Arrary of buttons help

Question

Hi,I'm creating a calendar/diary program and i need help with the following:
I have 3 classes. One called Calendar_Notetaker.java. This one is the main applet class. The other called MonthDate.java. This class figures out the number of days in month, leap year ect. using the java.util.date. Then another class called CalendarPanel.java. This class creates the actual caladar.
I used a button array to print the days. However i'm having problems accessing the buttons. i need to put an actionlister on them so when a user clicks on them it opens a new window. i know how to open a new window from a button but i cant figure out how to do it from a button array.
here are my classes..note these are all in sepearte files.
any suggestions would be appreciated
thanks
Kevin
package calendar_notetaker;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Calendar_NoteTaker extends Applet {
private int currentYear;
private int currentMonth;
private MonthDate myMonth;
CalendarPanel monthPanel;
private boolean isStandalone = false;
//Get a parameter value
public String getParameter(String key, String def) {
return isStandalone ? System.getProperty(key, def) :
(getParameter(key) != null ? getParameter(key) : def);
//Construct the applet
public Calendar_NoteTaker() {
//Initialize the applet
public void init() {
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
//Component initialization
private void jbInit() throws Exception {
setLayout(new BorderLayout());
myMonth = new MonthDate();
currentYear = myMonth.getYear();
currentMonth = myMonth.getMonth() + 1;
monthPanel = new CalendarPanel(myMonth);
add("Center", monthPanel);
Panel panel = new Panel();
panel.add(new Button("Previous Year"));
panel.add(new Button("Previous Month"));
panel.add(new Button("Next Month"));
panel.add(new Button("Next Year"));
add("South", panel);
show();
public void setNewMonth()
myMonth.setMonth(currentMonth - 1);
myMonth.setYear(currentYear);
monthPanel.showMonth();
public boolean action(Event event, Object obj)
if(event.target instanceof Button)
if("Previous Month".equals(obj))
if(--currentMonth < 1)//goes before january
currentYear--;
currentMonth = 12;
if(currentYear < 70)//year < 1970
currentYear = 70;
} else
if("Next Month".equals(obj))
if(++currentMonth > 12)//if you go past 12 months
currentYear++;//set to next year
currentMonth = 1;//set back to january
if(currentYear > 137)//137 years from current year.
currentYear = 137;
} else
if("Previous Year".equals(obj))
if(--currentYear < 70)
currentYear = 70;
} else
if("Next Year".equals(obj) && ++currentYear > 137)
currentYear = 137;
setNewMonth();
return true;
//Start the applet
public void start() {
//Stop the applet
public void stop() {
//Destroy the applet
public void destroy() {
//Get Applet information
public String getAppletInfo() {
return "Applet Information";
//Get parameter info
public String[][] getParameterInfo() {
return null;
package calendar_notetaker;
import java.awt.*;
import java.util.Date;
public class CalendarPanel extends Panel
private MonthDate myMonth;
Label lblMonth;//month label
Button MonthButtons[];//button arrary for month names
public CalendarPanel(MonthDate monthdate)
lblMonth = new Label("",1);//0 left 1 midele 2 right side
MonthButtons = new Button[42];//42 buttons 7x6 some wont be used
myMonth = monthdate;
setLayout(new BorderLayout());
add("North", lblMonth);
Panel panel = new Panel();
panel.setLayout(new GridLayout(7, 7));//7rows x 7cols
for(int i = 0; i < 7; i++)
panel.add(new Label(MonthDate.WEEK_LABEL));
//0 to 42 monthbuttons above is 42
for(int j = 0; j < MonthButtons.length; j++)
MonthButtons[j] = new Button(" ");
panel.add(MonthButtons[j]);//add the butttons to the panel
showMonth();
add("Center", panel);
show();
public void showMonth()
lblMonth.setText(myMonth.monthYear());//monthyear is built in util.date
int i = myMonth.getDay();//get current day
if(myMonth.weeksInMonth() < 5)//if month has less than 5 weeks
i += 7;//we still want to have a 7x7 grid
for(int j = 0; j < i; j++)
{//add the begging set of empty spaces
MonthButtons[j].setLabel(" ");
MonthButtons[j].disable();
// k<days in month user picks
for(int k = 0; k < myMonth.daysInMonth(); k++)
{//add days in month + empty spaces
MonthButtons[k+ i ].setLabel("" + (k + 1));
MonthButtons[k+ i ].enable();
for(int l = myMonth.daysInMonth() + i; l < MonthButtons.length; l++)
{//add ending number of empty spaces
MonthButtons[l].setLabel(" ");
MonthButtons[l].disable();
package calendar_notetaker;
import java.util.Date;
public class MonthDate extends Date
//week header
public static final String WEEK_LABEL[] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
//days in month assuming feburary is not a leap year
final int MonthDays[] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31,
30, 31
//label to print month names
public static final String MONTH_LABEL[] = {
"January", "February", "March", "April", "May", "June", "July", "August", "September", "October",
"November", "December"
//create constructor
public MonthDate()
this(new Date());
public MonthDate(Date date)
{//get the current system date and month add one cause its off one
this(date.getYear(), date.getMonth()+1);
public MonthDate(int year, int monthName)
super(year,monthName-1,1);//year, monthname,start day posistion
public boolean isLeapYear()
int year;
Date date = new Date();
year=date.getYear();
return ( ((year % 4 == 0) && (year % 100 != 0))
|| (year % 400 == 0) );
public int daysInMonth()
int i = getMonth();
if(i == 1 && isLeapYear())
return 29;
} else
return MonthDays[i];//return the array declared above
public int weeksInMonth()
{ //finds howmany weeks are in a month
return (daysInMonth() + getDay() + 6) / 7;
public String monthLabel()
{ //method to return the month names for printing later
return MONTH_LABEL[getMonth()];
public String monthYear()
{//method to return the month and year for printing later
return monthLabel() + " " + (1900 + getYear());

Answer 1

Ok my main problem is how to access the array of buttons. Do i need the listner in the class that i created the buttons or do i need to create an instance in the main applet. I know i have to use a loop but not sure exactly how to go about this.
thanks
Kevin
package calendar_notetaker;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Calendar_NoteTaker extends Applet {
    private int currentYear;
    private int currentMonth;
    private MonthDate myMonth;
    CalendarPanel monthPanel;
  private boolean isStandalone = false;
  //Get a parameter value
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  //Construct the applet
  public Calendar_NoteTaker() {
  //Initialize the applet
  public void init() {
    try {
      jbInit();
    catch(Exception e) {
      e.printStackTrace();
  //Component initialization
  private void jbInit() throws Exception {
    setLayout(new BorderLayout());
       myMonth = new MonthDate();
       currentYear = myMonth.getYear();
       currentMonth = myMonth.getMonth() + 1;
       monthPanel = new CalendarPanel(myMonth);
       add("Center", monthPanel);
       Panel panel = new Panel();
       panel.add(new Button("Previous Year"));
       panel.add(new Button("Previous Month"));
       panel.add(new Button("Next Month"));
       panel.add(new Button("Next Year"));
       add("South", panel);
       show();
    public void setNewMonth()
         myMonth.setMonth(currentMonth - 1);
         myMonth.setYear(currentYear);
         monthPanel.showMonth();
    public boolean action(Event event, Object obj)
       if(event.target instanceof Button)
           if("Previous Month".equals(obj))
               if(--currentMonth < 1)//goes before january
                   currentYear--;
                   currentMonth = 12;
                   if(currentYear < 70)//year < 1970
                       currentYear = 70;
           } else
           if("Next Month".equals(obj))
               if(++currentMonth > 12)//if you go past 12 months
                   currentYear++;//set to next year
                   currentMonth = 1;//set back to january
                   if(currentYear > 137)//137 years from current year.
                       currentYear = 137;
           } else
           if("Previous Year".equals(obj))
               if(--currentYear < 70)
                   currentYear = 70;
           } else
           if("Next Year".equals(obj) && ++currentYear > 137)
               currentYear = 137;
           setNewMonth();
       return true;
  //Start the applet
  public void start() {
  //Stop the applet
  public void stop() {
  //Destroy the applet
  public void destroy() {
  //Get Applet information
  public String getAppletInfo() {
    return "Applet Information";
  //Get parameter info
  public String[][] getParameterInfo() {
    return null;
package calendar_notetaker;
import java.awt.*;
import java.util.Date;
public class CalendarPanel extends Panel
    private MonthDate myMonth;
    Label lblMonth;//month label
    Button MonthButtons[];//button arrary for month names
    public CalendarPanel(MonthDate monthdate)
        lblMonth = new Label("",1);//0 left 1 midele 2 right side
        MonthButtons = new Button[42];//42 buttons 7x6 some wont be used
        myMonth = monthdate;
        setLayout(new BorderLayout());
        add("North", lblMonth);
        Panel panel = new Panel();
        panel.setLayout(new GridLayout(7, 7));//7rows x 7cols
        for(int i = 0; i < 7; i++)
            panel.add(new Label(MonthDate.WEEK_LABEL));
//0 to 42 monthbuttons above is 42
for(int j = 0; j < MonthButtons.length; j++)
MonthButtons[j] = new Button(" ");
panel.add(MonthButtons[j]);//add the butttons to the panel
showMonth();
add("Center", panel);
show();
public void showMonth()
lblMonth.setText(myMonth.monthYear());//monthyear is built in util.date
int i = myMonth.getDay();//get current day
if(myMonth.weeksInMonth() < 5)//if month has less than 5 weeks
i += 7;//we still want to have a 7x7 grid
for(int j = 0; j < i; j++)
{//add the begging set of empty spaces
MonthButtons[j].setLabel(" ");
MonthButtons[j].disable();
// k<days in month user picks
for(int k = 0; k < myMonth.daysInMonth(); k++)
{//add days in month + empty spaces
MonthButtons[k+ i ].setLabel("" + (k + 1));
MonthButtons[k+ i ].enable();
for(int l = myMonth.daysInMonth() + i; l < MonthButtons.length; l++)
{//add ending number of empty spaces
MonthButtons[l].setLabel(" ");
MonthButtons[l].disable();
package calendar_notetaker;
import java.util.Date;
public class MonthDate extends Date
//week header
    public static final String WEEK_LABEL[] = {
        "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
    //days in month assuming feburary is not a leap year
    final int MonthDays[] = {
        31, 28, 31, 30, 31, 30, 31, 31, 30, 31,
        30, 31
    //label to print month names
    public static final String MONTH_LABEL[] = {
        "January", "February", "March", "April", "May", "June", "July", "August", "September", "October",
        "November", "December"
//create constructor
    public MonthDate()
        this(new Date());
    public MonthDate(Date date)
    {//get the current system date and month add one cause its off one
        this(date.getYear(), date.getMonth()+1);
    public MonthDate(int year, int monthName)
        super(year,monthName-1,1);//year, monthname,start day posistion
    public boolean isLeapYear()
        int year;
        Date date = new Date();
        year=date.getYear();
        return ( ((year % 4 == 0) && (year % 100 != 0))
             || (year % 400 == 0) );
    public int daysInMonth()
        int i = getMonth();
        if(i == 1 && isLeapYear())
            return 29;
        } else
            return MonthDays;//return the array declared above
public int weeksInMonth()
{ //finds howmany weeks are in a month
return (daysInMonth() + getDay() + 6) / 7;
public String monthLabel()
{ //method to return the month names for printing later
return MONTH_LABEL[getMonth()];
public String monthYear()
{//method to return the month and year for printing later
return monthLabel() + " " + (1900 + getYear());