VM02/src/samples/Copy.java

//
// Sample class to copy a file
//
import java.io.*;

class Copy
{
    public static void main(String args[])
    {
        InputStream  input  = System.in;        
        OutputStream output = System.out;        
        if (args.length > 0)
        {
            try
            {
                input = new FileInputStream(args[0]);
            }
            catch (FileNotFoundException e)
            {
                System.err.println("Unable to open file: " + args[0]);
                System.exit(-1);
            }
            catch (IOException e)
            {
                System.err.println("Unable to access file: " + args[0]);
                System.exit(-1);
            }
        }
        if (args.length > 1)
        {
            try
            {
                output = new FileOutputStream(args[1]);
            }
            catch (FileNotFoundException e)
            {
                System.err.println("Unable to open file: " + args[1]);
                System.exit(-1);
            }
            catch (IOException e)
            {
                System.err.println("Unable to access file: " + args[1]);
                System.exit(-1);
            }
        }
        byte buffer[] = new byte[512];
        int  len;
        try
        {
            while ((len = input.read(buffer)) > 0)
                output.write(buffer, 0, len);
        }
        catch (IOException e)
        {
            System.err.println("Error copying file");
        }
        finally
        {
            input.close();
            output.close();
        }
    }
}