JAVA : Calendar

Creating a Graphical Calendar in Java:-

Graphical Calender

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Graphical Calendar is a purely JAVA based application.This Java application provides you a fully function Graphical Calendar. Java does not provide a inbuilt Graphical calendar but it has a Calendar class in java.utill package.Java's Calendar class provide you a set of methods for getting date, time and other date-time arithmetics.

import java.util.Calendar; public class Cal{   public static void main(String[] args){      Calendar calendar = Calendar.getInstance ();   } }

GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar used by most of the world. A Calendar object can be initialized by GregorianCalendar class.

import java.util.Calendar; public class Cal{   public static void main(String[] args){      Calendar now = GregorianCalendar.getInstance();   } }

This Graphical Calendar allows you to choose a year, a month and a day. On loading application uses the current date as of your system. This Graphical Calendar can also be used as a date picker in any of Java application if needed. For example in a Railway reservation system this Calendar can be used as a date picker.

Download Files Here:

• Download Source Code of Graphical Calendar JAVA Application (File Size: 25Kb)

Coding for making Grahical Calendar :-


Celendar.java:- In Celendar.java the coding for setting the look and feel and adding the Days panel in the frame is done.

import java.awt.*; import javax.swing.*; import javax.swing.UIManager.*; public class Celendar extends JFrame{ private JPanel p; Celendar(){ super("Calendar"); try {    for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {         if ("Nimbus".equals(info.getName())) {            UIManager.setLookAndFeel(info.getClassName());                    break;        }        else{                                                UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");        }    } } catch (Exception e) { } setLayout(new GridLayout(1,1)); setSize(322,223); setResizable(false); Days d= new Days(); add(d); } public static void main(String aggsp[]){ Celendar c = new Celendar(); c.setVisible(true); c.setDefaultCloseOperation(EXIT_ON_CLOSE); } }

Days.java:- In this Days.java file all the coding of basic calendar is done.

import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.plaf.*; import javax.swing.UIManager; import java.util.*; public class Days extends JPanel { //lables use for showing weekday names private JLabel sun; private JLabel mon; private JLabel tue; private JLabel wed; private JLabel thu; private JLabel fri; private JLabel sat;         //need to images blackArrowUp.gif and upArrowUp.gif  to put on up and down button  private Icon pic[]= {new ImageIcon(getClass().getResource("blackArrowUp.gif")),new ImageIcon(getClass().getResource("blackArrowDown.gif"))}; private JPanel mainpanel;   //for add days and weekday private JPanel p[]= new JPanel[42]; //Array of Panels for Adding Days Buttons private JButton b[]= new JButton[31]; //Array of 31 Buttons For 31 Days //for year , month and date (all will be added to Pannel ) private JPanel mainp; //main Panel on which date , year and month will add private JTextField date; //for showing date in text fields public JComboBox month; //for months public JTextField year; //for year private JButton sb[]= new JButton[2]; // for increasing year by 1 on every click //string array has name of months for adding to combobox private String strmon[]= {"January","Febuary","March","April","May","June","July","Augest","September","October","November","December"}; //Constructor Start Days(){ setLayout(null); //setting layout setSize(350,228); setVisible(true); //first Frame Build mainp = new JPanel(); mainp.setLayout(null); mainp.setSize(325,31); mainp.setLocation(1,0); date = new JTextField(); //date textField will strore the date date.setSize(100,30); date.setLocation(5,0); date.setBackground(Color.WHITE); date.setFont(new Font("Arial",Font.PLAIN,14)); date.setEditable(false); month = new JComboBox(strmon); //month combo box will have all months month.setSize(90,30); month.setLocation(110,0); year = new JTextField("2008"); //year will have year part of date year.setSize(70,30); year.setLocation(205,0); year.setBackground(Color.WHITE); year.setEditable(false); sb[0] = new JButton(""); //sb scroll bar increments the year by 1 sb[0].setSize(30,15); sb[0].setLocation(275,0); sb[0].setIcon(pic[0]); sb[1] = new JButton(""); //sb scroll bar increments the year by 1 sb[1].setSize(30,15); sb[1].setLocation(275,16); sb[1].setIcon(pic[1]); mainp.add(date); mainp.add(month); mainp.add(year); mainp.add(sb[0]); mainp.add(sb[1]); add(mainp); //Days Panel mainpanel = new JPanel(); mainpanel.setLayout(new GridLayout(7,7,1,1)); mainpanel.setSize(315,160); mainpanel.setLocation(1,31); sun = new JLabel("Sun"); sun.setForeground(Color.RED); mon = new JLabel("Mon"); tue = new JLabel("Tue"); wed = new JLabel("Wed"); thu = new JLabel("Thu"); fri = new JLabel("Fri"); sat = new JLabel("Sat"); //add labels to panel mainpanel.add(sun); mainpanel.add(mon); mainpanel.add(tue); mainpanel.add(wed); mainpanel.add(thu); mainpanel.add(fri); mainpanel.add(sat); //Initializing memory to Jpanels and add it to mainpanel for (int x=0;x<42;x++){ p[x]= new JPanel(); p[x].setLayout(new GridLayout(1,1)); p[x].setBackground(Color.WHITE); mainpanel.add(p[x]); validate(); } final HandlerClass handler= new HandlerClass(); // object of handlerclass for (int i=0;i<31;i++){ //only Initializing memory to buttons not adding them b[i]= new JButton(); b[i].addActionListener(handler); b[i].setFont(new Font("Times New Roman",Font.PLAIN,11)); b[i].setText(Integer.toString(i+1)); } final Calendar now = GregorianCalendar.getInstance(); //create a Calendar object year.setText(Integer.toString(now.get(Calendar.YEAR))); //get year and month from Calendar object month.setSelectedIndex(now.get(Calendar.MONTH)); //add values to year and month validate(); // DAY_OF_WEEK GIVES THE DAY OF THE FROM WIHCH THE MONTH STARTS int ye=Integer.parseInt(year.getText()); Calendar cal = new GregorianCalendar(ye, month.getSelectedIndex(), 1); int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK); for (int i=0;i             //loop running according to the number of days   p[dayOfWeek-1].add(b[i]);               //adding the days button on pannels according to the dayof week dayOfWeek++; } int bd=now.get(Calendar.DATE); //getting the current date b[bd-1].setEnabled(false); // sets the current date button enabled false add(mainpanel); // add main pannel to validate(); month.addItemListener( new ItemListener(){ public void itemStateChanged(ItemEvent event){ if (event.getStateChange()==ItemEvent.SELECTED){ mainpanel.removeAll(); validate(); mainpanel.add(sun); mainpanel.add(mon); mainpanel.add(tue); mainpanel.add(wed); mainpanel.add(thu); mainpanel.add(fri); mainpanel.add(sat); for (int x=0;x<42;x++){ p[x].removeAll(); mainpanel.add(p[x]); validate(); } int ye=Integer.parseInt(year.getText()); Calendar cal = new GregorianCalendar(ye, month.getSelectedIndex(), 1); int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK); for (int i=0;i p[dayOfWeek-1].add(b[i]); dayOfWeek++; validate(); } validate(); } mainp.validate(); validate(); date.setText(Integer.toString(handler.db +1).concat(" / ").concat(Integer.toString(month.getSelectedIndex() + 1)).concat(" / ").concat(year.getText())); } } ); sb[0].addActionListener( new ActionListener(){ public void actionPerformed(ActionEvent e){ int y = Integer.parseInt(year.getText()); y++; year.setText(Integer.toString(y)); mainpanel.removeAll(); validate(); mainpanel.add(sun); mainpanel.add(mon); mainpanel.add(tue); mainpanel.add(wed); mainpanel.add(thu); mainpanel.add(fri); mainpanel.add(sat); for (int x=0;x<42;x++){ p[x].removeAll(); mainpanel.add(p[x]); validate(); } int ye=Integer.parseInt(year.getText()); Calendar cal = new GregorianCalendar(ye, month.getSelectedIndex(), 1); int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK); for (int i=0;i p[dayOfWeek-1].add(b[i]); dayOfWeek++; validate(); } validate(); //sets the date on Click of year Button date.setText(Integer.toString(handler.db +1).concat(" / ").concat(Integer.toString(month.getSelectedIndex() + 1)).concat(" / ").concat(year.getText())); } } ); sb[1].addActionListener( new ActionListener(){ public void actionPerformed(ActionEvent e){ int y = Integer.parseInt(year.getText()); y--; year.setText(Integer.toString(y)); mainpanel.removeAll(); validate(); mainpanel.add(sun); mainpanel.add(mon); mainpanel.add(tue); mainpanel.add(wed); mainpanel.add(thu); mainpanel.add(fri); mainpanel.add(sat); for (int x=0;x<42;x++){ p[x].removeAll(); mainpanel.add(p[x]); validate(); } int ye=Integer.parseInt(year.getText()); Calendar cal = new GregorianCalendar(ye, month.getSelectedIndex(), 1); int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK); for (int i=0;i p[dayOfWeek-1].add(b[i]); dayOfWeek++; validate(); } validate(); //sets the date on Click of year Button date.setText(Integer.toString(handler.db +1).concat(" / ").concat(Integer.toString(month.getSelectedIndex() + 1)).concat(" / ").concat(year.getText())); } } ); //sets the date on form load date.setText(Integer.toString(handler.db +1).concat(" / ").concat(Integer.toString(month.getSelectedIndex() + 1)).concat(" / ").concat(year.getText())); } //returns no. of days in a week public int getDaysNo(){ int no = 31; if (month.getSelectedIndex()==1){ no=28; if (Integer.parseInt(year.getText())%4==0){ no=29; } month.validate(); } if (month.getSelectedIndex()==3 || month.getSelectedIndex()==5 || month.getSelectedIndex()==8 || month.getSelectedIndex()==10) { no=30; } return no; } // handler class set which date is selected class HandlerClass implements ActionListener{ Calendar now = Calendar.getInstance(); public int db=(now.get(Calendar.DATE))-1; public void actionPerformed(ActionEvent e){ for (int k=0;k<31;k++){ if (e.getSource()==b[k]) { b[k].setEnabled(false); validate(); db=k; } else{ b[k].setEnabled(true); validate(); } month.validate(); } date.setText(Integer.toString(db +1).concat(" / ").concat(Integer.toString(month.getSelectedIndex()+1)).concat(" / ").concat(year.getText())); } } }