import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

public class Copy {

/* Command::

copy nameA nameB where nameA and nameB must be the name of a files and their paths.

Action:

Copies file nameA to file nameB.

Errors:

The user enters:

1. copy Does not type the file names.

2. copy name Did not type a second file name.

3. copy nameA nameB but the file nameA does not exist.

4. copy nameA nameB but the file nameB alreadyexist.

5. copy nameA nameB but nameA is a directory.

6. copy nameA nameB but the file is a directory.

When there is an error println a message and return (not exit).

*/

public Copy(String name) {

f(name);

}

static void f(String name) {

try {

// splitting the data type string to get to names

String[] names = name.split(" ");

//creating a new object for the file class to get the first file name

File f1 = new File(names[0]);

// Prints the

//System.out.println(names[0]);

//creating a new object for the file class to get the second file name

File f2 = new File(names[1]);

//System.out.println(names[1]);

//class creates an InputStream that you can use to read bytes from a file

InputStream in = new FileInputStream(f1);

//class creates an OutputStream that you can use to write bytes to a file

OutputStream out = new FileOutputStream(f2);

// the array of bytes is created and read 1024 bytes at a time.

byte [] buf = new byte[1024];

// declaring the length of an array

int len;

// This loop continues to read the buf array of the txt file and stops when its equal to zero

// len => length of the array gets how much bytes it get backs each time something is read from the file

while ((len = in.read(buf)) > 0) {

// if the value returned is zero then it is end of the file and

//it is written to the output file

out.write(buf,0,len);

}

//Since it is done copying closing the inputStream

in.close();

// closing the outputStream

out.close();

// Prints that the file is successfully copied

System.out.println("File Copied");

// exception found

} catch (FileNotFoundException e) {

// throwing error that the file does not exists

System.out.println("The File does not exits");

// If the input is empty then trying to catch the array Indexoutofboundexception

} catch (ArrayIndexOutOfBoundsException e) {

// throwing error if the input is empty

System.out.println("The input NOT GIVEN");

// If the user does not type the input then trying to catch IOException

} catch (IOException e) {

// throwing error when the user does not type the file name

System.out.println("The user does not type the file name");

}

}

}