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// from http://javahungry.blogspot.com/2013/06/calendar-implementation-gui-based.html

static JLabel lblMonth, lblYear;

static JButton btnPrev, btnNext;

static JTable tblCalendar;

static JComboBox cmbYear;

static JFrame frmMain;

static Container pane;

static DefaultTableModel mtblCalendar; //Table model

static JScrollPane stblCalendar; //The scrollpane

static JPanel pnlCalendar;

static int realYear, realMonth, realDay, currentYear, currentMonth;

p {

    //Prepare frame

    frmMain = new JFrame ("Gestionnaire de clients"); //Create frame

    frmMain.setSize(330, 375); //Set size to 400x400 pixels

    pane = frmMain.getContentPane(); //Get content pane

    pane.setLayout(null); //Apply null layout

    frmMain.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Close when X is clicked

    //Create controls

    lblMonth = new JLabel ("January");

    lblYear = new JLabel ("Change year:");

    cmbYear = new JComboBox();

    btnPrev = new JButton ("<<");

    btnNext = new JButton (">>");

    mtblCalendar = new DefaultTableModel(){public boolean isCellEditable(int rowIndex, int mColIndex){return false;}};

    tblCalendar = new JTable(mtblCalendar);

    stblCalendar = new JScrollPane(tblCalendar);

    pnlCalendar = new JPanel(null);

    //Set border

    pnlCalendar.setBorder(BorderFactory.createTitledBorder("Calendar"));

    //Register action listeners

    btnPrev.addActionListener(new btnPrev_Action());

    btnNext.addActionListener(new btnNext_Action());

    cmbYear.addActionListener(new cmbYear_Action());

    //Add controls to pane

    pane.add(pnlCalendar);

    pnlCalendar.add(lblMonth);

    pnlCalendar.add(lblYear);

    pnlCalendar.add(cmbYear);

    pnlCalendar.add(btnPrev);

    pnlCalendar.add(btnNext);

    pnlCalendar.add(stblCalendar);

    //Set bounds

    pnlCalendar.setBounds(0, 0, 320, 335);

    lblMonth.setBounds(160-lblMonth.getPreferredSize().width/2, 25, 100, 25);

    lblYear.setBounds(10, 305, 80, 20);

    cmbYear.setBounds(230, 305, 80, 20);

    btnPrev.setBounds(10, 25, 50, 25);

    btnNext.setBounds(260, 25, 50, 25);

    stblCalendar.setBounds(10, 50, 300, 250);

    //Make frame visible

    frmMain.setResizable(false);

    frmMain.setVisible(true);

    //Get real month/year

    GregorianCalendar cal = new GregorianCalendar(); //Create calendar

    realDay = cal.get(GregorianCalendar.DAY_OF_MONTH); //Get day

    realMonth = cal.get(GregorianCalendar.MONTH); //Get month

    realYear = cal.get(GregorianCalendar.YEAR); //Get year

    currentMonth = realMonth; //Match month and year

    currentYear = realYear;

    //Add headers

    String[] headers = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}; //All headers

    for (int i=0; i<7; i++){

        mtblCalendar.addColumn(headers[i]);

    }

    tblCalendar.getParent().setBackground(tblCalendar.getBackground()); //Set background

    //No resize/reorder

    tblCalendar.getTableHeader().setResizingAllowed(false);

    tblCalendar.getTableHeader().setReorderingAllowed(false);

    //Single cell selection

    tblCalendar.setColumnSelectionAllowed(true);

    tblCalendar.setRowSelectionAllowed(true);

    tblCalendar.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

    //Set row/column count

    tblCalendar.setRowHeight(38);

    mtblCalendar.setColumnCount(7);

    mtblCalendar.setRowCount(6);

    //Populate table

    for (int i=realYear-100; i<=realYear+100; i++){

        cmbYear.addItem(String.valueOf(i));

    }

    //Refresh calendar

    refreshCalendar (realMonth, realYear); //Refresh calendar

}

public static void refreshCalendar(int month, int year){

    //Variables

    String[] months =  {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};

    int nod, som; //Number Of Days, Start Of Month

    //Allow/disallow buttons

    btnPrev.setEnabled(true);

    btnNext.setEnabled(true);

    if (month == 0 && year <= realYear-10){btnPrev.setEnabled(false);} //Too early

    if (month == 11 && year >= realYear+100){btnNext.setEnabled(false);} //Too late

    lblMonth.setText(months[month]); //Refresh the month label (at the top)

    lblMonth.setBounds(160-lblMonth.getPreferredSize().width/2, 25, 180, 25); //Re-align label with calendar

    cmbYear.setSelectedItem(String.valueOf(year)); //Select the correct year in the combo box

    //Clear table

    for (int i=0; i<6; i++){

        for (int j=0; j<7; j++){

            mtblCalendar.setValueAt(null, i, j);

        }

    }

    //Get first day of month and number of days

    GregorianCalendar cal = new GregorianCalendar(year, month, 1);

    nod = cal.getActualMaximum(GregorianCalendar.DAY_OF_MONTH);

    som = cal.get(GregorianCalendar.DAY_OF_WEEK);

    //Draw calendar

    for (int i=1; i<=nod; i++){

        int row = new Integer((i+som-2)/7);

        int column  =  (i+som-2)%7;

        mtblCalendar.setValueAt(i, row, column);

    }

    //Apply renderers

    tblCalendar.setDefaultRenderer(tblCalendar.getColumnClass(0), new tblCalendarRenderer());

}

static class tblCalendarRenderer extends DefaultTableCellRenderer{

    public Component getTableCellRendererComponent (JTable table, Object value, boolean selected, boolean focused, int row, int column){

        super.getTableCellRendererComponent(table, value, selected, focused, row, column);

        if (column == 0 || column == 6){ //Week-end

            setBackground(new Color(255, 220, 220));

        }

        else{ //Week

            setBackground(new Color(255, 255, 255));

        }

        if (value != null){

            if (Integer.parseInt(value.toString()) == realDay && currentMonth == realMonth && currentYear == realYear){ //Today

                setBackground(new Color(220, 220, 255));

            }

        }

        setBorder(null);

        setForeground(Color.black);

        return this;

    }

}

static class btnPrev_Action implements ActionListener{

    public void actionPerformed (ActionEvent e){

        if (currentMonth == 0){ //Back one year

            currentMonth = 11;

            currentYear -= 1;

        }

        else{ //Back one month

            currentMonth -= 1;

        }

        refreshCalendar(currentMonth, currentYear);

    }

}

static class btnNext_Action implements ActionListener{

    public void actionPerformed (ActionEvent e){

        if (currentMonth == 11){ //Foward one year

            currentMonth = 0;

            currentYear += 1;

        }

        else{ //Foward one month

            currentMonth += 1;

        }

        refreshCalendar(currentMonth, currentYear);

    }

}

static class cmbYear_Action implements ActionListener{

    public void actionPerformed (ActionEvent e){

        if (cmbYear.getSelectedItem() != null){

            String b = cmbYear.getSelectedItem().toString();

            currentYear = Integer.parseInt(b);

            refreshCalendar(currentMonth, currentYear);

        }

    }

}