Question

How to create weekly calendar GUI in Java Language?
I want to implement a calendar display current week, and can go back and forth to see the past week and next week. Anyhelp with detail is appreciated. Thank you!
For example for this current week: S    M T W T F S
                                                             28 29 30 31 1 2 3
Above is my expected output.

Answer 1

CODE

import javax.swing.*;

import javax.swing.table.*;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

public class Main{

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;

  

public static void main (String args[]){

//Look and feel

try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}

catch (ClassNotFoundException e) {}

catch (InstantiationException e) {}

catch (IllegalAccessException e) {}

catch (UnsupportedLookAndFeelException e) {}

  

//Prepare 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 previous());

btnNext.addActionListener(new next());

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

refresh (realMonth, realYear); //Refresh calendar

}

  

public static void refresh(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 CalendarGUI());

}

  

static class CalendarGUI 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 previous implements ActionListener{

public void actionPerformed (ActionEvent e){

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

currentMonth = 11;

currentYear -= 1;

}

else{ //Back one month

currentMonth -= 1;

}

refresh(currentMonth, currentYear);

}

}

static class next implements ActionListener{

public void actionPerformed (ActionEvent e){

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

currentMonth = 0;

currentYear += 1;

}

else{ //Foward one month

currentMonth += 1;

}

refresh(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);

refresh(currentMonth, currentYear);

}

}

}

}