有没有大佬解读下代码

Question

求大佬解释这句nt reservestate = getPara("reservestate") == null || getPara("reservestate") == "" ? 100: Integer.parseInt(getPara("reservestate"));

public void index() {
        String name = getPara("name") == null ? "" : getPara("name");
        String store_id = getPara("store_id") == null ? "" : getPara("store_id");
        int reservestate = getPara("reservestate") == null || getPara("reservestate") == "" ? 100  : Integer.parseInt(getPara("reservestate"));
        String reserve_date = getPara("reserve_date") == null ? "" : getPara("reserve_date");
        String stime = "";
        String etime = "";
        if (StringUtil.isNotBlank(reserve_date)) {
            String[] arr = reserve_date.split(" - ");
            stime = arr[0].replace("/", "-");
            etime = arr[1].replace("/", "-") + " 23:59:59";
        }

        Page<Reserve> page = Reserve.dao.page(getParaToInt("pageNumber", 1), getParaToInt("pageSize", 10), name,
                store_id, reservestate, stime, etime);
        setAttr("page", page);
        setAttr("name", name);
        setAttr("store_id", store_id);
        setAttr("reservestate", reservestate);
        setAttr("reserve_date", reserve_date);
        render("index.html");
    }

Answer 1

谢谢波总

Answer 2

这段代码是错误的，因为 String 型的变量在 Java 中不能通过双等号来比较，改成这样：

int reservestate = StrKit.isBlank(getPara("reservestate")) ? 100: getParaToInt("reservestate");

当然，在 jfinal 之下，最优雅的改法是下面这样的：

int reservestate = getParaToInt("reservestate", 100);

 

Answer 3

reservestate属性默认值100