小编The*_*est的帖子

任何人都知道这个错误说的是什么:

在jsp文件中的行:388处发生错误:/hisicalical_weather.jsp

如果源级别低于1.7,则无法为String类型的值打开.只允许使用可转换的int值或枚举变量

我在用Java 7.0.我仍然得到这个错误.谢谢

例如：以下哪个包名是正确的？

com.google.payrolldivision;

或者

com.google.payrollDivision;

请只回答问题而不绕圈子？

我正在编写一个需要一些最终变量的java程序.java类必须是单例对象.我无法直接初始化最终变量.这是我的代码:

 public class Car {

    private Price price = null;

    //Constructor
    public Car(Price p) {
       this.price = p;
    }

    //method to get the singleton
    private static Car instance = null;       
    public static Car getInstance(Price p) {
       if(instance == null) {
          instance = new ExcelUtil2(p);
       }
       return instance;
    }

    //declare & initialize final variable
    private final Wheel WHEEL_TYPE = getWheelType();

    //get value of the final variable
    public Wheel getWheelType() {

        Wheel wheel = Car.createWheel();

        if(price.getAmount() > 30000){
            wheel.setWheelType("Alloy");
        }else{
            wheel.setWheelType("Alluminium");
        } …

我有一张名为'ADDRESSES'的桌子.

我的查询:

select MODIFIED_DATE, CITY from ADDRESSES order by MODIFIED_DATE desc, CITY asc;

通过运行上面的查询我得到:

MODIFIED_DATE   CITY
=============   ==============
13-JAN-16       CHICAGO
13-JAN-16       CHICAGO
13-JAN-16       CHICAGO
13-JAN-16       KANSAS CITY
13-JAN-16       KANSAS CITY
13-JAN-16       KANSAS CITY
13-JAN-16       KANSAS CITY
13-JAN-16       KANSAS CITY
13-JAN-16       CHICAGO
13-JAN-16       CHICAGO
13-JAN-16       DENVER
13-JAN-16       DENVER

但我希望:

MODIFIED_DATE   CITY
=============   ==============
13-JAN-16       CHICAGO
13-JAN-16       CHICAGO
13-JAN-16       CHICAGO
13-JAN-16       CHICAGO
13-JAN-16       CHICAGO
13-JAN-16       DENVER
13-JAN-16       DENVER
13-JAN-16       KANSAS CITY
13-JAN-16       KANSAS CITY
13-JAN-16       KANSAS CITY
13-JAN-16       KANSAS CITY
13-JAN-16       KANSAS …