ok now i'm confused, where did and why do we have objects: firstStudent and secondStudent?
student.09
5
Junior Poster
moutanna
2
Posting Whiz
Those are only parameters of the function
moutanna
2
Posting Whiz
you can rename them by
(Profile p, Profile oldestStu) instead of first and second student
student.09
5
Junior Poster
um is there no alternative for that? because that coding seems a little more advance.
Here's what i have so far as far as the coding goes, but again not sure if its logically correct but errors wise it's just giving 5 (not sure how to fix that). But take a look is that any better or did I just make it worse?
import java.util.Scanner;
public class Profile
{
private String studentId;
private String birthDateFormattedMon;
private int birthDateMonth;
private int birthDateDay;
private int birthDateYear;
private static int totalStudents;
private static int birthDateTotal;
Profile()
{}
Profile (int bdayDay, int bdayMonth, int bdayYear, String studId)
{
birthDateDay = bdayDay;
birthDateMonth = bdayMonth;
birthDateYear = bdayYear;
studentId = studId;
}
public Profile(int year, int month, int day)
{
birthDateYear=year;
birthDateMonth=month;
birthDateDay=day;
}
public Profile(int month, int day)
{
birthDateMonth=month;
birthDateDay=day;
}
public int getBirthDateDay()
{
return birthDateDay;
}
public int getBirthDateMonth()
{
return birthDateMonth;
}
public int getBirthDateYear()
{
return birthDateYear;
}
public String getStudentId()
{
return studentId;
}
public static void main (String[] args)
{
Profile p = new Profile();
Profile oldestStudent = new Profile(1999,12, 31);
Profile base = new Profile (02, 29);
p.readData();
while (!(p.studentId.equals("000")))
{
if (p.dataValid())
{
p.totalStudents();
if (base.ckBirthDate(p))
p.updateBirthDateTotal();
if (base.ckOldestBirthDate(oldestStudent))
oldestStudent.updateBirthDatetotal();
Profile.formatMonth();
p.writeStudentData();
p.readData();
}
}
System.out.println(p.getStudentId());
System.out.println(p.getBirthDateDay());
System.out.println(p.getBirthDateMonth());
System.out.println(p.getBirthDateYear());
}
public void readData()
{
Scanner input = new Scanner(System.in);
System.out.print("Enter a 3-digit student id:");
studentId = input.next();
System.out.print("Enter month of birth date: ");
birthDateMonth = input.nextInt();
System.out.print("Enter day of birth date: ");
birthDateDay = input.nextInt();
System.out.print("Enter year of birth date: ");
birthDateYear = input.nextInt();
}
public boolean dataValid (Profile stud)
{
boolean validate = true;
if ((birthDateMonth < 01)||(birthDateMonth > 12))
{
validate = false;
System.out.println("Month must be b/w the range 01-12 inclusive.");
}
if ((birthDateDay < 01) || (birthDateDay > 31))
{
validate = false;
System.out.println("Day must be b/w the range 01-31 inclusive.");
}
if ((birthDateYear < 1900) || (birthDateYear > 1999))
{
validate = false;
System.out.println("Year must be b/w the range 1900-1999 inclusive.");
}
return validate;
}
public void totalStudents()
{
totalStudents++;
}
public void updateBirthDateTotal()
{
birthDateTotal++;
}
public void formatMonth()
{
switch (birthDateMonth)
{
case 1: birthDateFormattedMon = "January";
break;
case 2: birthDateFormattedMon = "February";
break;
case 3: birthDateFormattedMon = "March";
break;
case 4: birthDateFormattedMon = "April";
break;
case 5: birthDateFormattedMon = "May";
break;
case 6: birthDateFormattedMon = "June";
break;
case 7: birthDateFormattedMon = "July";
break;
case 8: birthDateFormattedMon = "August";
break;
case 9: birthDateFormattedMon = "September";
break;
case 10:birthDateFormattedMon = "October";
break;
case 11:birthDateFormattedMon = "November";
break;
case 12:birthDateFormattedMon = "Decemember";
}
}
public boolean ckBirthDate (Profile stud)
{
return((birthDateMonth == stud.birthDateMonth) && (birthDateDay == stud.birthDateDay))?true:false;
}
public static void writeOutcomes()
{
System.out.println(totalStudents + "students were processed.");
System.out.println(birthDateTotal + "students had a February 29th birth date.");
}
public boolean ckOldestBirthDate(Profile p, Profile oldestStu)
{
boolean birthDate = false;
if (p.birthDateYear < oldestStu.birthDateYear)
birthDate = true;
else if (p.birthDateYear == oldestStu.birthDateYear)
if (p.birthDateMonth < oldestStu.birthDateMonth)
birthDate = true;
else if (p.birthDateMonth == oldestStu.birthDateMonth)
if (p.birthDateDay < oldestStu.birthDateDay)
birthDate = true;
else
birthDate = false;
else
birthDate = false;
else
birthDate = false;
return birthDate;
}
public void updateOldestBirthDate(Profile oldestStu, Profile p)
{
oldestStu = p;
}
public static void writeStudentData(Profile p)
{
System.out.println("Student Id: " + p.studentId);
System.out.println("Birth Date: " + p.birthDateFormattedMon + p.birthDateDay + "," + p.birthDateYear);
}
}
student.09
5
Junior Poster
For the ckOldestBirthDate I suggest that following code take a time to stading it:
public static Profile checkOldestBirthDate(Profile firstStudent, Profile secondStudent) { Calendar calFirstStudent = Calendar.getInstance(); Calendar calSecondStudent = Calendar.getInstance(); calFirstStudent.set(firstStudent.getBirthDateYear(), firstStudent.getBirthDateMonth(), firstStudent.getBirthDateDay()); calSecondStudent.set(secondStudent.getBirthDateYear(), secondStudent.getBirthDateMonth(), secondStudent.getBirthDateDay()); return (calFirstStudent.after(calSecondStudent) ? secondStudent : firstStudent); }That function returns the oldest student
Also we haven't covered the syntax: ".after" and ".getInstance()"
moutanna
2
Posting Whiz
Look to the dataValid function it take a parameter.
moutanna
2
Posting Whiz
All the code in the main function is wrong!!
student.09
5
Junior Poster
oh, um how about the rest? is this much correct atleast?
public static void main (String[] args)
{
Profile p = new Profile();
Profile oldestStudent = new Profile(1999,12, 31);
Profile base = new Profile (02, 29);
p.readData();
moutanna
2
Posting Whiz
Yes!
student.09
5
Junior Poster
i'm not sure how to follow this through now :(
Here's a piece of the example program that I was trying to follow:
public static void main (String[] args)
{
Sale transaction = new Sale();
Sale base = new Sale ("567","123");
Scanner input = new Scanner (System.in);
String response;
System.out.print("Would you like to enter a transaction?(Yes/No)");
response = input.next();
while (!(response.equals("no")))
{
transaction.readData();
if (base.checkProduct(transaction))
transaction.updateProductValue();
if (base.checkSeller(transaction))
transaction.updateSellerValue();
System.out.print("Would you like to enter another transaction?(Yes/No)");
response = input.next();
}
System.out.println ("Results for salesperson" + base.getSelllerId();
Sale.writeTotals();
}
moutanna
2
Posting Whiz
not sure what you meant with your last post. But here's the answer to before at least to avoid the errors.
while (!(p.studentId.equals("000")))
{
if (p.dataValid(p))
{
p.totalStudents();
if (base.ckBirthDate(p))
p.updateBirthDateTotal();
if (base.ckOldestBirthDate(p,oldestStudent))
oldestStudent.updateBirthDateTotal();
p.formatMonth();
p.writeStudentData(p);
p.readData();
}
}
student.09
5
Junior Poster
um oh ok but aren't we missing the function: "updateOldestBirthDate" ?
moutanna
2
Posting Whiz
The messing one is writeStatistics I guess
student.09
5
Junior Poster
um sorry but also it's not working logically :(
student.09
5
Junior Poster
yes I guess the while loop isnt working properly, thats why its not getting out of it when you enter 000 to then writeStudentData
right?
moutanna
2
Posting Whiz
No ir gets out it's correct for me
student.09
5
Junior Poster
really? when i enter "000" for the studentid it still goes forth and asks me for the month and so forth heres the code i have:
import java.util.Scanner;
public class Profile
{
private String studentId;
private String birthDateFormattedMon;
private int birthDateMonth;
private int birthDateDay;
private int birthDateYear;
private static int totalStudents;
private static int birthDateTotal;
Profile()
{}
Profile (int bdayDay, int bdayMonth, int bdayYear, String studId)
{
birthDateDay = bdayDay;
birthDateMonth = bdayMonth;
birthDateYear = bdayYear;
studentId = studId;
}
public Profile(int year, int month, int day)
{
birthDateYear=year;
birthDateMonth=month;
birthDateDay=day;
}
public Profile(int month, int day)
{
birthDateMonth=month;
birthDateDay=day;
}
public int getBirthDateDay()
{
return birthDateDay;
}
public int getBirthDateMonth()
{
return birthDateMonth;
}
public int getBirthDateYear()
{
return birthDateYear;
}
public String getStudentId()
{
return studentId;
}
public static void main (String[] args)
{
Profile p = new Profile();
Profile oldestStudent = new Profile(1999,12, 31);
Profile base = new Profile (02, 29);
p.readData();
while(!(p.studentId.equals("000")))
{
if (p.dataValid(p))
{
p.totalStudents();
if (base.ckBirthDate(p))
p.updateBirthDateTotal();
if (base.ckOldestBirthDate(p, oldestStudent))
oldestStudent.updateBirthDateTotal();
p.formatMonth();
p.writeStudentData(p);
p.readData();
}
}
System.out.println(p.getStudentId());
System.out.println(p.getBirthDateDay());
System.out.println(p.getBirthDateMonth());
System.out.println(p.getBirthDateYear());
}
public void readData()
{
Scanner input = new Scanner(System.in);
System.out.print("Enter a 3-digit student id:");
studentId = input.next();
System.out.print("Enter month of birth date: ");
birthDateMonth = input.nextInt();
System.out.print("Enter day of birth date: ");
birthDateDay = input.nextInt();
System.out.print("Enter year of birth date: ");
birthDateYear = input.nextInt();
}
public boolean dataValid (Profile stud)
{
boolean validate = true;
if ((birthDateMonth < 01)||(birthDateMonth > 12))
{
validate = false;
System.out.println("Month must be b/w the range 01-12 inclusive.");
}
if ((birthDateDay < 01) || (birthDateDay > 31))
{
validate = false;
System.out.println("Day must be b/w the range 01-31 inclusive.");
}
if ((birthDateYear < 1900) || (birthDateYear > 1999))
{
validate = false;
System.out.println("Year must be b/w the range 1900-1999 inclusive.");
}
return validate;
}
public void totalStudents()
{
totalStudents++;
}
public void updateBirthDateTotal()
{
birthDateTotal++;
}
public void formatMonth()
{
switch (birthDateMonth)
{
case 1: birthDateFormattedMon = "January";
break;
case 2: birthDateFormattedMon = "February";
break;
case 3: birthDateFormattedMon = "March";
break;
case 4: birthDateFormattedMon = "April";
break;
case 5: birthDateFormattedMon = "May";
break;
case 6: birthDateFormattedMon = "June";
break;
case 7: birthDateFormattedMon = "July";
break;
case 8: birthDateFormattedMon = "August";
break;
case 9: birthDateFormattedMon = "September";
break;
case 10:birthDateFormattedMon = "October";
break;
case 11:birthDateFormattedMon = "November";
break;
case 12:birthDateFormattedMon = "Decemember";
}
}
public boolean ckBirthDate (Profile stud)
{
return((birthDateMonth == stud.birthDateMonth) && (birthDateDay == stud.birthDateDay))?true:false;
}
public static void writeOutcomes()
{
System.out.println(totalStudents + "students were processed.");
System.out.println(birthDateTotal + "students had a February 29th birth date.");
}
public boolean ckOldestBirthDate(Profile p, Profile oldestStu)
{
boolean birthDate = false;
if (p.birthDateYear < oldestStu.birthDateYear)
birthDate = true;
else if (p.birthDateYear == oldestStu.birthDateYear)
if (p.birthDateMonth < oldestStu.birthDateMonth)
birthDate = true;
else if (p.birthDateMonth == oldestStu.birthDateMonth)
if (p.birthDateDay < oldestStu.birthDateDay)
birthDate = true;
else
birthDate = false;
else
birthDate = false;
else
birthDate = false;
return birthDate;
}
public void updateOldestBirthDate(Profile oldestStu, Profile p)
{
oldestStu = p;
}
public static void writeStudentData(Profile p)
{
System.out.println("Student Id: " + p.studentId);
System.out.println("Birth Date: " + p.birthDateFormattedMon + p.birthDateDay + "," + p.birthDateYear);
}
}
moutanna
2
Posting Whiz
Yes it asks for month day and year but it get out after that!
moutanna
2
Posting Whiz
So we have to chage so thing inside the readData I guess.
moutanna
2
Posting Whiz
Try this please:
public void readData()
{
Scanner input = new Scanner(System.in);
System.out.print("Enter a 3-digit student id:");
studentId = input.next();
if(studentId.equals("000")) return;
System.out.print("Enter month of birth date: ");
birthDateMonth = input.nextInt();
System.out.print("Enter day of birth date: ");
birthDateDay = input.nextInt();
System.out.print("Enter year of birth date: ");
birthDateYear = input.nextInt();
}
student.09
5
Junior Poster
oh i see what you mean so yes the only problem left is the outcomes/results
moutanna
2
Posting Whiz
And maybe we have to make a treate if th number of digits is not egale to 3!!!
moutanna
2
Posting Whiz
I did not like this too:
p.dataValid(p);This is not convinient even if is not false.
moutanna
2
Posting Whiz
That's why I made some little chage here is my version (draft of cours).
import java.util.Scanner;
public class Profile
{
private String studentId;
private String birthDateFormattedMon;
private int birthDateMonth;
private int birthDateDay;
private int birthDateYear;
private static int totalStudents;
private static int birthDateTotal;
Profile()
{}
Profile (int bdayDay, int bdayMonth, int bdayYear, String studId)
{
birthDateDay = bdayDay;
birthDateMonth = bdayMonth;
birthDateYear = bdayYear;
studentId = studId;
}
public Profile(int year, int month, int day)
{
birthDateYear=year;
birthDateMonth=month;
birthDateDay=day;
}
public Profile(int month, int day)
{
birthDateMonth=month;
birthDateDay=day;
}
public int getBirthDateDay()
{
return birthDateDay;
}
public int getBirthDateMonth()
{
return birthDateMonth;
}
public int getBirthDateYear()
{
return birthDateYear;
}
public String getStudentId()
{
return studentId;
}
public void readData()
{
Scanner input = new Scanner(System.in);
System.out.print("Enter a 3-digit student id:");
studentId = input.next();
if(studentId.equals("000")) return;
System.out.print("Enter month of birth date: ");
birthDateMonth = input.nextInt();
System.out.print("Enter day of birth date: ");
birthDateDay = input.nextInt();
System.out.print("Enter year of birth date: ");
birthDateYear = input.nextInt();
}
public static boolean dataValid (Profile stud)
{
boolean validate = true;
if ((stud.getBirthDateMonth() < 01)||(stud.getBirthDateMonth() > 12))
{
validate = false;
System.out.println("Month must be b/w the range 01-12 inclusive.");
}
if ((stud.getBirthDateDay() < 01) || (stud.getBirthDateDay() > 31))
{
validate = false;
System.out.println("Day must be b/w the range 01-31 inclusive.");
}
if ((stud.getBirthDateYear() < 1900) || (stud.getBirthDateYear() > 1999))
{
validate = false;
System.out.println("Year must be b/w the range 1900-1999 inclusive.");
}
return validate;
}
public static void totalStudents()
{
totalStudents++;
}
public void updateBirthDateTotal()
{
birthDateTotal++;
}
public void formatMonth()
{
switch (birthDateMonth)
{
case 1: birthDateFormattedMon = "January";
break;
case 2: birthDateFormattedMon = "February";
break;
case 3: birthDateFormattedMon = "March";
break;
case 4: birthDateFormattedMon = "April";
break;
case 5: birthDateFormattedMon = "May";
break;
case 6: birthDateFormattedMon = "June";
break;
case 7: birthDateFormattedMon = "July";
break;
case 8: birthDateFormattedMon = "August";
break;
case 9: birthDateFormattedMon = "September";
break;
case 10:birthDateFormattedMon = "October";
break;
case 11:birthDateFormattedMon = "November";
break;
case 12:birthDateFormattedMon = "Decemember";
}
}
public boolean ckBirthDate (Profile stud)
{
return((birthDateMonth == stud.birthDateMonth) && (birthDateDay == stud.birthDateDay))?true:false;
}
public static void writeOutcomes()
{
System.out.println(totalStudents + "students were processed.");
System.out.println(birthDateTotal + "students had a February 29th birth date.");
}
public boolean ckOldestBirthDate(Profile p, Profile oldestStu)
{
boolean birthDate = false;
if (p.birthDateYear < oldestStu.birthDateYear)
birthDate = true;
else if (p.birthDateYear == oldestStu.birthDateYear)
if (p.birthDateMonth < oldestStu.birthDateMonth)
birthDate = true;
else if (p.birthDateMonth == oldestStu.birthDateMonth)
if (p.birthDateDay < oldestStu.birthDateDay)
birthDate = true;
else
birthDate = false;
else
birthDate = false;
else
birthDate = false;
return birthDate;
}
public void updateOldestBirthDate(Profile oldestStu, Profile p)
{
oldestStu = p;
}
public static void writeStudentData(Profile p)
{
System.out.println("Student Id: " + p.studentId);
System.out.println("Birth Date: " + p.birthDateFormattedMon + p.birthDateDay + "," + p.birthDateYear);
}
public static void main (String[] args)
{
Profile p = new Profile();
Profile oldestStudent = new Profile(1999,12, 31);
Profile base = new Profile (02, 29);
p.readData();
while (!(p.studentId.equals("000")))
{
if (Profile.dataValid(p))
{
Profile.totalStudents();
if (base.ckBirthDate(p))
p.updateBirthDateTotal();
if (base.ckOldestBirthDate(p,oldestStudent))
oldestStudent.updateBirthDateTotal();
p.formatMonth();
Profile.writeStudentData(p);
p.readData();
}
}
System.out.println(p.getStudentId());
System.out.println(p.getBirthDateDay());
System.out.println(p.getBirthDateMonth());
System.out.println(p.getBirthDateYear());
}
}
student.09
5
Junior Poster
ok so i finished adding and making changes to this program, everything runs well and outputs just not the birth date of the oldest student. Would that be a logic error or syntax in the objects?
moutanna
2
Posting Whiz
Well I got this out put for the Oldest student:
null31,1999is the birth date of the oldest student.
is this what you get?
student.09
5
Junior Poster
yes!!!
that's what i'm talking about, i dont know why the month is becoming null but the day and year are the preset ones, they shouldn't be. the current student values should have been copied/transferred over. You get what i mean?
moutanna
2
Posting Whiz
First;
Look at this:
//Here the oldestStudent is caled first
oldestStudent.updateOldestBirthdate(oldestStudent, student);And this:
//but in the daclaration it is a second parameter
public boolean checkOldestBirthdate (Record stu, Record oldestStu)But that did not resolve the questin juste make a change Ok?
student.09
5
Junior Poster
oh i see what you mean there, i didn't know the order made a difference, but yes i went ahead and made that change!
moutanna
2
Posting Whiz
Please let me now about a chages you made to update my code
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