list集合根据字段进行排序

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根据order进行排序

class User{
    Long id;
    String userName;
    String password;
    Long order;
}
List<User> list = new ArrayList<>();
list.sort((o1, o2) -> {
    Long o1Order = o1.getOrder;
    Long o2Order = o2.getOrder;
    //正序
    retrun o1Order.compareTo(o2Order);
    
    //倒序
    //return o2Order.compareTo(o1Order);
})