Editing a for loop to print correctly

Question

I have the following code
public void printReceipts(){
          JOptionPane frame = new JOptionPane();
          for(int i = 0; i < borrowersList.size();i++){
               for(int j = 0; j < books.size();j++){
                    if(borrowersList.get(i).getLibraryNumber().equals(books.get(j).getLibraryCardNumber())){
                         milliLate = (tempDate.getTime() - books.get(j).getReturnDate().getTime());
                         daysLate = (milliLate/ 86400000);
                         bookDebt = (daysLate * 2);
                         borrowersList.get(i).setDebt(bookDebt);
                         JOptionPane.showMessageDialog(frame, borrowersList.get(i).getName() + "\n"
                                   + borrowersList.get(i).getStreetAddress() + "\n"
                                   + borrowersList.get(i).getPostalCode() + " "
                                   + borrowersList.get(i).getCity() + " \n"
                                   + "\n" + "As of today " + tempDate + " you owe \"The little library \"" +borrowersList.get(i).getDebt() + " kr for the books."  + "\n"
                                   + "\n" + books.get(j).getAuthor() + " " + books.get(j).getTitle() + ", amount due "+ bookDebt +
          }which prints borrowers that owe the library money.
The problem is that if a borrower has 2 books, it will print the loop each time with the different book.
i.e
Wile E. Coyote
The Second Valley from the Left
987 65 The Desert
As of today 2007 09 20 you owe "The little library" 300 kr for the books
James Joyces Ulysses, amount due 96:-
Wile E. Coyote
The Second Valley from the Left
987 65 The Desert
As of today 2007 09 20 you owe "The little library" 230 kr for the books
Fyodor Dostoyevsky Crime and Punishment, amount due 134:-
I would like it to print out only once for each borrower
i.e.
Wile E. Coyote
The Second Valley from the Left
987 65 The Desert
As of today 2007 09 20 you owe "The little library" 300 kr for the books
James Joyces Ulysses, amount due 96:- (book line)
Fyodor Dostoyevsky Crime and Punishment, amount due 134:-
Aldous Huxley Brave New World, amount due 70:-
So I need to store all the book lines of each borrower and then call them once all the borrowed books debts have been assigned.

Answer 1

Implode wrote:
CeciNEstPasUnProgrammeur wrote:
You could have a method that takes the list of books (or even the borrower) and provides you with a String containting all you want to print... then you'd call this method only once and print out what you want.I thought of this, but I would need each book line to be on a separate line?
public void setPrintDetails(String row){
          this.row = row + this.row
Use a StringBuilder/StringBuffer:
private StringBuilder details;
public void setPrintDetails(String row) {
   details.append(row).append("\n");
}You could also use the line.separator property instead.