这是我第一次在这里发帖，希望你们能够帮助我，无论如何，这是我的代码:
System.out.println("Would you like to run? (enter y to run): ");
Scanner scan = new Scanner(System.in);
char response = scan.next().charAt(0);
if(response == 'y' || response == 'Y'){
MyCalendar test1 = new MyCalendar();
System.out.println("Enter year, month, and day, separated by space: ");
int year = scan.nextInt();
int month = scan.nextInt();
int day = scan.nextInt();
if(MyCalendar.isValidDate(year,month, day)){
System.out.println("The above date is a valid date.");
System.out.println("Day of that day in its week: "+ MyCalendar.dayOfWeek);
System.out.println("Day of the date in its year: "+ MyCalendar.dayOfYear);
return;
}
else{
System.out.println("The above date is not valid.");
return;
}
}
}
}
在我放置 MyCalendar.dayOfWeek 和 MyCalendar.dayOfYear 的行上，它说找不到该变量，它在另一个类中。
我如何正确引用这个方法？
MyCalendar 类:
/**
* Check for validity of a date
*
* @param year int (>= 1900 and <= 2100)
* @param month int
* @param day int
* @return booolean true if valid date; false, otherwise
*/
public static boolean isValidDate(int year, int month, int day){
return(year > 1900 && year <= 2100 && month > 0 && month < 13 && day > 0
&& day < 32);
}
/**
* Check for leap year
*
* @param year int (>= 1900 and <= 2100)
* @return boolean true if leap year; false, otherwise
*/
private boolean isLeapYear(int year){
return(year % 4 == 0 && year % 100 !=0 || year % 400 == 0);
}
/**
* Compute the number of days in a valid month of a valid year
*
* @param year int (>= 1900 and <= 2100)
* @param month int (range 1-12)
* @return int the number of days in the given month of the year
*/
private int numDays(int year, int month, int day){
int daysInMonth = 0;
switch (month){
case 1: daysInMonth = 31; break;
case 2: if(isLeapYear(year))
daysInMonth = 29;
else
daysInMonth = 28;
break;
case 3: daysInMonth = 31; break;
case 4: daysInMonth = 30; break;
case 5: daysInMonth = 31; break;
case 6: daysInMonth = 30; break;
case 7: daysInMonth = 31; break;
case 8: daysInMonth = 31; break;
case 9: daysInMonth = 30; break;
case 10: daysInMonth = 31; break;
case 11: daysInMonth = 30; break;
case 12: daysInMonth = 31; break;
}
return daysInMonth;
}
/**
* Compute the day of the year for a valid date
*
* @param year int (>= 1900 and <= 2100)
* @param month int (range 1-12)
* @param day int (range 1-numDays(year, month))
* @return int the day of the year
*/
public int dayOfYear(int year,int month,int day){
int dayOfYear = day;
if(isLeapYear(year)){
switch (month){
case 1:
dayOfYear = day; break;
case 2:
dayOfYear += 31; break;
case 3:
dayOfYear += 60; break;
case 4:
dayOfYear += 91; break;
case 5:
dayOfYear += 121; break;
case 6:
dayOfYear += 152; break;
case 7:
dayOfYear += 182; break;
case 8:
dayOfYear += 213; break;
case 9:
dayOfYear += 244; break;
case 10:
dayOfYear += 274; break;
case 11:
dayOfYear += 305; break;
case 12:
dayOfYear += 335; break;
}}
else{
switch (month){
case 1:
dayOfYear = day; break;
case 2:
dayOfYear += 31; break;
case 3:
dayOfYear += 59; break;
case 4:
dayOfYear += 90; break;
case 5:
dayOfYear += 120; break;
case 6:
dayOfYear += 151; break;
case 7:
dayOfYear += 181; break;
case 8:
dayOfYear += 212; break;
case 9:
dayOfYear += 243; break;
case 10:
dayOfYear += 273; break;
case 11:
dayOfYear += 304; break;
case 12:
dayOfYear += 334; break;
}}
return dayOfYear;
}
/**
* Compute the day of the week for a valid date
*
* @param year int (>= 1900 and <= 2100)
* @param month int (range 1-12)
* @param day int (range 1-numDays(year, month))
* @return String the day of the week
*/
public String dayOfWeek(int year, int month, int day, String t){
int m=month;
int y=year;
int d=day;
if (month > 3){
m += 12;
y -= 1;
}
int y0 = y - (14 - m) / 12;
int x = y0 + y0/4 - y0/100 + y0/400;
int m0 = m + 12 * ((14 - m) / 12) - 2;
int dayOfWeek = (d + x + (31*m0)/12) % 7;
switch (dayOfWeek) {
case 0:
t = "Sunday";
case 1:
t = "Monday";
case 2:
t = "Tuesday";
case 3:
t = "Wednesday";
case 4:
t = "Thursday";
case 5:
t = "Friday";
case 6:
t = "Saturday";
}
return t;
}
}
编辑:请原谅我的马虎代码，我正在上初学者计算机科学类(class)。谢谢大家的回复!
最佳答案
如果它是一个方法，那么你应该编写 MyCalendar.dayOfWeek() 和 MyCalendar.dayOfYear()，不是吗？如果它们是变量，则检查它们在 MyCalendar 中是否是公共(public)的。
编辑: 另外，您可能想要执行类似 test1.dayOfWeek() 的操作，因为您创建了 MyCalendar 的实例。正如有人在评论中写道，如果您也向我们展示 MyCalendar 类，那就更好了。
关于java - 在其他类中找不到符号//变量，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54845302/