help me to understand java code (calendar java code) ?

[so0oma]

hi
i need some one explain java code (calendar java code)
i study java now .... and i hava final lap exam tomoroow
this is my code

PHP Code:

import javax.swing.*;  
 import java.util.*;  
 import java.text.*;  

   public class EnglishCalendar   
      {       
          public static String[] months = {  
           "January" , "February" , "March",  
           "April" , "May" , "June",  
           "July" , "August" , "September",  
            "October" , "November" , "December" 
           };  
       public static int days[] = {  
         31, 28, 31,  
         30, 31, 30,
         31, 31, 30,  
         31, 30, 31 
        };  

        private void showMonth(int m, int y) {  
        int lead_spaces = 0;  
          if (m < 0 || m > 11) {  
        System.out.println("It should be 1 to 12");  
            }  
         else {  
             System.out.println();  
             System.out.println("    " + months[m] + " " + y);  
             System.out.println();  
             GregorianCalendar cal = new GregorianCalendar(y, m, 0);  
             System.out.println("Su Mo Tu We Th Fr Sa ");  
             lead_spaces = cal.get(Calendar.DAY_OF_WEEK);  
             int day_of_month = days[m];  
             if (cal.isLeapYear(cal.get(Calendar.YEAR)) && m == 1){ day_of_month++;}  
             for (int i = 0; i < lead_spaces; i++) {  
                 System.out.print("   ");  
                  }  
             for (int i = 1; i <= day_of_month; i++) {  
                if (i < 10) System.out.print(" ");  
                  System.out.print(i);  
                if ((lead_spaces  + i) % 7 == 0) {  
                   System.out.println();  
                     }   
                   else {
                   System.out.print(" ");  
                }  } 
             System.out.println();   }  }  
      
      private static void doSimpleDateFormat() {  
        Calendar now = Calendar.getInstance();  
        SimpleDateFormat formatter = new SimpleDateFormat("E yyyy.MM.dd 'at' hh:mm:ss a zzz");  
        System.out.print(" \n It is now : " + formatter.format(now.getTime()));  
         System.out.println();  
              }  
        public static void main(String[] args) {  
            String mo = JOptionPane.showInputDialog("Month");  
            String ye = JOptionPane.showInputDialog("Year");  
            int mon = new Integer(mo).intValue();  
            int yea = new Integer(ye).intValue();  
              EnglishCalendar k = new EnglishCalendar();  
                  k.showMonth(mon - 1 , yea);  
             doSimpleDateFormat();  
}  

   } 


i hope any one explain the code above and how it is execute

[EINSTEIN_007]

The main purpose of Calendar is to represent the GMT in various Calendars , various TimeZones. By default Gegorian Calendar is being used all over the world.

Please follow the below snippet to understand
————————————————-
System.out.println(“________________________All about Calendar Classes________________________________________”);
//By default it will get the Gegorian Calendar and intialize with the current datetime related to the default timezone in which you are
Calendar c2 = Calendar.getInstance();
System.out.println(c2.getTimeZone().getDisplayName());
System.out.println(c2.get(Calendar.HOUR));
System.out.println(c2.get(Calendar.MINUTE));
System.out.println(“c2 =”+c2.getTimeInMillis());

//Using Calendar Object to Convert date from one TimeZone to another TimeZone
Calendar c3 = Calendar.getInstance(TimeZone.getTimeZone(“America/Los_Angeles”));
c3.setTimeInMillis(c2.getTimeInMillis());
System.out.println(c3.getTimeZone().getDisplayName());
System.out.println(c3.get(Calendar.HOUR));
System.out.println(c3.get(Calendar.MINUTE));
System.out.println(“c3 =”+c3.getTimeInMillis());

Locale
——–
One of the Locale Object Constructor is Locale(language,Country);
Locale is used to capture the Locality information of where the user is being present.
new Locale(‘en’,'IN’) //represents the Locale object intialized with the India Locality.
there is default locale object which is being intialized at the start of the JVM.
This locale object is being used when displaying the local sensitive information such as date and others.

new SimpleDateFormat(“pattern”,new Locale(language,CountryCode));
the above format is being used to display the date in the pattern which was given in the constructor
while displaying this SimpleDateFormat also considers the Locale Object too to display the same pattern as per the taste
of local people.

Code snippet
—————
Date d = new Date(); //created the date object
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy.MM.dd G ‘at’ HH:mm:ss Z”,l2);
System.out.println(“In the present Time Zone”);
System.out.println(sdf.format(d));

[so0oma]

thank you for help
but if you can explain this :

import javax.swing.*;   
 import java.util.*;   
 import java.text.*;   

and tow method below:

PHP Code:

public class EnglishCalendar    
      {        
          public static String[] months = {   
           "January" , "February" , "March",   
           "April" , "May" , "June",   
           "July" , "August" , "September",   
            "October" , "November" , "December"  
           };   
              private void showMonth(int m, int y) {   
        int lead_spaces = 0;   
          if (m < 0 || m > 11) {   
        System.out.println("It should be 1 to 12");   
            }   
         else {   
             System.out.println();   
             System.out.println("    " + months[m] + " " + y);   
             System.out.println();   
             GregorianCalendar cal = new GregorianCalendar(y, m, 0);   
             System.out.println("Su Mo Tu We Th Fr Sa ");   
             lead_spaces = cal.get(Calendar.DAY_OF_WEEK);   
             int day_of_month = days[m];   
             if (cal.isLeapYear(cal.get(Calendar.YEAR)) && m == 1){ day_of_month++;}   
             for (int i = 0; i < lead_spaces; i++) {   
                 System.out.print("   ");   
                  }   
             for (int i = 1; i <= day_of_month; i++) {   
                if (i < 10) System.out.print(" ");   
                  System.out.print(i);   
                if ((lead_spaces  + i) % 7 == 0) {   
                   System.out.println();   
                     }    
                   else { 
                   System.out.print(" ");   
                }  }  
             System.out.println();   }  } 


thanks so mutch ^_^