hashmap和arraylist遍历

codeTool

TeamService tService=new TeamService();
//hashmap用entry遍历
HashMap<Integer, ArrayList<Student> > hasmap=tService.getAllTeam();
Iterator it = hasmap.entrySet().iterator();  
while(it.hasNext()){  
    Entry  entry=(Entry)it.next(); 
    //先得到object，再转
    Object key=entry.getKey();
    int teamid=Integer.parseInt(key.toString());
    Object value=entry.getValue();  
    ArrayList<Student> arrayList=(ArrayList<Student>)value;
    //arraylist遍历，知道类型，取出，找到对应的arraylist
    for (Student student : arrayList) {
        System.out.println(student.getStuid());
    }
}