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Arrays

1 reply on 1 page. Most recent reply: Mar 2, 2002 8:00 PM by Charles Bell

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Hoody

Posts: 33
Nickname: hoodlum
Registered: Feb, 2002

Arrays

Posted: Feb 25, 2002 9:53 AM

the task of this assignment is to make a database so you can add to the database a faculty, staff, and student and list them. I am supposed to add methods to sort the database by year of birth, a method to remove a person from the databse by searching the name and then removing it.
now i did most of this and i am able to add person list all but i cant get the sort year method to work and when i used the remove person code i had it doesnt remove the person but it adds that person and says null. I am kinda lost now and i know its pathetic but if anyone could help I would be grateful and if now then its alright. heres the code i got so far....

public class Database
{

private Person[] personArray;
private int personCount = 0;

/**
* Create a new, empty person database.
*/
public Database()
{
personArray = new Person[20];
}

/**
* Add a person to the database.
* @param aPerson the person to add
*/
public void addPerson(Person aPerson)
{
personArray[personCount] = aPerson;
personCount++;
}

/**
* Sort the array by the year of birth.
*/
public void sortYear()
{
int i= 0;
int position = -1;
boolean found = false;

while (i < personCount && !found)
{
if (personArray.getYearOfBirth() > 1800)
{
position = i;
found = true;

}
i++;

}

}
/**
* Remove a person from the database.
* @param rPerson the person to remove
*/
public void removePerson(Person rPerson)
{
Person[] tempArray = new Person[personCount];
int nonMatch = 0;
//This will remove the matching item

for (int count = 0; count < personCount; count++)
{
if ((personArray[count] == rPerson))
{
tempArray[nonMatch] = personArray[count];
nonMatch++;
}
personCount--;
}

//This will place the good items back in the personArray
for (int good = 0; good < personCount; good++)
{
personArray[good] = tempArray[good];
}

}

/**
* List all the persons currently in the database on standard out.
*/
public void listAll ()
{
for (int i = 0; i < personCount; i++)
{
Person aPerson = (Person)personArray;
System.out.println(personArray);
}
}

}

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: Arrays

Posted: Mar 2, 2002 8:00 PM

You need to create a class called Person with any necessary data fields to hold the data on a given person, such as name, position, etc.
then in you Database program create and add Person objects to a Vector object Persons.

Vectors are easier to add elements to, delete elements from, etc. because they grow with data size.

class Person{
      String name = "";
      String position = "";
 
      public Person(String name, String position){
            this.name = name;
            this.position = position;
      }
}

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