2 列 Java 控制台日历

Question

大家好，我真的需要你们的帮助。我需要以 3 列输出 3 年日历。第一列中的年份应该是用户输入的年份。

我有一个代码，可以发布 3 年日历，但仅在 1 列中。我需要在另一列中分隔另一年，请帮助我

package project;

import java.util.*;

public class les1 {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Calendar cal = Calendar.getInstance();
        String ans;
        // getting the system calendar's year, maximum days,
        // weeks per month and system calendar's month.
        int year = cal.get(Calendar.YEAR);
        int day = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        int week = cal.get(Calendar.DAY_OF_WEEK);
        int month = cal.get(Calendar.MONTH);
        int col[] = new int[3];

        do {
            // validation for input year

            do {
                System.out.print("\nEnter year: ");
                while (true)
                    try {
                        year = Integer.parseInt(in.next());
                        break;
                    } catch (Exception ex) {
                        System.out.println("Try again!");
                        System.out.print("\nEnter year: ");
                    }
                if (year < 1900 || year > 2099) {
                    System.out.println("Try again!");
                }
            } while (year < 1900 || year > 2099);

            /*
             * System.out.println("enter number of elements");
             * 
             * int n = in.nextInt();
             * 
             * int arr[] = new int[n];
             * 
             * for (int j = 0; j < n; j++) {// for reading array
             * 
             * }
             * 
             * for (int j : arr) {
             */
            // loop for months
                for (month = 1; month <= 1; month++) {
                    // calculating years, month, days and weeks.
                    int y = year - (14 - month) / 12;
                    int x = y + y / 4 - y / 100 + y / 400;
                    int m = month + 12 * ((14 - month) / 12) - 2;
                    int d = (1 + x + (31 * m) / 12) % 7;
                    // calculate leap year
                    boolean LeapYear = (year % 400 == 0);
                    // displaying month as String
                    cal.set(year, month, 0);
                        System.out
                                .print(cal.getDisplayName(Calendar.MONTH, Calendar.LONG, Locale.ENGLISH) + "\t\t\t\t\t\t");
                        System.out.print("Sun Mon Tue Wed Thu Fri Sat" + "\t\t\t");

                    int length = (int) (30 + ((month + (month / 8.0)) % 2));
                    if (month == 2) {
                        if (LeapYear) {
                            length -= 1;
                        } else {
                            length -= 2;
                        }
                    }

                    for (int a = 0; a < col.length; a++) {
                        int counter = 1;
                        // spacing for first day of the month
                        for (int i = 0; i < d; i++) {
                            System.out.print("    ");
                            counter++;
                        }
                        // spacing for days
                        for (day = 1; day <= length; day++) {
                            System.out.printf("%2d", day);
                            System.out.print((counter++ % 7 != 0) ? "  " : "\n");
                        }
                    }
                    week = (week + length) % 6;
                }
            year++;
            /* } */
            System.out.print("\n\n" + "Enter another year (Y/N)? ");
            ans = in.next();
        } while (ans.equals("Y") || ans.equals("y"));
        System.out.println("\nEnd!");
        in.close();
    }
}

Answer 1

看一下下面的代码。它将在三列中打印三个不同年份的日历。我用过this确定任何月份中星期几的公式。

 import java.util.*;

 public class les1 {

 public static void main(String[] args) {

    String[] days = {
        "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
    };
    Scanner in = new Scanner(System. in );
    Calendar cal = Calendar.getInstance();
    String ans;
    int year = cal.get(Calendar.YEAR);
    int day = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
    int week = cal.get(Calendar.DAY_OF_WEEK);
    int month = cal.get(Calendar.MONTH);
    int col[] = new int[3];

    do {
        // validation for input year

        do {
            System.out.print("\nEnter year: ");
            while (true)
            try {
                year = Integer.parseInt( in .next());
                break;
            } catch (Exception ex) {
                System.out.println("Try again!");
                System.out.print("\nEnter year: ");
            }
            if (year < 1900 || year > 2099) {
                System.out.println("Try again!");
            }
        } while (year < 1900 || year > 2099);

        for (month = 1; month <= 1; month++) {


            HashMap < Integer, Integer > map = new HashMap < Integer, Integer > ();
            map.put(1, 0);
            map.put(7, 6);
            map.put(2, 3);
            map.put(8, 2);
            map.put(3, 3);
            map.put(9, 5);
            map.put(4, 6);
            map.put(10, 0);
            map.put(5, 1);
            map.put(11, 3);
            map.put(6, 4);
            map.put(12, 5);

            System.out.println();

            for (int a = 0; a < col.length; a++) {
                int counter = 1;
                System.out.printf("%-6s%-6s%-6s%-6s%-6s%-6s%-6s", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat");
                System.out.printf("\t\t\t"); //Formatting for days

            }
            // System.out.println();

            // calculate leap year
            boolean LeapYear = false;
            if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) LeapYear = true;
            // displaying month as String

            ArrayList < Integer > dds = new ArrayList < Integer > ();
            dds.add(0);
            dds.add(0);
            dds.add(0);
            dds.add(0);
            int indexofA = 0;

            String yy = year + "";

            int m;
            if (LeapYear && month == 1) m = map.get(month) + 6;
            else if (LeapYear && month == 2) m = map.get(month) - 1;
            else m = map.get(month);

            int y = Integer.parseInt(yy.substring(2, 4));
            int c = (year / 100);
            if (c % 4 == 0) c = 6;
            else if (c % 4 == 1) c = 4;
            else if (c % 4 == 2) c = 2;
            else c = 0;
            int x = y + y / 4 + c;
            int d = (1 + x + m) % 7;
            // cal.set(year, month, 0);

            int length = (int)(30 + ((month + (month / 8.0)) % 2));
            if (month == 2) {
                if (LeapYear) {
                    length -= 1;
                } else {
                    length -= 2;
                }
            }
            System.out.print("len : " + length);
            System.out.println();
            boolean thirtyone = false;
            int count = 0;
            for (int r = 0; r < 6; r++) { //For each row of the calendars

                String[] dayss = new String[7];

                int index = 0;

                for (int a = 0; a < col.length; a++) { //For each column of a calendar

                    for (int i = 0; i < d && dds.get(indexofA) == 0; i++) {

                        dayss[index] = " ";
                        index++;
                    }

                    for (day = dds.get(indexofA) + 1; day <= length; day++) {
                        if (day == 31) {
                            dayss[index] = day + "";
                            index++;
                            thirtyone = true;

                        } else if (day < 31) {
                            dayss[index] = day + "";
                            index++;
                        }

                        if (index == 7) {
                            dds.set(indexofA, day);
                            break;
                        }

                    }

                    indexofA++;
                    System.out.printf("%-6s%-6s%-6s%-6s%-6s%-6s%-6s", dayss[0], dayss[1], dayss[2], dayss[3],
                    dayss[4], dayss[5], dayss[6]);
                    System.out.printf("\t\t\t");

                    index = 0;
                    year++;
                    LeapYear = false;
                    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) LeapYear = true;
                    yy = year + "";
                    if (LeapYear && month == 1) m = map.get(month) + 6;
                    else if (LeapYear && month == 2) m = map.get(month) - 1;
                    else m = map.get(month);

                    y = Integer.parseInt(yy.substring(2, 4));
                    c = (year / 100);
                    if (c % 4 == 0) c = 6;
                    else if (c % 4 == 1) c = 4;
                    else if (c % 4 == 2) c = 2;
                    else c = 0;
                    x = y + y / 4 + c;
                    d = (1 + x + m) % 7;

                }
                year -= 3;
                yy = year + "";
                LeapYear = false;
                if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) LeapYear = true;

                if (LeapYear && month == 1) m = map.get(month) + 6;
                else if (LeapYear && month == 2) m = map.get(month) - 1;
                else m = map.get(month);

                y = Integer.parseInt(yy.substring(2, 4));
                c = (year / 100);
                if (c % 4 == 0) c = 6;
                else if (c % 4 == 1) c = 4;
                else if (c % 4 == 2) c = 2;
                else c = 0;
                x = y + y / 4 + c;
                d = (1 + x + m) % 7;

                indexofA = 0;
                System.out.println();

            }

        }
        System.out.print("\n\n" + "Enter another year (Y/N)? ");
        ans = in .next();
    } while (ans.equals("Y") || ans.equals("y"));
    System.out.println("\nEnd!"); in .close();
}

}