Map map = new HashMap(); Iterator iter = map.entrySet().iterator(); while (iter.hasNext()) {     Map.Entry entry = (Map.Entry) iter.next();     Object key = entry.getKey();     Object val = entry.getValue(); 

import java.util.HashMap;import java.util.Iterator;import java.util.Map;public class testMap {    public static void main(String[] args){        testMap test = new testMap();        HashMap map = new HashMap<String, String>();        map.put("a", "123");        map.put("a", "456");        map.put("b", "789");        test.transMap(map);    }    void transMap(HashMap map){        Iterator iter = map.entrySet().iterator();        while(iter.hasNext()){            Map.Entry entry =(Map.Entry)iter.next();            Object key = entry.getKey();            Object val = entry.getValue();            System.out.println((String)key + ":" + (String)val);        }    }}

a:456b:789