares its clients from the unspecified, generally chaotic ordering provided by HashSet, without incurring the increased cost associated with TreeSet. It can be used to produce a copy of a set that has the same order as the original, regardless of the original set's implemen...
implementation spares its clients from the unspecified, generally chaotic ordering provided byHashSet, without incurring the increased cost associated withTreeSet. It can be used to produce a copy of a set that has the same order as the original, regardless of the original set's implementation: ...
implementation spares its clients from the unspecified, generally chaotic ordering provided byHashSet, without incurring the increased cost associated withTreeSet. It can be used to produce a copy of a set that has the same order as the original, regardless of the original set's implementation: ...
implementation spares its clients from the unspecified, generally chaotic ordering provided byHashSet, without incurring the increased cost associated withTreeSet. It can be used to produce a copy of a set that has the same order as the original, regardless of the original set's implementation: ...
implementation spares its clients from the unspecified, generally chaotic ordering provided byHashSet, without incurring the increased cost associated withTreeSet. It can be used to produce a copy of a set that has the same order as the original, regardless of the original set's implementation: ...
implementation spares its clients from the unspecified, generally chaotic ordering provided byHashSet, without incurring the increased cost associated withTreeSet. It can be used to produce a copy of a set that has the same order as the original, regardless of the original set's implementation: ...