@Override
public int compare(People o1, People o2) {
// TODO Auto-generated method stub
return o2.getAge() - o1.getAge();
}
@Override
public int compare(People o1, People o2) {
// 如果年龄相等，想按姓名排序的话，自己补充
return o1.getAge() - o2.getAge();
}