Lightweight Example: DayTable

class DayTable extends Component implements MouseListener 
{ 
  Date            CurDate; 
  int[][]         DayArray; 
  FontMetrics     Fm; 
  DatePane        Master; 
  static int[]    MonthLen = { 31,28,31,30,31,30,31,31,30,31,30,31 }; 
  static String[] DayShorts = {"Mo","Tu","We","Th","Fr","Sa","Su" }; 
  
  public DayTable ( DatePane master ) { 
    Font font = new Font( "Helvetica", Font.BOLD, 12); 
    setFont( font); 
    Fm = getToolkit().getFontMetrics( font); 
    Master = master; 
    addMouseListener( this); 
  } 

  public void mousePressed ( MouseEvent e ) { 
    Dimension size = getSize(); 
    int x = e.getX(); 
    int y = e.getY(); 
    int cw  = 2*Fm.charWidth( '0'); 
    int cd  = (size.width-7*cw)/8; 
    int rh  = Fm.getHeight(); 
    int rd  = (size.height-7*rh)/8; 
    int xIdx = Math.min( x / (cw+cd), 6); 
    int yIdx = Math.min( (y-rh-rd) / (rh+rd), 5 ); 
    int dn; 
    Graphics g; 

    if ( (dn=DayArray[xIdx][yIdx]) != 0) { 
      CurDate.setDate( dn); 
      if ( (g = getGraphics()) != null ) { 
        redraw( g); 
        g.dispose(); 
      } 
    } 

    Master.notifyClients(); 
  } 
  
  public void redraw ( Graphics g) { 
    if ( CurDate == null ) return; 
  
    Dimension size = getSize(); 
    int zw  = Fm.charWidth( '0'); 
    int cw  = 2*zw; 
    int cd  = (size.width-7*cw)/8; 
    int dc  = Fm.getDescent(); 
    int rh  = Fm.getHeight(); 
    int rd  = (size.height-7*rh)/8; 
    int dn, dof, dim = CurDate.getDate(); 
  
    g.setColor( Color.blue); 
    g.setFont( getFont() ); 
    for ( int dy=0; dy<7; dy++) 
      g.drawString( DayShorts[dy], cd+dy*(cw+cd), rd+rh-dc); 
  
    for ( int dy=0; dy<7; dy++) { 
      for ( int wk=0; wk<6; wk++) { 
        if ( (dn=DayArray[dy][wk]) != 0 ){ 
          if ( dn<10) dof=zw; 
          else        dof = 0; 
          if (dn==dim) g.setColor( Color.green); 
          else if ( dy==6) g.setColor( Color.red); 
          else g.setColor( Color.black); 
          g.drawString( Integer.toString(dn),
                        dof+cd+dy*(cd+cw), (wk+2)*(rd+rh)-dc ); 
        } 
      } 
    } 
  } 

  public void paint ( Graphics g ) { 
    Dimension size = getSize(); 
    g.setColor( getBackground()); 
    g.fillRect( 0, 0, size.width, size.height); 

    redraw( g); 
  } 

  public static int[][] getDayArray ( int mn, int ye) { 
    int[][] darr = new int[7][6]; 
    int sd = (new Date( ye, mn-1, 1)).getDay(); 
    int maxd = MonthLen[mn-1]; 

    if ( (mn==2) && (isLeapYear( ye)) ) maxd++; 
    if ( sd == 0) sd = 7; 

    for( int day=sd-1; day < maxd+sd-1; day++) 
      darr[day%7][day/7] = day-sd+2; 

    return darr; 
  }

  public Date getDate () { 
    return CurDate; 
  } 

  void setDate ( Date dt ) { 
    CurDate = dt; 
    DayArray = getDayArray( dt.getMonth()+1, dt.getYear() ); 
    repaint(); 
  } 
  
  public void mouseClicked ( MouseEvent e ) {} 
  public void mouseReleased ( MouseEvent e ) {} 
  public void mouseEntered ( MouseEvent e ) {} 
  public void mouseExited ( MouseEvent e ) {} 

  public static boolean isLeapYear ( int year) { 
    if ( year % 400 == 0 )      return true; 
    if ( year % 100 == 0 )      return false; 
    return (year % 4) == 0; 
  }
}