reverse [ ri'və:s ] 反转,翻转 collection [kə'lekʃən] 集合,聚集,采集 Remove [ri'mu:v] 移除,删除 clear [kliə] 清空,清除,清楚的. Iterator [itə'rei tə] 迭代器 list [list] 列表,清单(集合之一) ArrayList ['əri list] 数组列表(最常用的集合,重点掌握) HasPrevious [...
public static void main(String[] args) { LinkedHashSet<Integer> integers = new LinkedHashSet<>(); for (int i = 0; i < 10000; i++) { integers.add(i); } traverseByIterator(integers); traverseByFor(integers); } private static void traverseByFor(LinkedHashSet<Integer> hashSet) { lon...
API---ASetthat further provides atotal orderingon its elements. The elements are ordered using theirnatural ordering, or by aComparatortypically provided at sorted set creation time. The set's iterator will traverse the set in ascending element order. Several additional operations are provided to ...
javaList返回所有javalistfiles方法返回为空 java进行文件遍历话不多说直接上代码public static void traverseFolder(String path) { //这是一个已经封装好了的方法,直接传入对应的地址的参数就行了; File file = new File(path); if (file.exists()) { //首先这个文件是存在的; File[] files = file. ...
reverse:将线性表进行逆序操作,这个可是从前数据结构的经典考题哦! rotate:以某个元素为轴心将线性表“旋转”。 swap:交换一个线性表中两个元素的位置。 …… Collections还有一个重要功能就是“封装器”(Wrapper),它提供了一些方法可以把一个集合转换成一个特殊的集合,如下: ...
public static void traverseByIterator(ArrayList<Integer> a1){ Iterator<Integer> iter1 = a1.iterator(); while(iter1.hasNext()){ iter1.next(); } } //索引遍历 速度中等 public static void traverseByIndex(ArrayList<Integer> a1){ for(int i = 0; i<a1.size(); i++){ ...
All of the operations perform as could be expected for a doubly-linked list. Operations that index into the list will traverse the list from the beginning or the end, whichever is closer to the specified index. Note that this implementation is not synchronized.If multiple threads access a link...
In this approach, we traverse the linked list using two pointers. One pointer is incremented by one while the other is incremented by two. When the fast pointer reaches the end, the slow pointer will be at the middle of the linked list. The time complexity of this solution is O(n...
All of the operations perform as expected for a doubly-linked list. Operations that index into the list will traverse the list from the start or the end, whichever is closer to the specified index. 5. HashMap Class Hash table based implementation of the Map interface. This implementation prov...
sorted(Map.Entry.comparingByValue(Comparator.reverseOrder())) .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, (oldValue, newValue) -> oldValue, LinkedHashMap::new)); //根据key正序 Map<String, Integer> result3 = map.entrySet().stream(). sorted(Map.Entry.comparingByKey...