Map ways to loop through the collection of

cn.jdbc.test Package;
Import the java.util.HashMap;
Import the java.util.Iterator;
Import a java.util.Map;
Import java.util.Map.Entry;

/ **
 * Map collection cycle traversal
 * @data 2018.1 .21
 *
 * /
public class TestMap {

         public static void main (String [] args) {
              the Map <String, Object> = new new the HashMap Map <String, Object> ();
              map.put ( "AAA", 111);
              Map .put ( "BBB", 222);
              map.put ( "CCC", 333);
              map.put ( "ddd", 444);
              // set the Map mode loops through a  
             System.out.println ( "first : traversing through map.keySet () key and value: ");
            for (String key: map.keySet () ) {// keySet acquiring map set key set key can then traverse the
                String value = as map.get (key) .toString (); //
                System.out.println ( " key: "+ key +" vlaue: "+ value);
            }

           // set the Map by the iterator loop through two way
           System.out.println (" second: Map.entrySet traversal key and value by using the iterator: ") ;
           the Iterator <the entry <String, Object >> EnumMap.entrySet IT = () Iterator ();.
           the while (it.hasNext ()) {
                the entry <String, Object> = it.next entry ();
                System.out.println ( "Key:" entry.getKey + () + "Key:" entry.getValue + ());
          }

         // set the Map three recommended traversal cycle, especially when a large-capacity
        System.out.println ( "third : The Map.entrySet traverse key and value ");
        for (of Map.Entry <String, Object> m: EnumMap.entrySet ()) {
        System.out.println ( "Key:" m.getKey + () + "value:" + m.getValue ());
    }

         / / fourth:
         System.out.println ( "fourth: through all value by Map.values (), but not traversing Key");
        for (m Object: map.values ()) {
          the System.out. the println (m);
        }
   }
}