Problem With File Reading And Sorting

Question

I'm having problems with a particular task. Here is what I have to do:
Write a program which reads 100 integers from a file. Store these integers
in an array in the order in whcih they are read. Print them to the screen.
Sort the integers in place using bubble sort. Print the sorted array to the
screen. Now implement the sieve of Eratosthenes to place all prime numbers
in an ArrayList. Print that list to the screen.
Here is the code I have so far:
import java.util.ArrayList;
import java.io.*;
public class Eratosthenes
    private ArrayList numbers;
    private String inputfile1 = "numbers.txt";
    public Eratosthenes()
        numbers = new ArrayList();
    public void readData()
        try {
            BufferedReader reader = new BufferedReader(new FileReader(inputfile1));
            for(int i = 1; i <= 100; i++) {
                String temp = reader.readLine();
                numbers.add();
        catch(Exception e)
This is the file reading part I have done but it doesn't recognise the line numbers.add() . It brings up the error - 'Cannot resolve symbol - method add(). Thats the first problem I have, can anyone see any way to fix it and to achieve the task. Also can someone help with the structure of a bubble sort method and a sieve of Eratosthenes method as I have no clue whatsoever. Any help will be greatly appreciated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

Answer 1

Ok, I've done that but I'm having another problem. When I'm printing an output to the screen, it prints 100 lines of integers and not 1 line of 100 integers. Can you see the problem in the code that is doing this?
import java.util.ArrayList;
import java.io.*;
public class Eratosthenes
    private ArrayList numbers;
    private String inputfile1 = "numbers.txt";
    public Eratosthenes()
        numbers = new ArrayList();
    public void readData()
        try {
            BufferedReader reader = new BufferedReader(new FileReader(inputfile1));
            for(int i = 1; i <= 100; i++) {
                String temp = reader.readLine();
                numbers.add(temp);
                System.out.println(numbers);
        catch(Exception e)
}