Question

Make a program to read a file, filled with words separated by new lines, from command line arguments (args[0]), print the file, and then add each word into an arraylist.

After making the arraylist, iterate through it and print its contents.

Answer 1

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;

public class PrintFileWords {

    public static void main(String[] args) {
        if (args.length > 0) {
            Scanner in = new Scanner(System.in);
            File file = new File(args[0]);
            try {
                Scanner fin = new Scanner(file);
                System.out.println("sample file: " + args[0]);
                ArrayList<String> list = new ArrayList<>();
                while (fin.hasNext()) {
                    list.add(fin.nextLine());
                }
                for (int i = 0; i < list.size(); i++) {
                    System.out.println(list.get(i));
                }
                fin.close();
            } catch (FileNotFoundException e) {
                System.out.println(file.getAbsolutePath() + " is not found!");
            }
            in.close();
        } else {
            System.out.println("Please provide file name as command line argument");
        }
    }
}