private Map<Integer,String> selected = new HashMap<Integer,String>();

selected.put(key,value);

方法一：
Iterator it =selected .keySet().iterator();

 while (it.hasNext())
 {
     Integer key=(Integer)it.next();
     String xuehao=selected .get(key);

 }
方法二：
 Iterator it=adapter.getSelected().entrySet().iterator();//效率较高
 while (it.hasNext())
 {
     Integer key=(Integer)it.next();
     String xuehao=selected().get(key);

 }