import java.text.DateFormatSymbols;
import java.util.Calendar;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;

public class Task5 extends AbstractTableModel{
	  int column;
	  int row;
	  Integer days[][];
	  Calendar calendar;
	  String[] dayNames;
	  int year;
	  int month;
	  
	  public Task5(int year, int month){
	    set(year, month);
	  }
	  
	  public void set(int year, int month){
	    this.year = year;
	    this.month = month;
	    init();
	    fireTableStructureChanged();
	  }
	  
	  private void init(){
	    calendar = Calendar.getInstance();
	    calendar.setMinimalDaysInFirstWeek(7);
	    calendar.clear();
	    calendar.set(Calendar.YEAR, year);
	    calendar.set(Calendar.MONTH, month);
	    column = calendar.getActualMaximum(Calendar.DAY_OF_WEEK) - calendar.getActualMinimum(Calendar.DAY_OF_WEEK) + 1;
	    row = calendar.getActualMaximum(Calendar.WEEK_OF_MONTH) - calendar.getActualMinimum(Calendar.WEEK_OF_MONTH) + 1;
	    days = new Integer[row][column];
	    dayNames = new String[column];
	    int currDay = calendar.getFirstDayOfWeek();
	    String[] d = new DateFormatSymbols().getShortWeekdays();
	    for(int i = 0; i < dayNames.length; i++){
	      dayNames[i] = d[currDay];
	      currDay++;
	      if(currDay > calendar.getActualMaximum(Calendar.DAY_OF_WEEK))
	        currDay = calendar.getActualMinimum(Calendar.DAY_OF_WEEK);
	    }	    
	    calendar.set(Calendar.WEEK_OF_MONTH, calendar.getActualMinimum(Calendar.WEEK_OF_MONTH));
	    calendar.set(Calendar.DAY_OF_WEEK, calendar.getFirstDayOfWeek());
	    for(int r = 0; r < row; r++){
	      for(int c = 0; c < column; c++){
	        if(calendar.get(Calendar.MONTH) == month){
	          days[r][c] = calendar.get(Calendar.DAY_OF_MONTH);
	        } else days[r][c] = null;        
	        calendar.add(Calendar.DAY_OF_YEAR, 1);
	      }
	    }
	  }
	  
	  public Object getValueAt(int rowIndex, int columnIndex){
	    return days[rowIndex][columnIndex];
	  }
	  
	  public Class getColumnClass(int columnIndex){
	    return Integer.class;
	  }
	  
	  public int getRowCount(){
	    return row;
	  }
	  
	  public int getColumnCount(){
	    return column;
	  }
	  
	  public String getColumnName(int columnIndex){
	    return dayNames[columnIndex];
	  }
	  
	  public static void main(String[] args){
	    Task5 model = new Task5(2013, Calendar.AUGUST);
	    JFrame frame = new JFrame();
	    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    frame.getContentPane().add(new JScrollPane(new JTable(model)));
	    frame.pack();
	    frame.setLocationRelativeTo(null);
	    frame.setVisible(true);
	  }
}