Week 7: Enum, Generic Type, Streams, write to file, class diagram/12B. Names to a File

Write a program that asks the user for names.
The given names are added to a file named 'names.txt' such that each name is on its own line.
When the user enters the name "stop", the program execution ends.




import java.util.Random;
import java.util.ArrayList;
import java.util.Arrays;
import java.io.FileNotFoundException;
import java.util.Collections;
import java.util.Scanner;



public class Test{
    public static void main(String[] args){
        final Random r = new Random();


        //ADD
        Scanner reader = new Scanner(System.in);
        ArrayList<String> names = new ArrayList<String>();

        // get user input 'name'
        while (true) {
            System.out.print("Enter a name: ");
            String name = String.valueOf(reader.nextLine());

            // break if user inputs "stop"
            if (name.equals("stop")) {
                break;
            }

            // add name to ArrayList
            names.add(name);          
        }

        
        // add name to the file, separated by newline "\n"
        try (PrintWriter file = new PrintWriter("names.txt")) {
            names.forEach(name -> file.write(name + "\n"));
        }
        catch (FileNotFoundException e) {
            System.out.println("An error occurred: " + e);
        }
    

        System.out.println("File content:");
        
    }
}


Enter a name: Jack
Enter a name: Sophie
Enter a name: Oliver
Enter a name: Harry
Enter a name: Harry
Enter a name: Jack
Enter a name: Sophie
Enter a name: Lily
Enter a name: Oliver
Enter a name: Emily
Enter a name: Emily
Enter a name: Lily
Enter a name: stop


File content:
Jack
Sophie
Oliver
Harry
Harry
Jack
Sophie
Lily
Oliver
Emily
Emily
Lily