Sequence Reversible, Collection __getitem__, __len__ __contains__, __iter__, __reversed__, index, and count Set Collection __contains__, __iter__, __len__ __le__, __lt__, __eq__, __ne__, __gt__, __ge__, __and__, __or__, __sub__, __xor__, and isdisjoin...
Iterator接口也是Java集合框架的成员,但它与Collection系列,Map系列的集合不一样:Collection系类集合,Map系列集合主要用于转其他对象,而Iterator则主要用于遍历(也就是迭代访问)Collection集合中的元素,Iterator对象也被称为迭代器. Iterator接口隐藏了各种Collection实现类的底层细节,向应用程序提供了遍历Collection集合元素的统...
Retrieves multiple items from the iterator. C++/WinRT The correct syntax for the C++/WinRT language projection is uint32_t GetMany(winrt::array_view<T> items);. MoveNext() Advances the iterator to the next item in the collection.Applies...
其他集合(Map/Set)使用迭代器迭代也是一样。 当使用 fail-fast iterator 对 Collection 或 Map 进行迭代操作过程中尝试直接修改 Collection / Map 的内容时,即使是在单线程下运行, java.util.ConcurrentModificationException 异常也将被抛出。 Iterator 是工作在一个独立的线程中,并且拥有一个 mutex 锁。 Iterator ...
当使用 fail-fast iterator 对 Collection 或 Map 进行迭代操作过程中尝试直接修改 Collection / Map 的内容时,即使是在单线程下运行, java.util.ConcurrentModificationException 异常也将被抛出。 Iterator 是工作在一个独立的线程中,并且...
(1) 使用方法iterator()要求容器返回一个Iterator。第一次调用Iterator的next()方法时,它返回序列的第一个元素。注意:iterator()方法是java.lang.Iterable接口,被Collection继承。 (2) 使用next()获得序列中的下一个元素。 (3) 使用hasNext()检查序列中是否还有元素。
Actions are performed in the order of iteration, if that order is specified. Exceptions thrown by the action are relayed to the caller. The behavior of an iterator is unspecified if the action modifies the collection in any way (even by calling the #remove remove method or other mutator ...
Returns the next element in the iteration. default voidremove() Removes from the underlying collection the last element returned by this iterator (optional operation). Method Detail hasNext boolean hasNext() Returnstrueif the iteration has more elements. (In other words, returnstrueifnext()would re...
Returns the next element in the iteration. void remove() Removes from the underlying collection the last element returned by this iterator (optional operation). Method Detail hasNext boolean hasNext() Returns true if the iteration has more elements. (In other words, returns true if next() woul...
当Iterator迭代一个容器的时候,如果此时有别的方法在更改Collection(容器)的内容,那么Iterator就会抛出 ConcurrentModificationException 。正如官方文档中反复强调的: Thus, in the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic ...