Map<String, String> data = new HashMap<String, String>();
//-------------------------
data.put("name", "bik");
//-------------------------
for (Map.Entry<String, String> entry : data.entrySet()) {
Lod.i("kv pair", "Key -> "+ entry.getKey() +" value -> "+ entry.getValue() );
}
//-----------------------
if (data.containsKey("phone")) {
}
//-----------------------
if (data.containsValue("asdads@sdfg.com")) {
}
http://java.dzone.com/articles/hashmap-%E2%80%93-single-key-and