import java.util.*;
class Entry{
	private String first;
	private String last;
	private String address;
	private String email;
	Entry(String fir, String las, String adrs, String mail){
		first = fir;
		last = las;
		address = adrs;
		email = mail;
	}
	Entry(){
		first = last = address = email = null;
	}
	public void displayEntries(){
		System.out.println("====================================");
		System.out.println("First Name: "+first);
		System.out.println("Last Name: "+last);
		System.out.println("Address: "+address);
		System.out.println("Email: "+email);
		System.out.println("====================================");
	}
	public void addEntry(int n, String value){
		switch (n){
		case 1:
			first = value;
			break;
		case 2:
			last = value;
			break;
		case 3:
			address = value;
			break;
		case 4:
			email = value;
			break;
		}
	}
	public void removeEntry(int n){
		switch (n){
		case 1:
			first = null;
			break;
		case 2:
			last = null;
			break;
		case 3:
			address = null;
			break;
		case 4:
			email = null;
			break;
		}
	}
	public void editEntry(int n, String value){
		switch (n){
		case 1:
			first = value;
			break;
		case 2:
			last = value;
			break;
		case 3:
			address = value;
			break;
		case 4:
			email = value;
			break;
		}
	}
	private void sort(int n, ArrayList<Entry> a){
		switch (n){
		case 1:
			for (int i = 0;i<a.size();i++){
				for (int j = 0;j<a.size();j++)
					if (a.get(j).first.compareTo(a.get(i).first)>0){
						Entry temp = a.get(i);
						a.set(i, a.get(j));
						a.set(j, temp);
					}
			}
			break;
		case 2:
			for (int i = 0;i<a.size();i++){
				for (int j = 0;j<a.size();j++)
					if (a.get(j).last.compareTo(a.get(i).last)>0){
						Entry temp = a.get(i);
						a.set(i, a.get(j));
						a.set(j, temp);
					}
			}
			break;
		case 3:
			for (int i = 0;i<a.size();i++){
				for (int j = 0;j<a.size();j++)
					if (a.get(j).address.compareTo(a.get(i).address)>0){
						Entry temp = a.get(i);
						a.set(i, a.get(j));
						a.set(j, temp);
					}
			}
			break;
		case 4:
			for (int i = 0;i<a.size();i++){
				for (int j = 0;j<a.size();j++)
					if (a.get(j).email.compareTo(a.get(i).email)>0){
						Entry temp = a.get(i);
						a.set(i, a.get(j));
						a.set(j, temp);
					}
			}
			break;
		}
	}

}
public class AddressBook {
	public static void main(String[] args){
		Scanner s = new Scanner(System.in);
		ArrayList<ArrayList<Entry>> library= new ArrayList<ArrayList<Entry>>();
		for (int i=0;i<10;i++){
			library.add(new ArrayList<Entry>());
				for ( int j = 0;j<10;j++){
					library.get(i).add(new Entry());
				}
		}
		boolean finished = false;
		ArrayList<Entry> currentBook = library.get(0);
		Entry currentEntry = currentBook.get(0);
		while(finished==false){
			System.out.println("Selected Address Book: Book "+(library.indexOf(currentBook)));
			System.out.println("Selected Entry: "+currentBook.indexOf(currentEntry));
			currentEntry.displayEntries();
			System.out.println("1. Add Entry");
			System.out.println("2. Remove Entry");
			System.out.println("3. Edit Entry");
			System.out.print("4. Sort Book\n>");
			switch (s.nextInt()){
			case 1:
				System.out.println("Which field to add to?");
				System.out.println("1. First Name");
				System.out.println("2. Last Name");
				System.out.println("3. Address");
				System.out.print("4. Email\n>");
				switch(s.nextInt()){
				case 1:
					System.out.print("Add what? ");
					currentEntry.addEntry(1, s.next());
					break;
				case 2:
					System.out.print("Add what? ");
					currentEntry.addEntry(2, s.next());
					break;
				case 3:
					System.out.print("Add what? ");
					currentEntry.addEntry(3, s.next());
					break;
				case 4:
					System.out.print("Add what? ");
					currentEntry.addEntry(4, s.next());
					break;
				}
			currentEntry.displayEntries();
			break;
			case 2:
				System.out.println("Which field to remove?");
				System.out.println("1. First Name");
				System.out.println("2. Last Name");
				System.out.println("3. Address");
				System.out.println("4. Email");
				currentEntry.removeEntry(s.nextInt());
				currentEntry.displayEntries();
				break;
			case 3:
				System.out.println("Which field to edit?");
				System.out.println("1. First Name");
				System.out.println("2. Last Name");
				System.out.println("3. Address");
				System.out.println("4. Email");
				switch(s.nextInt()){
				case 1:
					System.out.print("Edit to what? ");
					currentEntry.editEntry(1, s.next());
					break;
				case 2:
					System.out.print("Edit to what? ");
					currentEntry.editEntry(2, s.next());
					break;
				case 3:
					System.out.print("Edit to what? ");
					currentEntry.editEntry(3, s.next());
					break;
				case 4:
					System.out.print("Edit to what? ");
					currentEntry.editEntry(4, s.next());
					break;
				}
			case 4:
				System.out.println("Which field to sort?");
				System.out.println("1. First Name");
				System.out.println("2. Last Name");
				System.out.println("3. Address");
				System.out.println("4. Email");
			default:
				System.out.print("That's not on the list");
				break;
			}
		}
	}
}