java - 方法错误，Class不能应用于不同类型？

Question

我想将主方法中的字符串转换为另一个方法中的整数，但出现错误。

`    public static void main(String[] args) 
 {

      System.out.println("Enter a date (use the format -> (MM/DD/YYYY)");

      //declare Scanner
      Scanner in = new Scanner (System.in);

      System.out.println("Enter a month (MM): ");
      String month = in.nextLine();

      System.out.println("Enter a day (DD): ");
      String day = in.nextLine();

      System.out.println("Enter a year (YYYY): ");
      String year = in.nextLine();

    String enteredDate = month + "/" + day + "/" + year;

    if (main.isValidDate(enteredDate))
      {
        main.leapYearCheck();
    }
}

private boolean isValidDate(String enteredDate) 
 {
    //logic
    parsedDate = null;// if it's valid set the parsed Calendar object up.
    return true;
}

// other code

private void leapYearCheck(String year) 
 {
        //leapyear
        int theYear = Integer.parseInt(year);

        if (theYear < 100) 
        {
            if (theYear > 40) 
            {
                theYear = theYear + 1900;
            }
            else 
            {               
                theYear = theYear + 2000;
            }
        }

        if (theYear % 4 == 0) 
        {
            if (theYear % 100 != 0) 
            {
                System.out.println(theYear + " is a leap year.");
            }
            else if (theYear % 400 == 0) 
            {
                System.out.println(theYear + " is a leap year.");
            }
            else 
            {
                System.out.println(theYear + " is not a leap year.");
            }
        }
        else 
        {
            System.out.println(theYear + " is not a leap year.");
        }
}//end of leap year

//other code }`

我收到错误: Date.java:31: 错误:Date类中的方法leapYearCheck无法应用于给定类型；
main.leapYearCheck();
^
必需:字符串
发现:没有参数
原因:实际参数列表和正式参数列表的长度不同
1 个错误

我不明白这个错误。说我需要一个字符串，并且由于该方法使用整数(我认为)我需要返回一个字符串？我该如何解决这个问题？

Answer 1

您需要根据定义将年份以字符串形式传递给 leapYearCheck 方法。