Thread: Save array to text file

I have an array [a, b, c, d] that I wish to save to a .txt file. My code allows a user to edit a specific line of text file as it deletes the rest of the files contents on edit I have decided to save the contents of a file into an array. I then want to save the contents of the array back into the text file.

import java.io.*;
import java.util.*;
 
public class LineNumberReaderExample {
    public static void main(String[] args) throws Exception {               
            boolean foundIt = false;
            Scanner input=new Scanner(System.in);
            System.out.print("Enter record to edit ");
            String word=input.next();
            File f=new File("file.txt");
            BufferedReader freader;
            freader = new BufferedReader(new FileReader(f));
            String s;
            List<String> list = new ArrayList<String>();
            while((s = freader.readLine()) != null) {
                   list.add(s);
                   System.out.print(list);
                   if(s.startsWith(word)){
                   while(foundIt == false) {
                   System.out.print(s);
                   foundIt = true;
                   System.out.print("Replace With: ");
                   String newtext=input.next();
                   FileWriter writer = new FileWriter("file1.txt");
                   writer.write(s.replace(s, newtext));
                   writer.close();
                   list.add(newtext);
                }
             }               
 
        System.out.println(list);
        // NEED CODE TO SAVE ARRAY TO FILE // 
         } 
    }
}

I have now edited my thread to include my whole program

I have a text file that includes [a, b, c, d], when this program is run it adds the elements to an array and allows the user to replace an element.

For example if a user replaces "d" with "e" the file will be saved to array, so the array looks like [a, b, c, e].

I'm having problems with saving said array back into the text file

The text file has several lines,
a
b
c
d

The code runs through each line until it finds what it is looking for, what the user entered, whilst it is doing this it adds the lines into an array. After the string is found it then adds the remaining lines to an array.

So if the user was looking for "c" the system would run as follows:

Line 1 - a. Array = [a]. C NOT FOUND
Line 2 - b. Array = [a, b]. C NOT FOUND
Line 3 - C. Array = [a, b, c]. C FOUND
***User replaces "c" with "e"***
c removed from array. Array = [a, b]
e added to array. Array = [a, b, e]
Line 4 - d, Array = [a, b, e, d]

At this point I want to add the array [a, b, e, d] to a text file and I don't know how to do this.

Sorry yes my ArrayList, if I write a loop that gets each element it will just overwrite the file each time it loops so I will end up with a file that just has the last element in it. Or is there a way to add a new line of text into a text file? I'm new to Java

I've solved it, thank you for the loop sugestion.

for (int i = 0; i < list.size(); i++)
                writer.write(list.get(i) + "\r\n");
                writer.close();