6 ways to traverse the collection collection:

The following code demonstrates the 6 ways to traverse the collection collection, noting that the collection collection's traversal is much more than the enhanced for loop, and the iterator two.

The code is as follows:

1  PackageCom.qls.traverse;2 3 Importjava.util.ArrayList;4 Importjava.util.Arrays;5 Importjava.util.Collections;6 Importjava.util.Enumeration;7 ImportJava.util.Iterator;8 Importjava.util.LinkedList;9 Importjava.util.List;Ten ImportJava.util.Stack; One  A /** - * Here are a few ways to traverse collection, with the list interface as an example: -  * @authorQuinlinson the  * -  */ -  Public classListtest { -  +      Public Static voidMain (string[] args) { -         //TODO auto-generated Method Stub +String[] s= "Sixi is one of the most beautiful villages". Split (""); Alist<string> list =Arrays.aslist (s); at         /** - * The first method is enhanced for loop. (The reason why the list can be enhanced for loops here is because it implements the Iterable interface) -          */ -          for(String str:list) { -System.out.print (str+ ""); -         } in System.out.println (); -System.out.println ("************"); to         /** + * The second method uses iterator -          */ theIterator<string> it =list.iterator (); *          while(It.hasnext ()) { $String next =It.next ();Panax NotoginsengSystem.out.print (next+ ""); -         } the System.out.println (); +System.out.println ("************"); A         /** the * The third method is mainly for LinkedList. Because LinkedList has both stack characteristics and queues (queue) + * features. So iterate through the elements in the LinkedList. Depending on the stack and queue, the related traversal can be performed.  - * The method of traversal is as follows: $          */ $         //Using LinkedList as a stack -Linkedlist<string> list2=NewLinkedlist<> (list);//creates a linkelist that contains all the elements in the list.  -          while(!List2.isempty ()) { theSystem.out.print (List2.removefirst () + ""); -         }Wuyi System.out.println (); theSystem.out.println ("************"); -         /** Wu * Using LinkedList as a queue -          */ AboutLinkedlist<string> list3=NewLinkedlist<>(list); $          while(List3.peek ()! =NULL){ -System.out.print (List3.poll () + ""); -         } - System.out.println (); ASystem.out.println ("************"); +         /** the * Fourth method to traverse all collection as enumeration - * Collections.enumeration (c) $          */ theArraylist<string> list4=NewArraylist<>(list); theEnumeration<string> e =collections.enumeration (LIST4); the          while(E.hasmoreelements ()) { theSystem.out.print (e.nextelement () + ""); -         } in         /**Fifth Method the * Of course there are other methods such as: the          */ About System.out.println (); theSystem.out.println ("************"); the          for(intI=0;i<list4.size (); i++){ theSystem.out.print (List4.get (i) + ""); +         } - System.out.println (); theSystem.out.println ("************");Bayi         /**The Sixth method: the * again as: the          */ -          while(!List4.isempty ()) { -             intIndex=0; theSystem.out.print (List4.remove (index++) + ""); the         } the         /** the * Note: ArrayList LinkedList is most commonly used in all implementation classes in the list interface . - * Arralist is faster than LinkedList, generally the case of ArrayList is more than LinkedList.  the * There is a serialversionuid in the ArrayList source code, this number is guaranteed, the * Write File (Objectoutputstream.writeobject (Object)) the * Read the file (Objectinputstream.readobject ()) can proceed smoothly,94 * and indicate this number, you can maintain the compatibility of each version. facilitates file transfer.  the          */ the          the     }98  About}/*Output: - Sixi is one of the most beautiful villages in China101 ************102 Sixi is one of the most beautiful villages in China103 ************104 Sixi is one of the most beautiful villages in China the ************106 Sixi is one of the most beautiful villages in China107 ************108 Sixi is one of the most beautiful villages in China109 ************ the Sixi is one of the most beautiful villages in China111 ************ the Sixi is one of the most beautiful villages in China*///:~

6 ways to traverse the collection collection: