Hi,

Please help!! I have been trying to see a solution to this for days, and every time I think I have a solution something goes wrong.

I am basically trying to write a manager class that will allow a user to add, delete and search for a borrower, as defined in a Borrower and BorrowerList class. The only problem is that I'm really struggling with the implementation of this in the BorrowerListManager class. So far I have the following code,

1. Borrower class,

package videos;

import simplejava.*;

public class Borrower extends Person {//allows use of methods, variables and constructor from Person class
private int membNum;
private int borrowerLimit;

public Borrower(int mn, int limit, String fn, String sn, String tele, String emailAddress) {
super(fn, sn, tele, emailAddress);
membNum = mn;
borrowerLimit = limit;
}

public Borrower(SimpleReader in) {//gets constructor from Person class and adds Borrower specific constructors
super(in); //for membership number and borrower limit
membNum = in.readInt();
borrowerLimit = in.readInt();
}

public int getBorrowerLimit() {
return borrowerLimit;
}

public void setBorrowerLimit(int limit) {
borrowerLimit = limit;
}

public int getMembNum() {
return membNum;
}

public void setMembNum(int mn) {
membNum = mn;
}

public void saveTo(SimpleWriter out) {
out.println(getForename()+" "+getSurname()+" "+getTelephoneNumber()+" "+getEmailAddress()
+" "+membNum+" "+borrowerLimit);
}//saveTo method writes details of the Borrower class to a text file

public String toString() {
return getForename()+" "+getSurname()+" "+getTelephoneNumber()+" "+getEmailAddress()+
" Membership Number = "+membNum+" Borrower Limit = "+borrowerLimit+" "; }
//toString method calling methods from Person class and membership and borrower details
//from within this class
}



2. BorrowerList class,

package videos;

import simplejava.*;

public class BorrowerList {

private int maxBorrowers, borrowerCount;

private Borrower[] borrowerArray;
private int numBorrowers;
Node runner;
Node previous;


public BorrowerList(int max) {
borrowerCount = 0; maxBorrowers=max;
borrowerArray = new Borrower[max];
}

public BorrowerList() {
this(1000000);
}

public BorrowerList(SimpleReader in) {
this(in.readInt());
int entries = in.readInt();
for (int i = 0; i<entries; i++)
add(new Borrower(in));
for (int i=0; i<entries; i--)
delete(new Borrower(in));
}

public int getSize() {
return borrowerCount;
}

public boolean add(Borrower newItem) {
if (borrowerCount<maxBorrowers) {
borrowerArray[borrowerCount] = newItem;
borrowerCount++;
return true;
} else return false;
}

public boolean delete(Borrower oldItem) {
if (borrowerCount<maxBorrowers)
{ borrowerArray[borrowerCount] = oldItem;
borrowerCount--;
return true;
}
else return false;
}

public Borrower getBorrower(int i) {
if (i<0 || i>=borrowerCount)
return null;
else return borrowerArray[i];
}

public Borrower lookUp(int requiredNum) {
boolean found = false;
int next = 0;

while (!found && (next<borrowerCount)) {
if ( borrowerArray[next].getMembNum() == requiredNum)
found = true;
else next++;
}
if (found) return borrowerArray[next];
else return null;
}

public void saveTo(SimpleWriter out) {
int next;
out.println(maxBorrowers+" "+borrowerCount);
for (next=0; next<borrowerCount; next++)
borrowerArray[next].saveTo(out);
}

public String toString() {
int next;
String result = "";
result+= "Borrower Count = "+" "+borrowerCount;
result+= ", Max Borrowers ="+maxBorrowers;
for (next=0; next<borrowerCount; next++)
result+= "\n"+borrowerArray[next];
return result;
}

}



3. BorrowerListManager class,

package videos;


import simplejava.*;

public class BorrowerListManager{

private BorrowerList borrowers;

SimpleWriter screen = new SimpleWriter();
SimpleReader keyboard = new SimpleReader();
BorrowerList newBorrower;

public BorrowerListManager(BorrowerList borrowers) {
this.borrowers=borrowers;
}


public void run() {
BorrowerList borrowerSelected = null;
String nextLine;
char choice;
do
{
String permitted;
if (borrowerSelected == null) {
screen.println("a - add, f - find, q - Quit --> ");
permitted = "AaFfQq";
} else {
screen.println("Current borrower: " + borrowerSelected);
screen.println("a - add, d - delete, f - find, q - Quit --> ");
permitted = "AaDdFfEeQq";
}
nextLine = keyboard.readLine();
choice = nextLine.charAt(0);
if (permitted.indexOf(choice)>=0) {
switch (choice) {
case 'A':
case 'a':
borrowerSelected = addBorrower(newBorrower);
break;
case 'D':
case 'd':
deleteBorrower(borrowerSelected);
borrowerSelected = null;
break;
case 'F':
case 'f':
borrowerSelected = findBorrower();
break;
case 'Q':
case 'q':
break;
}
} else System.out.println("Unrecognised option.");
} while (choice != 'q' && choice != 'Q');
}

private void addBorrower(BorrowerList newBorrower) {

boolean result = borrowers.add(newBorrower);
System.out.println("New borrower added? "+result);

}

private void deleteBorrower(BorrowerList b) {

}

private Borrower findBorrower() {
return borrower;
}
}



Any help or advice would be really appreciated!! :confused: