In Java, Write a program that reads and writes from binary or text files. Exampl

Question

In Java,

Write a program that reads and writes from binary or text files.

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.

Explanation / Answer

import java.io.BufferedReader;
import java.io.BufferedWriter;
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.OutputStreamWriter;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.omg.CORBA.portable.OutputStream;

/**
* BufferedReader and Scanner can be used to read line by line from any File or
* console in Java.
* This Java program demonstrate line by line reading using BufferedReader in Java
*
* @author Javin Paul
*/
public class Classifier {   

public static void main(String args[]) throws IOException {
   boolean flag=true;
  
   while(flag)
{
   Scanner sc=new Scanner(System.in);
  
   System.out.println("Enter file name");
   String filename=sc.nextLine();
  
   System.out.println("Choose binary or text file(b/t)");
   char ch=sc.next().charAt(0);

  
if(ch=='t')
{
  
   System.out.println("Choose read or write(r/w):");
   char rw=sc.next().charAt(0);
  
   if(rw=='w')
   {
      
   File fout = new File(filename);
   FileOutputStream fos = new FileOutputStream(fout);
   BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));

   for (;; ) {
      
       System.out.println("Enter a line of information to write to the file:");
       Scanner sc1=new Scanner(System.in);
       String s=sc1.nextLine();
       bw.write(s);
       bw.newLine();
       System.out.println("Would you like to enter another line? Y/N only");
       char ch1=sc1.next().charAt(0);
       if(ch1=='y')
           continue;
       else
           break;
   }

   bw.close();
  
   }
   else
   {
  
FileInputStream fis = null;
BufferedReader reader = null;
  
try {
fis = new FileInputStream(filename);
reader = new BufferedReader(new InputStreamReader(fis));
  
System.out.println("Reading File line by line using BufferedReader");
  
String line = reader.readLine();
while(line != null){
System.out.println(line);
line = reader.readLine();
}   
  
} catch (FileNotFoundException ex) {
// Logger.getLogger(Classifier.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
// Logger.getLogger(Classifier.class.getName()).log(Level.SEVERE, null, ex);
  
} finally {
try {
reader.close();
fis.close();
} catch (IOException ex) {
Logger.getLogger(Classifier.class.getName()).log(Level.SEVERE, null, ex);
}
}
   }
}
  
  
else
{

   System.out.println("Choose read or write(r/w):");
   char rw=sc.next().charAt(0);
  
   if(rw=='w')
   {
  
   FileOutputStream out = null;
     
   try{
   out = new FileOutputStream(filename);
  

       for (;; ) {
      
       System.out.println("Enter a line of information to write to the file:");
       Scanner sc11=new Scanner(System.in);
       String ss=sc11.nextLine();
       byte[] totalBytes = ss.getBytes();
       out.write(totalBytes);
       System.out.println("Would you like to enter another line? Y/N only");
       char ch1=sc11.next().charAt(0);
       if(ch1=='y')
           continue;
       else
           break;
   }
     
   }
   finally{
   if(out !=null)
   out.close();
   }

   }

   else
   {
  

try {
// Use this for reading the data.
byte[] buffer = new byte[1000];

FileInputStream inputStream =
new FileInputStream(filename);

// read fills buffer with data and returns
// the number of bytes read (which of course
// may be less than the buffer size, but
// it will never be more).
int total = 0;
int nRead = 0;
while((nRead = inputStream.read(buffer)) != -1) {
// Convert to String so we can display it.
// Of course you wouldn't want to do this with
// a 'real' binary file.
System.out.println(new String(buffer));
total += nRead;
}   

// Always close files.
inputStream.close();

}
catch(FileNotFoundException ex) {
  
}
catch(IOException ex) {

}
  
   }
  
  
  
  
  
  
}
System.out.println("Continue(y/n)");
Scanner ssss=new Scanner(System.in);
char re=ssss.next().charAt(0);
if(re=='n')
   flag=false;

}
  
  System.out.println("Process Completed");
}
  
  
  

}

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