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:456

b:789