Two kinds of traversal methods of map collection in Java

1. Declare a map:map MAP = new HashMap ();
2. Place values in map, note: Map is stored in key-value form. For example:

Map.put ("sa", "DD");

3. Take value from map: String str = map.get ("sa"). toString (); The result is: str = "DD";

4. Traverse a map to get the key and value from

JDK1.5

Map m = new HashMap ();
For (Object O:map.keyset ()) {
Map.get (o);
}

JDK1.4

Map map = new HashMap ();

Iterator it = Map.entryset (). Iterator ();
while (It.hasnext ())
{
Map.entry Entry = (map.entry) it.next ();
Object key = Entry.getkey ();
Object value = Entry.getvalue ();
}

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Two kinds of traversal methods of map collection in Java