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Map<String, String> map = new HashMap<String, String>();
/**
 * 方法1-普遍使用，二次取值
 * */
for (String key : map.keySet()) {
  System.out.println("key= "+ key + " and value= " + map.get(key));
}

/**
 * 方法2-通过Map.entrySet使用iterator遍历key和value
 * */
Iterator<Map.Entry<String, String>> it = map.entrySet().iterator();
while (it.hasNext()) {
  Map.Entry<String, String> entry = it.next();
  System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
} 

/**
 * 方法3推荐，尤其是容量大时
 * */
for (Map.Entry<String, String> entry : map.entrySet()) {
  System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
}

/**
 * 方法4-通过Map.values()遍历所有的value，但不能遍历key
 * */
for (String v : map.values()) {
  System.out.println("value= " + v);
}