//根据List集合中某个对象中的元素对集合进行排序

//根据List集合中某个对象中的元素对集合进行排序
//排序字段为String时

java.util.Collections.sort(list,new Comparator<Bean>() {
    @Override
    public int compare(Bean arg0, Bean arg1) {
    return arg0.getBillNo().compareTo(arg1.getBillNo());
    }
});

//排序字段为int时

java.util.Collections.sort(glManifestIHeadList,new Comparator<GlManifestIHead>() {
                     @Override
                     public int compare(GlManifestIHead arg0, GlManifestIHead arg1) {
                         if(arg0.getBillNo()>arg1.getBillNo()){
            return  1;
                    }
                         if(arg0.getBillNo()<arg1.getBillNo()){
                                return  -1;
                    } 
                       return  0;    
};

//排序单纯String

String mealTypeId = req.getParameter("mealTypeId");//餐别 "0,3,5,1,2,4"
String [] meals = mealTypeId.split(",");
List<String> list = Arrays.asList(meals);
Collections.sort(list, String::compareTo);
mealTypeId = String.join(",", list);//"0,1,2,3,4,5"

、、
}