Question

Using Java how would I write a program that reads and writes from binary or text files and gives me an output similar to this?

Example Output:

--------------------Configuration: <Default>--------------------

Enter the file name: kenb

Choose binary or text file(b/t): b

Choose read or write(r/w): w

Enter a line of information to write to the file:

lasdklj

Would you like to enter another line? Y/N only

n

Continue? (y/n)y

Enter the file name: kenb

Choose binary or text file(b/t): b

Choose read or write(r/w): r

File contains:

lasdklj

Continue? (y/n)y

Enter the file name: kent

Choose binary or text file(b/t): t

Choose read or write(r/w): w

Enter a line of information to write to the file:

OOP

Would you like to enter another line? Y/N only

Y

Enter a line of information to write to the file:

Java, C++ not C.

Would you like to enter another line? Y/N only

n

Continue? (y/n)y

Enter the file name: kent

Choose binary or text file(b/t): t

Choose read or write(r/w):r

File contains:

OOP

Java, C++ not C.

Continue? (y/n)n

Process completed.

Answer 1

/*****************************************WriteToBinaryOrText.java******************************/

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Scanner;

public class WriteToBinaryOrText {

   public static void main(String[] args) {

       Scanner scan = new Scanner(System.in);
       char exit = ' ';
       do {
           System.out.print("Enter the file name: ");
           String fileName = scan.nextLine();
           System.out.print("Choose binary of text file(b/t): ");
           char fileType = scan.nextLine().toLowerCase().charAt(0);
           System.out.print("Choose read or write(r/w): ");
           char option = scan.nextLine().toLowerCase().charAt(0);

           if (fileType == 'b') {

               if (option == 'r') {

                   readBinaryFile(fileName);

               } else {

                   writeToBinaryFile(fileName);
               }
           } else {

               if (option == 'r') {

                   readTextFile(fileName);
               } else {

                   writeToTextFile(fileName);
               }
           }

           System.out.print("Continue? (y/n): ");
           exit = scan.nextLine().toLowerCase().charAt(0);
       } while (exit != 'n');
      
       System.out.println("Process completed.");

   }

   public static void readTextFile(String fileName) {

       try {
           Scanner scan = new Scanner(new File(fileName + ".txt"));
           System.out.println("File contains: ");
           while (scan.hasNextLine()) {

               System.out.println(scan.nextLine());
           }

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

   }

   public static void writeToTextFile(String fileName) {

       Scanner scan = new Scanner(System.in);
       try {
           char option = ' ';
           PrintWriter pt = new PrintWriter(new File(fileName + ".txt"));
           do {
               System.out.println("Enter a line of information to write to the file:");
               String line = scan.nextLine();
               pt.println(line);
               System.out.println("Would you like to enter another line? Y/N only");
               option = scan.nextLine().toLowerCase().charAt(0);
           } while (option != 'n');
           pt.flush();
           pt.close();

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

   public static void readBinaryFile(String fileName) {

       fileName = fileName + ".dat";

       try {
           FileInputStream fileInputStream = new FileInputStream(fileName);

           // specify UTF-8 encoding explicitly
           InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "UTF-8");

           BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
           String line;
           System.out.println("File contains: ");
           while ((line = bufferedReader.readLine()) != null) {
               System.out.println(line);
           }
           bufferedReader.close();
       } catch (Exception e) {

           System.out.println(e);
       }
   }

   public static void writeToBinaryFile(String fileName) {

       Scanner scan = new Scanner(System.in);
       try {

           char option = ' ';
           FileOutputStream outputStream = new FileOutputStream(fileName + ".dat");
           do {
               System.out.println("Enter a line of information to write to the file:");
               String bytes = scan.nextLine()+"\n";
               byte[] buffer = bytes.getBytes();
               outputStream.write(buffer);
               System.out.println("Would you like to enter another line? Y/N only");
               option = scan.nextLine().toLowerCase().charAt(0);
           } while (option != 'n');
           // Always close files.
           outputStream.close();

       } catch (IOException ex) {
           System.out.println("Error writing file '" + fileName + "'");

       }
   }
}
/***********************output**********************/

Enter the file name: kenb
Choose binary of text file(b/t): b
Choose read or write(r/w): w
Enter a line of information to write to the file:
lasdklj
Would you like to enter another line? Y/N only
N
Continue? (y/n): y
Enter the file name: kenb
Choose binary of text file(b/t): b
Choose read or write(r/w): r
File contains:
lasdklj
Continue? (y/n): y
Enter the file name: kent
Choose binary of text file(b/t): t
Choose read or write(r/w): w
Enter a line of information to write to the file:
OOP
Would you like to enter another line? Y/N only
Y
Enter a line of information to write to the file:
Java, C++ not C.
Would you like to enter another line? Y/N only
n
Continue? (y/n): y
Enter the file name: kent
Choose binary of text file(b/t): t
Choose read or write(r/w): r
File contains:
OOP
Java, C++ not C.
Continue? (y/n): n

Please let me know if you have any doubt or modify the answer, Thanks :)