import java.util.Iterator; import java.util.LinkedHashMap; import java.util.Map; public class Main { public static void main(String[] argv) throws Exception { Map<String, String> map = new LinkedHashMap<String, String>(); map.put("1", "value1"); map.put("2", "value2"); map.put("3", "value3"); map.put("2", "value4"); for (Iterator it = map.keySet().iterator(); it.hasNext();) { Object key = it.next(); Object value = map.get(key); } } }