MonthPanel.java Source code

Introduction

Here is the source code for MonthPanel.java

Source

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.SystemColor;
import java.util.Calendar;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

class MonthPanel extends JPanel {
    int month;
    int year;
    protected String[] monthNames = { "January", "February", "March", "April", "May", "June", "July", "August",
            "September", "October", "November", "December" };

    protected String[] dayNames = { "S", "M", "T", "W", "T", "F", "S" };

    public MonthPanel(int month, int year) {
        this.month = month;
        this.year = year;
        JPanel monthPanel = new JPanel(true);
        monthPanel.setLayout(new BorderLayout());
        monthPanel.add(createTitleGUI(), BorderLayout.NORTH);
        monthPanel.add(createDaysGUI(), BorderLayout.SOUTH);
        this.add(monthPanel);
    }

    protected JPanel createTitleGUI() {
        JPanel titlePanel = new JPanel(true);
        titlePanel.setLayout(new FlowLayout());
        titlePanel.setBackground(Color.WHITE);

        JLabel label = new JLabel(monthNames[month] + " " + year);
        label.setForeground(SystemColor.activeCaption);
        titlePanel.add(label, BorderLayout.CENTER);
        return titlePanel;
    }

    protected JPanel createDaysGUI() {
        JPanel dayPanel = new JPanel(true);
        dayPanel.setLayout(new GridLayout(0, dayNames.length));

        Calendar today = Calendar.getInstance();
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.MONTH, month);
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.DAY_OF_MONTH, 1);

        Calendar iterator = (Calendar) calendar.clone();
        iterator.add(Calendar.DAY_OF_MONTH, -(iterator.get(Calendar.DAY_OF_WEEK) - 1));

        Calendar maximum = (Calendar) calendar.clone();
        maximum.add(Calendar.MONTH, +1);

        for (int i = 0; i < dayNames.length; i++) {
            JPanel dPanel = new JPanel(true);
            dPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            JLabel dLabel = new JLabel(dayNames[i]);
            dPanel.add(dLabel);
            dayPanel.add(dPanel);
        }

        int count = 0;
        int limit = dayNames.length * 6;

        while (iterator.getTimeInMillis() < maximum.getTimeInMillis()) {
            int lMonth = iterator.get(Calendar.MONTH);
            int lYear = iterator.get(Calendar.YEAR);

            JPanel dPanel = new JPanel(true);
            dPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            JLabel dayLabel = new JLabel();

            if ((lMonth == month) && (lYear == year)) {
                int lDay = iterator.get(Calendar.DAY_OF_MONTH);
                dayLabel.setText(Integer.toString(lDay));
            }
            dPanel.add(dayLabel);
            dayPanel.add(dPanel);
            iterator.add(Calendar.DAY_OF_YEAR, +1);
            count++;
        }

        for (int i = count; i < limit; i++) {
            JPanel dPanel = new JPanel(true);
            dPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));

            dPanel.add(new JLabel());
            dayPanel.add(dPanel);
        }
        return dayPanel;
    }
}

public class Main {
    public static void main(String[] args) {
        MonthPanel panel = new MonthPanel(5, 2015);
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new FlowLayout());
        frame.add(panel);
        frame.pack();
        frame.setVisible(true);
    }
}