An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list. A ListIterator has no current element; its cursor position always lies between the element that would be returned...
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 take advantage of the ordering. (This interface is the set analogue ofSortedMap.) ...
49、List, Set, Map是否继承自Collection接口? List,Set是,Map不是 50、List、Map、Set三个接口,存取元素时,各有什么特点? List使用get(index)取值,也可以使用Iterator、toArray取值 Set只能通过Iterator、toArray取值 Map取值使用get(key)取值,也可以使用keySet取键值集合,也可使用values取值集合,entrySet取全部映射。
public static void main(String[] args) { // 创建一个LinkedHashMap对象 // Map<String, Integer> maps = new HashMap<>(); Map<String, Integer> maps = new LinkedHashMap<>(); // 向集合添加元素 maps.put("桌子", 2); maps.put("凳子", 10); maps.put("桌子", 10); // 键一样会覆...
System.out.println("\n===> 3. Iterator Example..."); Iterator<String>crunchifyIterator = crunchifyList.iterator(); while(crunchifyIterator.hasNext()){ System.out.println(crunchifyIterator.next()); } // ListIterator - traverse a list of elements in either forward or backward order // ...
The iterator returned by theiteratormethod traverses the elements in theirnatural order(the order in which the enum constants are declared). The returned iterator isweakly consistent: it will never throwConcurrentModificationExceptionand it may or may not show the effects of any modifications to the...
sort— sorts a List using a merge sort algorithm, which provides a fast, stable sort. (A stable sort is one that does not reorder equal elements.) shuffle— randomly permutes the elements in a List. reverse— reverses the order of the elements in a List. rotate— rotates all the elemen...
在 Java 编程中，排序是一个非常常见且重要的操作。Java 提供了多种排序机制，其中之一就是使用比较器...
The set's iterator will traverse the set in ascending element order. Several additional operations are provided to take advantage of the ordering. (This interface is the set analogue of SortedMap.) All elements inserted into a sorted set must implement the Comparable interface (or be accepted ...
The reverse is true as well: the methods of the containing type have access to all members of a static member type, including the private members. A static member type even has access to all the members of any other static member types, including the private members of those types. A sta...