Question

I need help with my assignment. It is a java program. Please make it as simple as you can. Create an ArrayList with elements the objects of previous class. Using a simple loop populate the ArrayList with data from some arrays with data, or from console. Use a loop with iterator and write the information in a File using PrintWriter. Use this address for the file (c:\\result\\MyData.txt). Use the Scanner class to display the content of the file on console.

Answer 1

Hi, thanks for posting the question.

I have show as how you can write to a file using PrintWriter and use Scanner to read from a file and print the contents in the console.

Refer the screenshot given at the end :)

_____________________________________________________________________________________________

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

public class WriteAndRead {

    //from some arrays with data
    private static String[] cities = {"Washington", "New York", "California",
            "Denver", "Paris", "Log Angeles"};

    public static void main(String[] args) {
        //Create an ArrayList with elements the objects
        ArrayList<String> cityArrayList = new ArrayList<>();
        //Using a simple loop populate the ArrayList with data
        for (String city : cities) {
            cityArrayList.add(city);
        }
        //Use this address for the file (c:\result\MyData.txt).
        File file = new File("F:\result\MyData.txt");
        try {
            //Use a loop with iterator and write the information in a
            // File using PrintWriter.
            PrintWriter writer = new PrintWriter(file);
            for (String city : cityArrayList) {

                writer.write(city + "
");
            }
            writer.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        try {
            //Use the Scanner class to display the content of the file on console.
            Scanner scanner = new Scanner(file);
            while (scanner.hasNextLine()) {
                System.out.println(scanner.nextLine());
            }

            scanner.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }


}

_____________________________________________________________________________________________

or (string city: cityarrayList 27 28 29 30 31 32 writer.rite( city"n") writer.close ) catch (FileNotFoundException e) e.printStackTrace MyData.tot - Notepad try 34 35 36 37 38 39 40 41 42 4.3 File Edit Format ieHelp Washington New York California Denver Paris Log Angeles //Use the Scanner class to display the content of the tile on cansole Scanner scanner-new Scanner (file); while (scanner.hasNextLine)) I System. out.printin (scanner.nextLine ) scanner.close (0 1 catch (FileNotFoundException e) I e.printStackTrace Triad main0 "C:\Program FilesvalJdk-11\binljava.exe"-avaagent:C:Program Files JetBrains\Intel1i IDEA Community Edition 2018.2.411iblidea rt.Jar-52159:C:\Program File Washington ↓ New York California Denver Paris ē Log Angeles Process finished with exit code 0 5: Debug 6 TODO Terminal4 Run

Thank you, incase you have any problem do let me know !!