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java help

 
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  #1
Dec 9th, 2008
Student database creating a program that will be used to manipulate a student database. This portion of the database will keep track of student data to include the students name(first, middle, last), date-of-birth, the student's id number, the student's major, and the student's GPA.Based arrays and objects,use 2 parallel arrays of references that point to the objects. The first array will be an array of references pointing to Student objects. Each object will contain the students' name (first, middle, last), id number, major, and GPA. Each element in the array will point (be a reference) to a different Student object. need to create a Student class that contains a student's first, middle, and last name, a student id number, major, and GPA (these will be the data members). This class should have 2 constructors, accessors for each data member, a single mutator member to reset the student data (name,id number, major, and GPA). class should also have a toString() method to print out the data as well as an equals method to compare two student names for equality.
A second parallel array should be an array of references to Date objects that will house the birthdates for each student member. (i already written the Date class
java Syntax (Toggle Plain Text) 
  1. public class Date
  2. {
  3.  
  4.  private int month; 
  5.  private int day;
  6.  private int year;
  7.  
  8. //-------constructor--------------------------------
  9. public Date()
  10. {
  11.  
  12. month = 01; 
  13. day = 01;
  14. year = 01;
  15. }
  16. public Date(int mt,int ds,int yr)
  17.          {
  18. //setDate(mt, ds, yr);
  19. month = mt;
  20. day = ds;
  21. year = yr;
  22.  
  23.          }
  24.  
  25. //--------------mutator--------------------------			
  26.   public void setDate(int mt, int ds,int yr)
  27.                   {
  28.                if (1 <= yr) 
  29.                  year = yr;
  30. 					    else
  31. 						   yr = 1;
  32.  
  33.                  if (1 <= mt && mt <= 12)
  34.                      month = mt;
  35. 							else if (0 < mt && mt >12)
  36. 							 System.out.println(" The month " + mt + " is invalid"); 
  37.  
  38.  
  39.                 if (1 <= ds && ds <= 31)
  40.                         day = ds;
  41. 								else if (0 < ds && ds > 31)
  42. 								System.out.println(" The day " + ds + " is invalid");								
  43. 								else if (0 < ds && ds > 29)
  44. 								System.out.println(" The day  for Febuary " + ds + " is invalid"); 
  45. 														}
  46.  
  47. //---------------accesor-----------------------------
  48. public int getYears()
  49. {
  50. return year;
  51. }
  52. public int getMonths()
  53. {
  54. return month;
  55. }
  56. public int getDays()
  57. {
  58. return day;
  59. }
  60.  
  61. //---------------------------------------------
  62. public boolean  checkDate()
  63.  { 
  64.   switch (month)
  65.   {
  66.    case 4: case 6: case 9: case 11: 
  67. 	 if (day <= 30)
  68. 	 return true;
  69.  
  70. 	break;	
  71.  
  72.        case 1: case 3: case 5: case 7: case 8: case 10:case 12:
  73.  
  74. 	 if(day <= 31)
  75. 	 return true; 
  76. 		break;
  77.  
  78.   case 2: 
  79.      if (day <= 28 && !isLeapYear(year))
  80. 	return true;
  81. 	else if (day <= 29 && isLeapYear(year))
  82. 	return true;
  83.  
  84. 		break;
  85.  
  86. 	}
  87.  return false;
  88. }
  89.  public boolean isLeapYear(int years)
  90.     {
  91. 	boolean isLeap = false;
  92.  
  93. 	if(((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) 
  94. 	{
  95. 	System.out.print(year + " is a leap year");
  96. 	isLeap = true;
  97. 	}
  98.  
  99. 	else
  100. 	System.out.println(year + " is not a leap year"); 
  101. 	System.out.flush();
  102.  
  103. 	return isLeap;
  104.     }
  105.  
  106. 	public void makeCopy(Date otherDate)
  107.     {
  108.         month = otherDate.month;
  109.         day = otherDate.day;
  110.         year = otherDate.year;
  111.     }
  112.  
  113.  
  114.     public Date getCopy()
  115.     {
  116. 	    Date temp = new Date();
  117.  
  118. 	    temp.month = month;
  119. 	    temp.day = day;
  120. 	    temp.year = year;
  121.  
  122. 	    return temp;
  123.     }
  124. public void printDate()
  125. {
  126. System.out.println(month + "/" + day + "/" + year);
  127. }
  128. }


Since these are parallel arrays, the data for student[i] in the student array will correspond
with birthdate[i] in the birthday array. Both of the parallel arrays will be located in driver (main) program. The Student Class and the Date class will be located in the same folder along with driver program, so that driver program can access these classes and their
methods as needed.

What program should do (Tasks):

i) Read data in from an external file that
ii) Print (to the screen) all the data for any given student (including the birthdate)
in an easy readable format.
ii) Your program should prompt the user for the name of a student, search through the list, and be able to print out the data for that student.
ii) Your program should prompt the user for a month (as an integer) be able to print out a list of all students who have birthdays in that month and wish them a Happy Birthday.

Structure of Program:
In a single folder should have a Date Class file, a Student Class file, the infile, and the main driver program.
The driver program (main) will contain the 2 parallel arrays.

outfile:
Doc David Dwarf 007 ComputerScience 4.0 01 01 1980
Grumpy Nat Gannon 120 Engineering 3.8 11 11 1989
Happy Jose Carreras 008 PreMed 3.5 03 04 1985
Sleepy Sam Smith 101 English 3.0 06 15 1887
Dopey Dan Doughnut 009 PoliticalScience 2.5 02 02 1887
Sneezy Salvadore Smith 198 Nursing 2.4 06 12 1990
Bashful Bob O'Brennan 101 ComputerScience 2.8 11 20 1888
Last edited by Ancient Dragon; Dec 9th, 2008 at 2:34 am. Reason: add code tags
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Re: java help

 
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  #2
Dec 9th, 2008
And your question is?
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Re: java help

 
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  #3
Dec 9th, 2008
same remark here... and.. yet another (two)
why don't you use the (already existing) Date class? (java.util.Date)
if you do want to write your own, wouldn't it be better to give it another name, to avoid confusion? something like 'MyDate.java'
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star100 star100 is offline Offline
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Re: java help

 
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Dec 9th, 2008
how can i code for student data base using this information?
What program should do (Tasks):

i) Read data in from an external file that
ii) Print (to the screen) all the data for any given student (including the birthdate)
in an easy readable format.
ii) Your program should prompt the user for the name of a student, search through the list, and be able to print out the data for that student.
ii) Your program should prompt the user for a month (as an integer) be able to print out a list of all students who have birthdays in that month and wish them a Happy Birthday.

Structure of Program:
In a single folder should have a Date Class file, a Student Class file, the infile, and the main driver program.
The driver program (main) will contain the 2 parallel arrays.
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Re: java help

 
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Dec 9th, 2008
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Originally Posted by mahlerfive View Post
And your question is?
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Originally Posted by star100 View Post
how can i code for student data base using this information?
I don't think that's what mahlerfive meant when he asked what your question was. You simply reposted the assignment, then asked how to code it. You need to make an attempt and then ask a more SPECIFIC question regarding some aspect of the assignment, and it needs to show some effort on your part.
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