Java 从其他文件调用函数”；Can'；“找不到符号”；

尝试调用不同类中的函数进行练习

我们被告知使用以下函数调用

MonthName.month_name();
WeekdayName.weekday_name();
MonthOffset.month_offset();
WeekdayCalculator.is_leap();

当我尝试MonthName.month_name（）时；它说它是一个非静态的方法，实际上它是一个静态的方法，如下图所示，我通过调用

MonthName monthObject = new MonthName();

解决了这个问题。但我尝试调用的每一个其他函数都会得到它找不到符号的消息

我试图在其中调用函数的类

public class callingfunctionsfromotherfiles



public static void main(String[] args)
{
    // TODO code application logic here

    Scanner scan = new Scanner(System.in);
    String finalDate="";
    System.out.println("Pleaase enter your date of birth in this format dd mm yyyy");
    String dob=scan.nextLine(); // date of birth entered by the user


    String d = dob.substring(0,2); //split the dob into 3 parts
    String m = dob.substring(3, 5);
    String y = dob.substring(6, 10);

    int day = Integer.parseInt(d); //convert dob strings to int
    int month = Integer.parseInt(m);
    int year = Integer.parseInt(y);
    MonthName monthObject = new MonthName();
 // MonthName.month_name(month); non static???

 System.out.println(finalDate= "You where born on " + week_day(day, month, year) +", " + monthObject.month_name(month) + ", "+ day + ", " + year );

}



public static String week_day(int day, int month, int year)  // returns a string value for the week day with integer parameters of day,month,year
   {

       MonthOffset offsetObject = new MonthOffset(); //"Can't find symbol"
       WeekDayCalculator leapObject = new WeekDayCalculator(); //"Can't find symbol"
       WeekDayName wkdayObject = new WeekDayName(); //"Can't find symbol"

   int yy = year - 1900;
   int total = yy / 4 + yy + day + offsetObject.month_offset(month);
  // weekDayCalculator.month_offset();

   //WeekDayCalculator.is_leap();
    boolean leap = leapObject.is_leap(year); //pass "year" into the is_leap method which returns true or false
    if(leap == true && month == 1 || month == 2) //if it is a leap year and the month == 1(january) 2(february) subtract 1 from the total
    {
        total-= -1;
    }


   total = total %7; //total is remainder of (total / 7)
   String finalDay = wkdayObject.weekday_name(total); // call weekday_name and pass in total, giving finalDay a string value from weekday_name

    return finalDay;




}

这是我创建对象时使用的类和函数，但也告诉我函数实际上是非静态的

public class monthname
{
public static String month_name(int num)

{
    String month ="";

    if( num == 1)
    {
        month ="January";
    }

    else if(num == 2)
    {
        month ="Feburary";
    }

    else if(num == 3)
    {
        month ="March";
    }

    else if(num == 4)
    {
        month ="April";
    }

    else if(num == 5)
    {
        month ="May";
    }

    else if(num == 6)
    {
        month ="June";
    }

    else if(num == 7)
    {
        month ="July";
    }

    else if(num == 8)
    {
        month ="August";
    }

    else if(num == 9)
    {
        month ="September";
    }

    else if(num == 10)
    {
        month ="October";
    }

    else if(num == 11)
    {
        month ="November";
    }

    else if(num == 12)
    {
        month ="December";
    }

    else
    {
        month ="error";
    }
    return month;

}
}

这是它找不到符号的类和函数之一。如果需要，将发布更多

public class monthoffset
{
 public static int month_offset(int month)
{
    int offset =0;

    if (month == 1)
    {
        offset=1;
    }
    else if (month == 2)
    {
        offset = 4;
    }
    else if (month == 3)
    {
        offset = 4;
    }
    else if (month == 4)
    {
        offset = 0;
    }
    else if (month == 5)
    {
        offset = 2;
    }
    else if (month == 6)
    {
        offset = 5;
    }
    else if (month == 7)
    {
        offset = 0;
    }
    else if (month == 8)
    {
        offset = 3;
    }
    else if (month == 9)
    {
        offset = 6;
    }
    else if (month == 10)
    {
        offset = 1;
    }
    else if (month == 11)
    {
        offset = 4;
    }
    else if(month ==12)
    {
        offset=6;
    }

    else
    {
       offset = -1;
    }


    return offset;
}

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}蒙特霍夫塞特不是蒙特霍夫塞特。如果出现语法错误，请尝试使用Eclipse或IntelliJ从IDE获得一些帮助。

这是语法错误。您没有MonthOffset等类。请将您的类的名称从MonthOffset更改为MonthOffset

---

惯例是。

在您发布的代码中，我只看到一个方法名

month\u name

。它位于类

monthoffset

中，需要一个int参数。很明显，

MonthName.month\u name（）

将不起作用。另外请注意Java是区分大小写的

monthoffset

和

monthoffset

不是一回事。好吧……在粘贴代码时，我粘贴了monthoffset而不是monthname作为类，不像我的ide上那样。我删除了所有内容，然后重新开始，仍然是完全相同的问题。类名现在完全按原样压缩了；在类为monthname时工作？但是我可以使用monthname monthObject=new monthname（）从monthname类调用month_name（）函数；也许您还有其他名称正确的类。IMO在提到的代码中，这是不可能的。