LinkedHashSet是Set集合的一个实现,具有set集合不重复的特点,同时具有可预测的迭代顺序,也就是我们插入的顺序。 并且linkedHashSet是一个非线程安全的集合。如果有多个线程同时访问当前linkedhashset集合容器,并且有一个线程对当前容器中的元素做了修改,那么必须要在外部实现同步保证数据的冥等性。 下面
TreeSet is implemented using a tree structure(red-black tree in algorithm book). The elements in a set are sorted, but the add, remove, and contains methods has time complexity of O(log (n)). It offers several methods to deal with the ordered set like first(), last(), headSet(), ...
println(platformSet.remove("微信公众号"));System.out.println("platformSet的元素个数为:" + platformSet.size());System.out.println("isEmpty:" + platformSet.isEmpty());System.out.println("使用Iterator遍历:");Iterator<String> platformIterator = platformSet.iterator();while (platformIterator....
使用Iterator遍历: 博客园 掘金 使用foreach遍历: 博客园 掘金 isEmpty:true 2. LinkedHashSet使用 LinkedHashSet也是Set接口的实现类,底层数据结构是链表和哈希表,哈希表用来保证元素唯一,链表用来保证元素的插入顺序,即FIFO(First Input First Output 先进先出)。 LinkedHashSet类的代码声明如下所示: publicclassLin...
Set add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray Constructor Details LinkedHashSet public LinkedHashSet(int initialCapacity, float loadFactor) Constructs a new, empty linked hash set with the specified initial...
public Iterator<E> iterator() { return map.keySet().iterator(); } /** * 获取元素数量 */ public int size() { return map.size(); } /** * 判断是否为空 */ public boolean isEmpty() { return map.isEmpty(); } /** * 判断HashSet是否存在该 对象 ...
remove(recordToAdd); metadataRecords.add(recordToAdd); // Now remove the first element (which should be the oldest) from the list // if we've exceeded the cache size if (cacheSize != -1 && metadataRecords.size() > cacheSize) { Iterator<GlobalMetadata> recordIt = metadataRecords....
In this approach, we will use the iterator() method and find the first element in LinkedHashSet. Create a LinkedHashSet instance and add elements to the set using the add() method. Create an iterator instance and retrieve the first element using next() method. Print the first element of...
API methods overriden: sizeHint, addAll, remove abstract iterator class HashMapIterator added private classes Node, DeserializationFactory added Modified methods: apply, getOrElse, getOrElseUpdate, put Sorry, something went wrong. Copy link
iterator().next(); set = Sets.newLinkedHashSet(); set.add(val); } else { set = Sets.newLinkedHashSet(set); } } set.add(element); return set; } 代码示例来源:origin: google/guava /** * Returns a new proxy for {@code interfaceType}. Proxies of the same interface are equal to...