how to use iterator

: This article describes how to use Iterator, ArrayAccess, and Countable in 24php. For more information about PHP tutorials, see. The iterator is often used to facilitate data management when reading a large amount of data in the database.

Method definition of the category class: · Constructor: Public writable (inputstream source ); · Set the read delimiter: Public incluusedelimiter (string pattern ); · Determine whether data exists: Public Boolean hasnextxxx (); · Data Retrieval:

iterators are often used by us to facilitate data management when reading large amounts of data in a database. fruits[$this->position]; } Returns the current key public function key () { return $this->position } //Move

1. iterate the row of the fileCopy codeThe Code is as follows:Public static IEnumerable ReadLines (string fileName){Using (TextReader reader = File. OpenText (fileName )){String line;If (line = reader. ReadLine ())! = Null){Yield return

This article provides a detailed analysis of file traversal information using the iterator. For more information, see This article provides a detailed analysis of file traversal information using the iterator. For more information, see 1.

Import Java. util. collection; import Java. util. hashset; import Java. util. iterator; // The interator interface traverses the array set public class testiterator {/*** @ Param ARGs */public static void main (string [] ARGs) {// todo

Iterator is called an iterator. The iterator works with containers, such as the string and vector libraries. The iterator has two tasks: positioning and value. In my understanding, it is a high-level pointer. Why use it? I think it's flexible, but

Do not perform the remove/add operation of elements in the Foreach loop. The remove element uses the Iterator method, which requires a lock on the Iterator object if the concurrency operation. Positive example: iterator Iterator = List.iterator

It is well known that when iterating through an STL container using an iterator, special attention needs to be paid to whether the iterator is modified in the loop and causes the iterator to fail. Let me conclude by summarizing the use of iterators

Map, set, list, and so on. Preface:Today, I think of a set of map, set, list, and other materials, so I took some notes and provided them for your reference and future review. First, Map is mainly used to store the key-value pairs and obtain values

(5) next to the previous article, let's continue to discuss a small problem that may occur during collection class traversal-concurrentmodificationexceptionWe use arraylist as an example. When traversing a list, we can use the following three forms:(

I. SummaryThe iterator pattern is associated with a collection of co-deaths. Generally speaking. We just have to implement a container and we need to provide an iterator to the container at the same time. The advantage of using iterators is that

People who have learned C + + will be very familiar with STL Standard Template Library, STL is actually encapsulates a series of interfaces for us to call. The implementation of many functions or algorithms does not require us to write from scratch,

PS: I am a piece of cake, so this article is self-study after a summary, prawns please you drift overSet class overviewSet is the simplest collection, the objects in the collection are not sorted in a particular way, and there are no duplicate

[Help] ask for an APC expert ~~~ How does APC retrieve all cached entries? If it is unclear what keys are included in the cached entries, is there a way to retrieve all the cached entries? For help, APC experts ~~~ ------ Solution ------------------

About MapReduce and HDFs What is Hadoop? Google has proposed programming model MapReduce and Distributed file system for its business needs, and published relevant papers (available on Google Research's website: GFS, MapReduce). Doug Cutting and

the general traversal of the collection class, using Iterators to iterate:Iterator it = List.iterator ();While (It.hasnext ()) {Object obj = It.next ();} map Traversal mode: 1, by getting all keys to follow the key to traverse// get a set of all

Import Java. util. *; class animal {string name; int age;} public class list {public static void main (string ARGs []) {arraylist list = new arraylist (); list. add (1); list. add (2); list. add (3); list. add (4); list. add (5); list. add (6); //

Recently, I encountered a strange problem in the project. The reference code is as follows:[Java]Public class ListTest {Public static List listFactory (){Return new ArrayList (Arrays. asList ("a", "B", "c", "d "));}Public static void main (String []

  MAP is mainly used to store the key-value pairs and obtain values based on the keys. Therefore, duplicate keys are not allowed (repeated overwrites), but repeated values are allowed.Hashmap is the most commonly used map. It stores data based on