Java Program to Generate Calendar of Any Year Without calendar.get() Function

19 Aug, 2021
Java program for generating the calendar of any desired year and month let us first go through an illustration before landing upon logic and procedural part.
Illustration:
Say the user wants to get the calendar of April 2011. Then, he is required to enter the year along with the month as integers and the output would return the desired month’s calendar for the respective year in a proper format.
Procedure:
Step 1: Take the year and the month as integer inputs from the user
Step 2: Create 2 arrays as follows, one for storing days and the other for storing the months, as per proper order.
String day[]   = { "SUN","MON","TUE","WED","THU","FRI","SAT" } ;  
String month[] = { "JANUARY","FEBRUARY","MARCH","APRIL","MAY","JUNE","JULY","AUGUST","SEPTEMBER","OCTOBER","NOVEMBER","DECEMBER" } ; 
Step 3: Initialize a counter variable and three variables, each for the day, month, and year as 1, and a separate array for storing the different combinations of days on which months can be found. Eg. 31,30,29
int ar[] = { 31,29,31,30,31,30,31,31,30,31,30,31 } ;
Step 4: Check the leap year condition and re-initialize values for the above array.
if(y%4==0&&y%100!=0||y%100==0)
ar[1]=29;                       // if the year is a leap year then store 29 for the month of february
else  
ar[1]=28;                       // else 28 
Step 5: Increment year count as month count reaches 12 and increment month count as day count reaches a value greater than that present in the array for the respective index
Step 6: Print the result.
Implementation:
Example
Java
// Java Program to Generate Desired Calendar// Without calendar.get() function or// Inputting the Year and the Month  // Importing required classesimport java.io.*;import java.util.Scanner;  // Main classpublic class GFG {      // Main driver method    public static void main(String a[])    {          // Reading input by creating object of Scanner class        Scanner sc = new Scanner(System.in);          // Display message only        System.out.print("Enter the year : ");          // Reading integer input value        int yy = sc.nextInt();          // Display message only        System.out.print("Enter month : ");          // Reading integer input value        int mm = sc.nextInt();          int d = 1;        int m = 1;        int y = 1;        int dy = 1;          // Storing data and months as input        String day[] = { "SUN", "MON", "TUE", "WED",                         "THU", "FRI", "SAT" };        String month[]            = { "JANUARY", "FEBRUARY", "MARCH",                "APRIL",   "MAY",      "JUNE",                "JULY",    "AUGUST",   "SEPTEMBER",                "OCTOBER", "NOVEMBER", "DECEMBER" };          // Custom array as input        int ar[] = { 31, 29, 31, 30, 31, 30,                     31, 31, 30, 31, 30, 31 };          // Till condition holds true        while (true) {              if (d == 1 && m == mm && y == yy) {                break;            }              if (y % 4 == 0 && y % 100 != 0                || y % 100 == 0) {                ar[1] = 29;            }              else {                ar[1] = 28;            }            dy++;            d++;              if (d > ar[m - 1]) {                m++;                d = 1;            }              if (m > 12) {                m = 1;                y++;            }              if (dy == 7) {                dy = 0;            }        }          int c = dy;          if (y % 4 == 0 && y % 100 != 0 || y % 400 == 0) {            ar[1] = 29;        }        else {            ar[1] = 28;        }          // Print the desired month of input year        System.out.println("MONTH:" + month[mm - 1]);          for (int k = 0; k < 7; k++) {            System.out.print("   " + day[k]);        }          System.out.println();          for (int j = 1; j <= (ar[mm - 1] + dy); j++) {            if (j > 6) {                dy = dy % 6;            }        }          int spaces = dy;        if (spaces < 0)            spaces = 6;          // Printing the calendar        for (int i = 0; i < spaces; i++)            System.out.print("      ");        for (int i = 1; i <= ar[mm - 1]; i++) {            System.out.printf(" %4d ", i);              if (((i + spaces) % 7 == 0)                || (i == ar[mm - 1]))                System.out.println();        }    }}
Output: 
 
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