遍历hashmap的键值一，通过 keySet()方法

/** * 遍历hashmap的键值，通过 keySet()方法 * @author gulijiang * */public class HashMapTest1 {public static void main(String[] args) {HashMap hashMap = new HashMap();hashMap.put("a", "aa");hashMap.put("b","bb");hashMap.put("c","cc");print(hashMap);}private static void print(HashMap hashMap) {Set set = hashMap.keySet();for (Iterator iterator = set.iterator(); iterator.hasNext();) {String key = (String)iterator.next();System.out.println(key);System.out.println(hashMap.get(key));}}}