java - java中的静态方法，我可以以非静态方式访问静态方法吗？

Question

我认为我的代码有问题，以静态方式或以非方式调用(在 setIstance 中)方法 isSameMonth() 是否相同静态方式？编译器建议我将 timesheet.isSameMonth() 更改为 Timesheet.isSameMonth()

我认为不可以，因为我想传递本地变量timesheet，这是同样的事情还是我应该修改我的代码？

时间表类别:

static private Timesheet timesheet;

static public Timesheet getIstance()
{
    if (timesheet == null || !Timesheet.isSameMonth())
    {
        timesheet = null;
        timesheet = new Timesheet();
    }
    return timesheet;
}

static public void setIstance(Timesheet timesheet)
{
    if (timesheet != null && timesheet.isSameMonth())
    {
        Timesheet.timesheet = timesheet;
    }
}

public static boolean isSameMonth()
{
    Date now = new Date();
    Calendar calendarNow = Calendar.getInstance();
    calendarNow.setTime( now );
    Date firstDay = timesheet.days[0];
    Calendar calendarFirstDay = Calendar.getInstance();
    calendarFirstDay.setTime( firstDay );
    if (calendarNow.get(Calendar.MONTH) == calendarFirstDay.get(Calendar.MONTH))
    {
        return true;
    }
    return false;
}

我从外部调用此电话:

Gson gson = new Gson();
String json = sharedPrefs.getString("timesheet", "");
if (!json.isEmpty())
{
    try
    {
        Timesheet timesheet = Timesheet.getIstance();
        if (timesheet.getDay(0)==null)
        {
            Timesheet.setIstance( gson.fromJson(json, Timesheet.class) );
        }
        refreshWidget(timesheet, context, allWidgetIds, intent.getAction());
    }
    catch (Exception e)
    {
        Log.e(TAG_LOG, e.toString());
    }
}

Answer 1

无论哪种方式都可以工作，但约定是通过类名引用静态方法:

Timesheet.isSameMonth()

这可以让阅读您代码的人清楚地知道您正在调用静态方法。