遍历 HashMap

使用 entrySet：

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();
}

//or
Map<String,String> map = new HashMap<String,String>();
for (Entry<String,String> entry : map.entrySet()) {
    entry.getKey();
    entry.getValue();
}

使用 keySet：

Map map = new HashMap();
Iterator iter = map.keySet().iterator();
while (iter.hasNext()) {
    Object key = iter.next();
    Object val = map.get(key);
}

//or
Map<String, String> map = new HashMap<String, String>();
for (String key : map.keySet()) {
    map.get(key);
}