map 中values 返回列表,可以将器转化为list
@Test
public void testMap2List() throws Exception{
Map<String, String> map = new HashMap<String, String>();
map.put("1", "AA");
map.put("2", "BB");
map.put("3", "CC");
map.put("4", "DD");
Collection<String> valueCollection = map.values();
final int size = valueCollection.size();
List<String> valueList = new ArrayList<String>(valueCollection);
String[] valueArray = new String[size]; map.values().toArray(valueArray); }