java - 从另一个类调用方法时遇到很多麻烦

Question

我的问题:我不断收到错误......(实际上有多个错误......)
"类 Appointment 中的方法 getYear 不能应用于给定类型； 必需:整数 发现:没有参数 原因:实际参数列表和形式参数列表的长度不同“

我一生都无法弄清楚如何解决这个问题。如果有人可以给我一些帮助，我已经尝试了几个小时但没有任何进展......

import java.util.Scanner;

public class Appointment
{
  protected int year = 0;
  protected int month = 0;
  protected int day = 0;
  protected String description = "";

  public Appointment(int year,int month ,int day, String description)
  {
    this.year = year;
    this.month = month;
    this.day = day;
    this.description = description;
  }

  public static void main(String[] args)
  {
    Appointment[] appointments = new Appointment[4];
    appointments[0] = new Daily(2011, 8, 13, "Brush your teeth.");
    appointments[1] = new Weekly(2012, 2, 3, "Buy groceries.");
    appointments[2] = new Monthly(2012, 5, 20, "Visit grandma.");
    appointments[3] = new Onetime(2012, 11, 22, "Dentist appointment.");
    //set all appointments as necessary.........
    System.out.println("Enter a date (year month day) to list "
                         + "appointments: ");
    Scanner in = new Scanner(System.in);
    int year = in.nextInt();
    int month = in.nextInt();
    int day = in.nextInt();
    for (int i = 0; i < appointments.length; i++)
    {
      if (appointments[i].occursOn(year, month, day))
      {
        System.out.println(appointments[i]);
      } // end if loop
    } //end for loop
  }//end main

  public int getYear(int year)
  {
    int year2 = 0;
    year2 = year;

    return year2;
  }

  public int getMonth(int month)
  {
    int month2 = 0;
    month2 = month;
    return month2;
  }

  public int getDay(int day)
  {
    int day2 = 0;
    day2 = day;
    return day2;
  }     

  public boolean occursOn(int year,int month,int day)
  {
    year = 0;
    month = 0;
    day = 0;
    return false;
  }

  public String toString()
  {
    String nothing = "";
    return nothing; // change this.  Needs to return appointments for that specific day combination.
  }
}

这是我的预约类(class)...其他文件是这个...

import java.util.Calendar;
import java.util.GregorianCalendar;

/**
 Weekly appointment
 */
public class Weekly extends Appointment
{

 /**
Initializes appointment for a given date
@param year the year
@param month the month
@param day the day
@param description the text description of the appointment
*/
public Weekly(int year, int month, int day, String description)
{
super(year, month, day, description);
}

/**
Determines if the appointment occurs on the same weekday
 @param year the year
@param month the month
@param day the day
@return true if day matches the base appointment weekdate date and is
later than the base appointment
*/
public boolean occursOn(int year, int month, int day)
{
    if (year < getYear())
    {
      return false;
    }
    if (month < getMonth() && year == getYear())
    {
       return false;
    }
    // we need to determine if the appointment is on the same day of the
    // week, the GregorianCalendar class is useful for that
    GregorianCalendar today = new GregorianCalendar(year, month, day);
    GregorianCalendar appointment = new GregorianCalendar(getYear(),
                                                      getMonth(), getDay());

    return today.get(Calendar.DAY_OF_WEEK) == appointment
      .get(Calendar.DAY_OF_WEEK);
  }
 }

谢谢大家的帮助!!! (已修复!)

Answer 1

在您的Weekly类(class)中，您有:

if (year < getYear())

您正在调用不带参数的 getYear()，但它在 Appointment 中定义为采用一个 int 参数。

public int getYear(int year)
{
  int year2 = 0;
  year2 = year;

  return year2;
}

根据该定义，您需要在调用该方法时将 int 传递给该方法。

您还可以更改 getYear() 的实现，以便它不接受参数，这是首选方法。您当前的实现似乎只是返回您传入的相同值。它可能应该返回在构造函数中设置的值 this.year 。