Two main problems with this. One the very last code block all the way at the bottom of this is giving me the NullPointerException. I want it to add an * every time it detects an event happening on that specific date.
Secondly, I can’t seem to get the calendar to go back a month and start on the proper date… It’s become very annoying.
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Calendar extends Applet implements ActionListener{
/**
*
*/
private static final long serialVersionUID = 1L;
private Button next, last;
private Label month,showYear,sun,mon,tue,wed,thu,fri,sat;
private Label[] allDays= new Label[37];
private Label[] eventMarker = new Label[37];
private String[] months= {"January","February","March","April","May","June",
"July","August","September","October","November","December"};
private String[] monthDays = {"31","29","31","30","31","30","31","31","30","31","30","31"};
private int current,year,dateHold,stringParse;
private final int MAX = 1000;//number of events
//arrays for data input from file
private int overallIndex = 0;
private String[] usrMonth= new String[MAX];
private String[] usrDay = new String[MAX];
private int[] usrYear = new int[MAX];
//private int[] usrTime = new int[MAX];
private String[] usrInfo = new String[MAX];
private TextField[] fields = new TextField[5];
private Label[] overFields = new Label[5];
private Button addApt ;
public void init(){
setSize(1050,750);
year = 2012;
current = 0;//month in array
next = new Button("Next");
last = new Button("Last");
month = new Label(months[current]);
showYear = new Label("Year 2012");
//day names on calendar
sun = new Label("Sunday");
mon = new Label("Monday");
tue = new Label("Tuesday");
wed = new Label("Wednesday");
thu = new Label("Thursday");
fri = new Label("Friday");
sat = new Label("Saturday");
//day numbers on calendar originally for January 2012
String num;
for(int i = 0; i < 37; i++){
if(i > 30)
allDays[i]=new Label(" ");
else{
num = "" + (i+1);
allDays[i]=new Label(num);}
}
for(int i = 0; i < 37; i++){
eventMarker[i] = new Label("|:");
}
addApt = new Button("Add Appointment");
overFields[0] = new Label("Enter month by number.");
overFields[1] = new Label("Enter the number date.");
overFields[2] = new Label("Enter the year.");
overFields[3] = new Label("Enter any information on appointment.");
overFields[4] = new Label("Search appointments for key words here.");
for (int i = 0; i < 5; i ++){
fields[i] = new TextField("Dont forget to press Enter.",300);
}
//GUI add's
//buttons
add(next);
add(last);
add(addApt);
//labels
add(month);
add(showYear);
add(sun);
add(mon);
add(tue);
add(wed);
add(thu);
add(fri);
add(sat);
//text fields and actionListener
for(int i = 0; i < 5; i++){
add(overFields[i]);
add(fields[i]);
fields[i].addActionListener(this);
}
for(int i = 0; i <37; i++)//Add array
add(allDays[i]);
//button listeners
next.addActionListener(this);
last.addActionListener(this);
}//end of init
public void paint(Graphics g){
int first = 571;
for (int i = 0; i < 6; i++){//Vertical lines
g.drawLine(first, 75, first, 600);
first += 71;
}
//day name positions
sun.setBounds(510,75,40,10);
mon.setBounds(580,75,40,10);
tue.setBounds(650,75,40,10);
wed.setBounds(710,75,40,10);
thu.setBounds(790,75,40,10);
fri.setBounds(860,75,40,10);
sat.setBounds(930,75,40,10);
//day number positions
int second;
first = 100;//horizontal line start and finish position
for (int i = 0; i < 7; i++){//horizontal lines
if (i == 0)//indented on first line
g.drawLine(525, first, 975, first);
else
g.drawLine(500, first, 1000, first);
first += 100;
}
for(int i = 0; i < 37; i++){//adding labels event marker
add(eventMarker[i]);
}
first = 510;//position for event marker
second = 125;//diddo
for(int i = 0; i < 37; i++){//set position event marker
for(int j = 0; j < 7; j++){//inner loop for a per week
if((i+j) >= 37)//if index finishes, but loop still has days in week that would call out of bounds
continue;
eventMarker[i+j].setBounds(first,second,10,10);//added index's for specific day of week
first+=71;
}
i+= 6;
first = 510;
second += 100;
}
last.setBounds(505,31,88,30);
next.setBounds(895,31,88,30);
month.setBounds(730,31,100,30);
showYear.setBounds(800,31,100,30);
addApt.addActionListener(this);
//frame
g.drawRect(0, 0, 500, 700);
g.drawRect(500, 0, 500, 700);
//text fields and labels bounds
first = 120;
second = 150;
for(int i = 0; i < 5; i++){
overFields[i].setBounds(first,second,100,20);
second += 30;
fields[i].setBounds(first, second, 300, 20);
second += 50;
}
addApt.setBounds(300,600,100,30);
repaint();
}//end of paint
public void repaint(){
int first = 550;//date number position
int second = 105;
for(int i = 0; i < 37; i++){//Setting date number position
for(int j = 0; j < 7; j++){//inner loop for a per week
if((i+j) >= 37)//if index finishes, but loop still has days in week that would call out of bounds
continue;
allDays[i+j].setBounds(first,second,10,10);//added index's for specific day of week
first+=71;
}
i+=6;
//setting bounds
second+=100;
first=550;
}
}
public void actionPerformed(ActionEvent evt){
if (evt.getSource()==next){
current++;
if(current == 12){//resets to January
current = 0;
year++;
String now="Year " + year;
showYear.setText(now);
}
month.setText(months[current]);
for (int i = 0; i < 37; i++){//setting proper day numbers
if(allDays[i].getText().equals(monthDays[current==0 ? 11:current-1]))//so you don't access index -1
dateHold=i +1;//for zero index of i
dateHold%=7;//date left off at
}
//dateHold++;
for(int j = 0; j < 37; j++)//erase dates
allDays[j].setText("");
for(int i = 0; i < 37; i++){//sets dates
stringParse = Integer.parseInt(monthDays[current]);
if(current==1 && (i+2) == stringParse && year%4!=0){//on the 28 of non leap years feb, print then break loop
allDays[dateHold].setText("" + (i+1));
break;
}
if((i+1) > stringParse)//without going over max per month
continue;
allDays[dateHold].setText("" + (i+1));
dateHold++;
}
for(int i = 0; i < 37; i++){
eventMarker[i].setText("|;");
}
}//end next evt
if (evt.getSource()==last){//NOT CURRENTLY WORKING...
current--;
if(current == -1){//resets to February
current = 11;
year--;
String now = "Year " +year;
showYear.setText(now);
}
month.setText(months[current]);
stringParse = Integer.parseInt(monthDays[current]);
for (int i = 0; i < 7; i++){//check first week
if(allDays[i].getText().equals("1")){
dateHold =i;//plus then minus to fix index and next month
}
}
for(int j = 0; j < 37; j++)//erase dates
allDays[j].setText("");
int something;//local number holder
int countDown = stringParse;//local count down for reverse printing
if(current ==1 && year%4!=0)//February fix
countDown = 28;
something = countDown - 1 + (dateHold);
for (int i = 36; i >0; i--){//reverse date printing
if(((36 -i)-dateHold)>stringParse)//if date over max
continue;
if(something < 0)
continue;
try{//kept reaching out of index here
allDays[something].setText("" + (countDown));
//System.out.println("i:" + i + "\ndateHold:" + dateHold + "\ncountDown:" + countDown);
}
catch(ArrayIndexOutOfBoundsException e){
System.out.println("error i:" + i + "\ndateHold:" + dateHold + "\ncountDown:" + countDown);
}
countDown--;
something--;
if(countDown <= 0)
break;
}
for(int i = 0; i < 37; i++){
eventMarker[i].setText("|;");
}
}//end last evt
String theDate;
int numDate;
if(evt.getSource() == fields[0]){
theDate = fields[0].getText();
try{
numDate = Integer.parseInt(theDate);
usrMonth[overallIndex] = months[(numDate-1)];
}catch(NumberFormatException e){
System.out.println("Error field[0]");
}
catch(ArrayIndexOutOfBoundsException e){}
}//end of fields[0]
if(evt.getSource() == fields[1]){
theDate = fields[1].getText();
try{
numDate = Integer.parseInt(theDate);
usrDay[overallIndex] = theDate;
}catch(NumberFormatException e){System.out.println("Error field[1]");}
catch(ArrayIndexOutOfBoundsException e){}
}//end of fields[1]
if(evt.getSource() == fields[2]){
theDate = fields[2].getText();
try{
numDate = Integer.parseInt(theDate);
usrYear[overallIndex] = numDate;
}catch(NumberFormatException e){System.out.println("Error field[2]");}
catch(ArrayIndexOutOfBoundsException e){}
}//end of fields[2]
if(evt.getSource() == fields[3]){
theDate = fields[3].getText();
usrInfo[overallIndex] = theDate;
}
if(evt.getSource() == addApt){
if(usrDay[overallIndex] != null && usrMonth[overallIndex] != null){
theDate = fields[1].getText();
try{
numDate = Integer.parseInt(theDate);
usrDay[overallIndex] = theDate;
}catch(NumberFormatException e){System.out.println("Error field[1]");}
catch(ArrayIndexOutOfBoundsException e){}
theDate = fields[2].getText();
try{
numDate = Integer.parseInt(theDate);
usrYear[overallIndex] = numDate;
}catch(NumberFormatException e){System.out.println("Error field[2]");}
catch(ArrayIndexOutOfBoundsException e){}
theDate = fields[3].getText();
usrInfo[overallIndex] = theDate;
System.out.println("Appointment Added\n" + (String) usrDay[overallIndex] + "\n" + usrMonth[overallIndex] + "\n" + usrInfo[overallIndex] + "\n" +usrYear[overallIndex]);
checkEvent();
repaint();
overallIndex++;//ONLY PLACE THIS CAN HAPPEN
for (int i = 0; i < 5; i++)
fields[i].setText("Dont forget to press Enter.");
}
}
}//end of action performed
public void checkEvent(){
try{for(int i = 0; i < MAX; i++){//checking for events
if(usrMonth[i].equals(months[current]) &&
usrYear[i] == year){
for(int j = 0; j < 37; j++){
if(allDays[j].getText().equals(usrDay[i])){
String hold = eventMarker[j].getText();
hold += "*";
eventMarker[j].setText(hold);
}
}
}
}}
catch(NullPointerException e){System.out.println("Null really");}
}
}
Possible null values:
In which line do you get the exception exactly?