Java程序，无需 calendar.get()函数即可生成任何年份的日历

产生任何所需的年份和月份的日历Java程序让我们先通过一个型插画比在逻辑和程序的一部分降落前。

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.

程序：

步骤1：将年和月作为用户的整数输入

第 2 步：按如下顺序创建 2 个数组，一个用于存储天数，另一个用于存储月份。

String day[]   = { "SUN","MON","TUE","WED","THU","FRI","SAT" } ;  
String month[] = { "JANUARY","FEBRUARY","MARCH","APRIL","MAY","JUNE","JULY","AUGUST","SEPTEMBER","OCTOBER","NOVEMBER","DECEMBER" } ; 

步骤3：初始化一个计数器变量和三个变量，分别代表日、月、年为1，以及一个单独的数组，用于存储可以找到月份的不同天数组合。例如。 31、30、29

int ar[] = { 31,29,31,30,31,30,31,31,30,31,30,31 } ;

第 4 步：检查闰年条件并重新初始化上述数组的值。

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 

第 5 步：当月数达到 12 时增加年数，当日数达到大于相应索引数组中的值时增加月数

第六步：打印结果。

执行：

例子

Java

// Java Program to Generate Desired Calendar
// Without calendar.get() function or
// Inputting the Year and the Month
  
// Importing required classes
import java.io.*;
import java.util.Scanner;
  
// Main class
public 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();
        }
    }
}

输出：