calendarpanel.java

This Project contain Calender Panel

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class CalendarPanel extends JPanel
    implements ActionListener
{

    public CalendarPanel()
    {
        l = new JLabel[40];
        l1 = new JLabel("Select the Month ");
        l2 = new JLabel("Of The Year ");
        l3 = new JLabel("   ");
        setLayout(new BorderLayout(4, 4));
        d = new JLabel[str.length];
        p1 = new JPanel();
        p2 = new JPanel();
        p3 = new JPanel();
        p4 = new JPanel();
        p1.setLayout(new FlowLayout());
        p2.setLayout(new GridLayout(7, 7));
        p3.setLayout(new FlowLayout());
        p4.setLayout(new BorderLayout());
        p4.add(p1, "North");
        p4.add(p3, "South");
        add(p4, "North");
        add(p2, "Center");
        setBackground(new Color(128,128,255));
        for(int i = 0; i < str.length; i++)
        {
            d[i] = new JLabel(str[i]);
            p2.add(d[i]);
        }

        for(int j = 1; j < 40; j++)
        {
            l[j] = new JLabel();
            p2.add(l[j]);
        }

        add(l3, "West");
        Font font = new Font("Sanserif", 1, 20);
        Font font1 = new Font("Sanserif", 2, 20);
        p1.setFont(font);
        p3.setFont(font);
        setFont(font1);
        b2 = new JButton("Exit");
        b2.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent actionevent)
            {
                System.exit(0);
            }

        });
        b2.setToolTipText("Press To Exit");
        b2.setBackground(Color.red);
        b2.setMnemonic('e');
        tf = new JTextField(5);
        ch1 = new JComboBox(mon);
        ch1.setBackground(new Color(128,0,255));
        ch2 = new JComboBox(per);
        ch2.setBackground(new Color(128,0,255));
        ch1.setMaximumRowCount(5);
        ch2.setMaximumRowCount(2);
        ch2.setToolTipText("The Zero Year Works For both A.D & B.C");
        ch1.addItemListener(new ItemListener() {

            public void itemStateChanged(ItemEvent itemevent)
            {
                if(itemevent.getStateChange() == 1)
                    m = ch1.getSelectedIndex();
            }

        });
        ch2.addItemListener(new ItemListener() {

            public void itemStateChanged(ItemEvent itemevent)
            {
                if(itemevent.getStateChange() == 1)
                    period = ch2.getSelectedIndex();
            }

        });
        b = new JButton("Show");
        b.setBackground(Color.green);
        p1.add(l1);
        p1.add(ch1);
        p1.add(l2);
        p1.add(tf);
        p1.add(ch2);
        p3.add(b);
        p3.add(b2);
        p1.setBackground(new Color(128,128,255));
        p2.setBackground(new Color(128,128,255));
        p3.setBackground(new Color(128,128,255));
        b.setMnemonic('s');
        b.setToolTipText("Press this button to show the Calendar");
        b.addActionListener(this);
    }

    static boolean isLeap(int i)
    {
        return i % 400 == 0 || i % 100 != 0 && i % 4 == 0;
    }

    static int yearStart(int i)
    {
        int j = 6;
        if(i >= 0)
        {
            for(int k = 0; k <= i; k++)
                if(isLeap(k - 1))
                {
                    if((j += 2) > 7)
                        j -= 7;
                } else
                if(++j > 7)
                    j -= 7;

        } else
        if(i < 0)
        {
            j++;
            for(int i1 = i; i1 < 0; i1++)
                if(isLeap(i1))
                {
                    if((j -= 2) < 0)
                        j += 7;
                } else
                if(--j < 0)
                    j += 7;

        }
        return j;
    }

    static int monthStart(int i, int j, int k)
    {
        int i1 = 0;
        if(k == 0)
            i1 = yearStart(j);
        if(k == 1)
            i1 = yearStart(-j);
        for(int j1 = 1; j1 <= i; j1++)
            if(j1 == 4 || j1 == 6 || j1 == 9 || j1 == 11)
            {
                if((i1 += 2) > 7)
                    i1 -= 7;
            } else
            if(j1 == 1 || j1 == 3 || j1 == 5 || j1 == 7 || j1 == 8 || j1 == 10)
            {
                if((i1 += 3) > 7)
                    i1 -= 7;
            } else
            if(j1 == 2)
                if(isLeap(j))
                    i1++;
                else
                    i1 += 0;

        return i1;
    }

    static int countDays(int i, int j)
    {
        byte byte0 = 0;
        if(i == 0 || i == 2 || i == 4 || i == 6 || i == 7 || i == 9 || i == 11)
            byte0 = 31;
        else
        if(i == 3 || i == 5 || i == 8 || i == 10)
            byte0 = 30;
        else
        if(i == 1)
            if(isLeap(j))
                byte0 = 29;
            else
                byte0 = 28;
        return byte0;
    }

    public void showCal(int i, int j, int k)
    {
        day = monthStart(i, j, k);
        days = countDays(i, j);
        for(int i1 = 1; i1 <= days;)
        {
            for(int j1 = day; j1 <= day + days;)
            {
                l[j1].setText(String.valueOf(i1));
                j1++;
                i1++;
            }

            for(int k1 = 1; k1 < day; k1++)
                l[k1].setText("");

            for(int i2 = day + days; i2 < 40; i2++)
                l[i2].setText("");

        }

    }

    public void actionPerformed(ActionEvent actionevent)
    {
        if(actionevent.getSource() == b)
            try
            {
                y = Integer.parseInt(tf.getText());
                showCal(m, y, period);
            }
            catch(NumberFormatException numberformatexception)
            {
                JOptionPane.showMessageDialog(null, "The Year Field Is Compulsory!", "Attention", 0);
            }
            catch(NullPointerException nullpointerexception) { }
    }

    JButton b;
    JButton b2;
    String str[] = {
        "SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"
    };
    JComboBox ch1;
    JComboBox ch2;
    JLabel l1;
    JLabel l2;
    JLabel l3;
    JLabel l[];
    JLabel d[];
    JPanel p1;
    JPanel p2;
    JPanel p3;
    JPanel p4;
    int year;
    int period;
    int m;
    int y;
    int days;
    int day;
    JTextField tf;
    String mon[] = {
        "January", "February", "March", "April", "May", "June", "July", "August", "September", "October",
        "November", "December"
    };
      String per[] = {
        "A.D", "B.C"
    };
}