Java Traversal Map Collection method

package testmap;import java.util.arraylist;import java.util.hashmap;import  Java.util.iterator;import java.util.list;import java.util.map;import java.util.map.entry;import  java.util.Set;/** *  Loop through the map collection  *  *  @author  Administrator *   */public class circlemap {public static void main (String[] args)  {Map<Integer, String> tempMap = new HashMap<Integer, String> () ; Tempmap.put (1,  "Zhang San"); Tempmap.put (2,  "John Doe"); Tempmap.put (3,  "Harry");/** * jdk1.4   Traverse method One  hashmap entryset ()   Traverse  */system.out.println ("---------------------------------------- --------------"); System.out.println (""); System.out.println ("Method one:"); Iterator it = tempmap.entryset (). Iterator ();while  (It.hasnext () )  {Map.Entry entry =  (Map.entry)  it.next (); Object key = entry.GetKey (); Object value = entry.getvalue (); System.out.println ("key = "  + key +  " value = "  + value );} In/** * jdk1.5, a new feature is applied to For-each cycle  */system.out.println (""); System.out.println ("Method two:");for  (map.entry<integer, string> entry :  Tempmap.entryset ())  {string key = entry.getkey (). toString (); String value = entry.getvalue (). toString (); System.out.println ("key = "  + key +  " value = "  + value );} /** *  Traversal Method Three  hashmap keyset ()   Traverse  */system.out.println (""); System.out.println ("Method Three:");for  (Iterator i = tempmap.keyset (). Iterator ();  i.hasnext () ;)  {object obj = i.next (); System.out.println (obj);//  loop output KeySystem.out.println ("key = "  + obj +  "  value =  " + tempmap.get (obj));} For&nbSP; (Iterator i = tempmap.values (). Iterator ();  i.hasnext ();)  {object obj =  i.next (); System.out.println (obj);//  loop output value}/** *  Traversal method four  treemap keyset () traversal  */ System.out.println (""); System.out.println ("Method Four");for  (Object o : tempmap.keyset ())  {system.out.println ("Key  =  " + o + "  value =  " + tempmap.get (o));} System.out.println ("------------------------------------------------------");/** * java how to traverse map  <String, ArrayList> map = new HashMap * <String,ArrayList> (); &NBSP;*//*SYSTEM.OUT.PRINTLN ("Java Traversal map <string, arraylist> map = new  Hashmap <string,arraylist> (); "); Map<string, arraylist> map = new hashmap<string, arraylist> (); Set<string> keys = map.keyset (); iterator<string>&nBsp;iterator = keys.iterator ();while  (Iterator.hasnext ())  {String key =  Iterator.next (); Arraylist arraylist = map.get (Key);for  (object o : arraylist)  { SYSTEM.OUT.PRINTLN (o +  "traversal Process");}} System.out.println ("======================================="); Map<string, list> maplist = new hashmap<string, list> ();for  ( Map.entry entry : maplist.entryset ())  {string key = entry.getkey (). toString (); list<string> values =  (List)  entry.getvalue ();for  (string value :  values)  {system.out.println (key +  " --> "  + value);}} */}}

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Java Traversal Map Collection method