Question

How can I fix this code to accomplish the goal of reading and writing on binary or text files?

3 import java.io.*;
4 import java.io.FileOutputStream;
5 import java.io.FileInputStream;
6 import java.util.Scanner;
7
8 public class ReadAndWrite implements Serializable
9 {
10 public static void main(String[] args)
11 {
12 boolean file = true;
13 Scanner inputStream;
14 PrintWriter outputStream;
15 FileInputStream inputBinary;
16 FileOutputStream readBinary;
17 FileInputStreamText writeText;
18 FIleOutputStreamText readText;
19 StringBuffer contents = new StringBuffer();
20 Scanner keyboard = new Scanner(System.in);
21 String yn = "Y N", fileName = " ", line = " ", tb = "T B", rw = "R W";
22
23 while(file)
24 {
25 System.out.println("Enter the file name.");
26 fileName = keyboard.nextLine();
27 System.out.println("Choose binary or text file (b/t):");
28 tb = keyboard.nextLine();
29 if (tb.equalsIgnoreCase("b"))
30 {
31 System.out.println("Choose read or write (r/w):");
32 rw = keyboard.nextLine();
33 if (rw.equalsIgnoreCase("r"))
34 {
35 inputBinary = new PrinterWriter(new FileInputStream(fileName));
36 System.out.println("File contains:" + readBinary);
37 inputBinary.close();
38 }
39 else
40 {
41 System.out.println("Enter a line of information to write to the file:");
42 line = keyboard.nextLine();
43 System.out.println("Would you like to enter another line? (y/n)");
44 yn = keyboard.nextLine();
45 if(yn.equalsIgnoreCase("n"))
46 {
47 file = false;
48 }
49 }
50 }
51 }
52
53 do
54 {
55 System.out.println("Choose read or write (r/w):");
56 rw = keyboard.nextLine();
57 if (rw.equalsIgnoreCase("r"))
58 {
59 FileInputStreamText = new Scanner(new FileInputStream(outputStream + ".txt"));
60 String textLine = null;
61 }
62 else
63 {
64 System.out.println("Enter a line to write to the file:");
65 line = keyboard.nextLine();
66 System.out.println("Would you like to enter another line? (y/n)");
67 yn = keyboard.nextLine();
68 if(yn.equalsIgnoreCase("n"))
69 {
70 file = false;
71 }
72 }
73 }while(tb.equalsIgnoreCase("t"));
74 System.out.println("Process completed");
75 }
76 }

Answer 1

This program run much faster by copying a chunk of bytes at a time

import java.io.*;

public class CopyFilesChunk {

    private static final int BUFFER_SIZE = 4096; // 4KB

    public static void main(String[] args) {

        if (args.length < 2) {

            System.out.println("Please provide input and output files");

            System.exit(0);

        }

        String inputFile = args[0];

        String outputFile = args[1];

        try (

            InputStream inputStream = new FileInputStream(inputFile);

            OutputStream outputStream = new FileOutputStream(outputFile);

        ) {

            byte[] buffer = new byte[BUFFER_SIZE];

            while (inputStream.read(buffer) != -1) {

                outputStream.write(buffer);

            }

        } catch (IOException ex) {

            ex.printStackTrace();

        }

    }

}