Program java Kalender

import java.util.*;
public class yearCalendar
    {
        public static void yearCalendar(int year)
            {
                GregorianCalendar a = new GregorianCalendar();
                int today = a.get(GregorianCalendar.DAY_OF_MONTH);
                int month1 = a.get(GregorianCalendar.MONTH);
                int year1 = a.get(GregorianCalendar.YEAR);
                a.set(GregorianCalendar.YEAR,year);
                System.out.println();
                System.out.println("    YEAR : "+year);
                for(int i=0;i<12;i++)
                    {
                        a.set(GregorianCalendar.MONTH,i);
                        a.set(GregorianCalendar.DAY_OF_MONTH,1);
                        int month = a.get(GregorianCalendar.MONTH);
                        int weekday = a.get(GregorianCalendar.DAY_OF_WEEK);
                        switch(month)
                    {
                        case 0:
                        System.out.println();
                        System.out.println("        JANUARY            ");
                        System.out.println();
                        break;
                        case 1:
                        System.out.println();
                        System.out.println("        FEBRUARY           ");
                        System.out.println();
                        break;
                        case 2:
                        System.out.println();
                        System.out.println("         MARCH            ");
                        System.out.println();
                        break;
                        case 3:
                        System.out.println();
                        System.out.println("         APRIL           ");
                        System.out.println();
                        break;
                        case 4:
                        System.out.println();
                        System.out.println("          MAY            ");
                        System.out.println();
                        break;
                        case 5:
                        System.out.println();
                        System.out.println("          JUNE          ");
                        System.out.println();
                        break;
                        case 6:
                        System.out.println();
                        System.out.println("          JULY            ");
                        System.out.println();
                        break;
                        case 7:
                        System.out.println();
                        System.out.println("         AUGUST           ");
                        System.out.println();
                        break;
                        case 8:
                        System.out.println();
                        System.out.println("       SEPTEMBER            ");
                        System.out.println();
                        break;
                        case 9:
                        System.out.println();
                        System.out.println("        OCTOBER           ");
                        System.out.println();
                        break;
                        case 10:
                        System.out.println();
                        System.out.println("        NOVEMBER            ");
                        System.out.println();
                        break;
                        case 11:
                        System.out.println();
                        System.out.println("        DECEMBER           ");
                        System.out.println();
                        break;
              }
                        System.out.println("Sun Mon Tue Wed Thu Fri Sat");
                        for(int j=GregorianCalendar.SUNDAY; j<weekday;j++)
                            {
                                System.out.print("    ");
                            }
                        do
                            {  
                         int day = a.get(GregorianCalendar.DAY_OF_MONTH);
                          if(day<10)
                                    {
                                        System.out.print(" "+day);
                                    }
                                   
                                else if(day>=10)
                                    {
                                        System.out.print(day);
                                    }
                                    if(day == today&&month1 == month&&year == year1)
                System.out.print("* ");
                else
                System.out.print("  ");
                                 if(weekday == GregorianCalendar.SATURDAY)
                                    {
                                        System.out.println();
                                    }
                                a.add(GregorianCalendar.DAY_OF_MONTH,1);
                                weekday = a.get(GregorianCalendar.DAY_OF_WEEK);
                            }
                      while(a.get(GregorianCalendar.MONTH) == month);
                    if(weekday != GregorianCalendar.SUNDAY)
                    {
                   System.out.println();
                     }
                    }
                    System.out.println();
                System.out.println("Note : '*' over any digit is current date");
                System.out.println("If it is not displayed then year might not be current year");
                }
            }