/**
* 获得此组用户
*
* @param userId 用户Id
* @return 用组中有用户id为userId的用户，返回他，否则返回空
*/
public UserPo getUser(String userId) {
UserPo up = null;
for (UserPo _up : userList) {
if (_up.getUserId().equals(userId)) {
up = _up;
break;
}
}
return up;
}
public void addOneUser(UserPo up) {
for (UserPo _up : userList) {
if (up.getUserId().equals(_up.getUserId())) return;
}
userList.add(up);
}