Potrzebuję dokonać konwersji trzech intów:
dayApp, monthApp oraz yearApp
na 1 stringa.
jesli źle sprecyzowałem to pokazuję na schemacie o co mi chodzi:
int dayApp + int monthApp + int yearApp = String date
Liczę na jak najszybsze odpowiedzi.
dziękuję, z góry
Bardzo źle sprecyzowałeś: dayApp=2, monthApp=11, yearApp=2467 , co ma wyjść ?
jesli to działa do łączenia kilku int w jeden private int date = dayApp+monthApp+yearApp; to wystarczy nawet gdy poda ktoś komende na konwersje int date na string date.
Pozdrawiam.
wystarczy że będzie to wyglądało jako:
dayApp = 06
montApp = 12
yearApp = 2007
to date może wyglądać: 06122007, i tak mam osobną metodę do wyświetlania tej daty w przejżysty sposób, a jako taki int można robić update automatyczny czyli porownywania oraz sprawdzanie które App już były a ktore nie. Niestety jako int nie mogę tego porównywać metodą equals czy sortować comperTo
Integer.toString(dayApp)+Integer.toString(montApp )+Integer.toString(yearApp )
:-)
(dayApp<10?"0":"")+dayApp+(monthApp<10?"0":"")+yearApp
Kawałek zjadłem
(dayApp<10?"0":"")+dayApp+(monthApp<10?"0":"")+monthApp+yearApp
Do Kazia - twój sposób chyba jest niedobry:
2 11 2007 oraz 21 1 2007 utworzą ten sam ciąg.
Program się ładnie kompiluje, ale zawsze remove czy find method pokazuje mi, nie działa, tzn pokazuje że nie ma takich appointments.
Jeśli ktośby był tak dobroduszny i pomugł mi z tym oto kodem:
KLASA APPOINTMENT:
import java.util.*;
/**
* @author Adam Omelak - [email protected]
* @version 22-11-2007
*/
public class Appointment
implements Comparable<Appointment>
{
private String subject;
//private String date;
private int dayApp;
private int monthApp;
private int yearApp;
private int timeStart;
private int timeEnd;
private String person;
private String date = Integer.toString(dayApp)+Integer.toString(monthApp )+Integer.toString(yearApp );
public Appointment()
{
subject = "unknown";
dayApp = 00;
monthApp = 00;
yearApp = 0000;
timeStart = 0000;
timeEnd = 0000;
person = "unknown";
}
public Appointment(String s, int dA, int mA, int yA, int t, int t2, String p) {
subject = s;
dayApp = dA;
monthApp = mA;
yearApp = yA;
timeStart = t;
timeEnd = t2;
person = p;
}
public void readKeyboard() {
Scanner in = new Scanner(System.in);
System.out.print("Enter the subject for appoinment: ");
subject=in.next();
System.out.print("Enter person with who you have got appointment: ");
person=in.next();
System.out.print("Enter the day of appointment (dd): ");
dayApp=in.nextInt();
System.out.print("Enter the month of appointment (mm): ");
monthApp=in.nextInt();
System.out.print("Enter the year of appointment (yyyy): ");
yearApp=in.nextInt();
System.out.print("Enter starting time (for example: 1254): ");
timeStart=in.nextInt();
System.out.print("Enter ending time (for example: 1354): ");
timeEnd=in.nextInt();
System.out.println("***********************");
System.out.println("I'm writing into a file");
System.out.println("***********************");
this.printOut();
}
public void date()
{
System.out.println("Date: "+dayApp+"/"+monthApp+"/"+yearApp);
}
public void dateInt()
{
System.out.println(""+date);
}
public void printOut() {
System.out.println("Subject of Appointment: " + subject);
System.out.println("Appointment with: " + person);
date();
System.out.println("Start time: " + timeStart);
System.out.println("Ends time: " + timeEnd);
}
public void setSubject(String s) {
subject = s;
}
public String getSubject()
{
return subject;
}
public void setDate(String d) {
date = d;
}
public void setTime(int t) {
timeStart = t;
}
public void setTime2(int t2) {
timeEnd = t2;
}
public void setPerson(String p) {
person = p;
}
public boolean equals(Appointment other)
{
if((this.date).equals (other.date))
return true;
else
return false;
}
public int compareTo(Appointment other) {
return (this.date).compareTo(other.date);
}
public void print2()
{
System.out.println("- DATE "+dayApp+"/"+monthApp+"/"+yearApp+", Start: "+timeStart+", End: "+timeEnd+", Subject: "+subject+", With: "+person);
}
public String toString() {
return ""+dayApp+" "+monthApp+" "+yearApp+" "+timeStart+" "+timeEnd+" "+subject+" "+person;
}
}
KLASA DIARY:
import java.util.*;
import java.io.*;
/**
* @author Adam Omelak - [email protected]
* @version 22-11-2007
*/
public class Diary
{
private List <Appointment> appointments;
Scanner in = new Scanner(System.in);
private int nextFreeLocation;
private Appointment appointment;
public Diary()
{
appointments = new ArrayList<Appointment>();
}
public void addAppointment(Appointment theAppointment)
{
appointments.add(theAppointment);
nextFreeLocation = nextFreeLocation + 1;
}
public void printOut() {
String results = " \n";
for (Appointment a:appointments)
{
a.print2();
}
}
public void remove2()
{
Appointment appToRem=new Appointment();
boolean flag=false;
System.out.print("On which day do you want remove appointments? ");
Scanner in=new Scanner(System.in);
String d=in.next();
appToRem.setDate(d);
for (int i=0;i<appointments.size();i++){
if (appointments.get(i).equals(appToRem)){
appointments.remove(i); i--;
flag=true;
System.out.println("Appointments removed");
}
}
if(flag==false)
System.out.println("There is no appointments on this day");
}
public void removeAppointment(Appointment oneToFind) {
int index = 0;
while ((!(appointments.get(index)).equals(oneToFind)) &&
(index < nextFreeLocation))
{
index++;
}
if ((appointments.get(index)).equals(oneToFind))
{
appointments.remove(index);
}
else
{
System.out.println("Unable to find appointments for this day");
}
}
public void findDate() {
Appointment oneToFind = new Appointment();
System.out.println("On which date do you looking for appointments? ");
String d = in.next();
oneToFind.setDate(d);
for (Appointment a:appointments)
{
if (a.equals(oneToFind))
{
a.print2();
}
}
}
public Appointment find(Appointment who) {
for (Appointment a:appointments) {
if (a.equals(who))
return a;
}
return null;
}
public String toString() {
String results = " \n";
for (Appointment a:appointments)
{
results = results + a.toString() + "\n";
}
return results;
}
public int size()
{
return appointments.size();
}
public void sort()
{
Collections.sort(appointments);
}
}
KLASA DIARY APP
import java.util.*;
import java.io.*;
/**
* @author Adam Omelak - [email protected]
* @version 22-11-2007
*/
public class DiaryApp
{
//private ArrayList <Appointment> appointments;
private Diary diary;
private Scanner scan;
Scanner in = new Scanner(System.in);
private Appointment appointment;
private String today;
private int day2;
private int month2;
private int year2;
public void today() {
System.out.println("Diary updated for date: "+day2+"/"+month2+"/"+year2);
}
public DiaryApp()
{
System.out.println("**Program is running**");
scan = new Scanner(System.in);
diary = new Diary();
System.out.println("Enter todays day: (dd)");
day2 = in.nextInt();
System.out.println("Enter todays month: (mm)");
month2 = in.nextInt();
System.out.println("Enter todays year: (yyyy)");
year2 = in.nextInt();
}
public void load() throws IOException
{
Scanner in =new Scanner(System.in);
today();
System.out.println("loading from the file");
System.out.println("Using file: app.txt \n");
Scanner infile = new Scanner(new InputStreamReader (new FileInputStream("app.txt")));
int num = infile.nextInt();
for (int i=0;i<num;i++)
{
int dA = infile.nextInt();
int mA = infile.nextInt();
int yA = infile.nextInt();
int t = infile.nextInt();
int t2 = infile.nextInt();
String s = infile.next();
String p = infile.next();
Appointment a = new Appointment(s, dA, mA, yA, t, t2, p);
diary.addAppointment(a);
}
infile.close();
diary.sort();
}
public void save() throws IOException
{
PrintWriter outfile = new PrintWriter(new OutputStreamWriter(new FileOutputStream("app.txt")));
outfile.println(diary.size());
outfile.println(diary.toString());
outfile.close();
}
//public void update()
//{
// if(today < appointment.d)
// {
// appointments.remove(d);
// }
// else
// return null;
//}
public void runMenu() throws IOException
{
char ch;
do{
System.out.println("Type any letter below and press enter to confirm:");
System.out.println("Type 'A' to add new appointment");
System.out.println("Type 'R' to remove appointment");
System.out.println("Type 'F' to search appointment");
System.out.println("Type 'P' to print out list of appointments");
System.out.println("Type 'S' to save to a file");
System.out.println("Type 'Q' to quit the program");
System.out.println("Type here ");
Scanner in=new Scanner(System.in);
String choice=in.next();
ch=choice.charAt(0);
switch(ch) {
case 'A': case 'a':
System.out.println("************");
System.out.println("Type new appointment");
System.out.println("************");
Appointment a = new Appointment();
a.readKeyboard();
diary.addAppointment(a);
diary.sort();
System.out.println("*****************");
System.out.println("Appointment was added");
System.out.println("*****************");
break;
case 'F': case 'f':
diary.findDate();
diary.sort();
System.out.println("\n");
break;
case 't':
appointment.dateInt();
break;
case 'P': case 'p':
System.out.println("*************");
System.out.println("List of appointments:");
System.out.println("*************");
diary.sort();
diary.printOut();
System.out.println("\n");
break;
case 'R': case 'r':
diary.remove2();
diary.sort();
break;
case 'S': case 's':
save();
System.out.println("File was successful saved \n");
break;
case 'Q': case 'q':
System.out.println("******************");
System.out.println("Files updated!");
System.out.println("******************");
System.out.println("Program was closed");
System.out.println("******************");
System.out.println("Thank you");
System.out.println("*********");
diary.sort();
break;
default:
System.out.println("***********************************");
System.out.println("Error!, Type again accepted letter!");
System.out.println("***********************************");
}
}while ((ch!='Q')&(ch!='q'));
}
public void find() {
Appointment oneToFind = new Appointment();
System.out.println("On which date do you looking for appointments? ");
String d = in.next();
oneToFind.setDate(d);
Appointment found = diary.find(oneToFind);
if (found==null)
System.out.println("There is no appointments on this day");
else
System.out.println("Appointments for that day: \n");
found.print2();
System.out.println("\n");
}
public static void main(String args[]) throws IOException
{
DiaryApp demo = new DiaryApp();
demo.load();
demo.runMenu();
demo.save();
}
}
Za każda odpowiedź serdecznie dziękuję.
Chodzi o to że warunek equals nigdy nie jest spełniony a kiedy chce wywołać funkcję:
public void dateInt()
{
System.out.println(""+date);
}
w klasie appointment wtedy wyskakuje błąd że null pointer exception, czyli że string jest pusty