Open an existing input file and copy it to non-existing output file.

jcopy.java

public class jcopy {
   public static void main(String[] args) throws IOException {

     BufferedReader stdin = new BufferedReader( new InputStreamReader(System.in));
    
     System.out.println("enter Input File Name: ");
     String InputFile = stdin.readLine();
     File infile = new File(InputFile);
     InputStream fin = new FileInputStream(infile);

     System.out.println("enter Outut File Name: ");
     String OutputFile = stdin.readLine();
     File outfile = new File(OutputFile);
     OutputStream fout = new FileOutputStream(outfile);

     int len;
     byte[] buf = new byte[1024];
     while ((len = fin.read(buf)) > 0) {
         fout.write(buf, 0, len);
     }
     fin.close();
     fout.close();
     System.out.println("copied " + InputFile + " to " +  OutputFile);
   }
}