Copy file without retyping its name

Question

I`m just starting to use Java (in school) so I need help even with simple things like this: I have to copy file without retyping its name in destination. I`ve tried to use substring method for extracting filename, but it gives me an error "The method substring() is undefined for type Copy". Any help?
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
public class Copy{
     * @param args
     public static void main(String[] args) {
          try {
               BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
//Entering the path to the file that I want to copy
               System.out.println("Enter file path");
               String filePath= br.readLine();
//Entering the destination for copied file
               System.out.println("Enter destination");
               String destination = br.readLine();
               FileInputStream fis = new FileInputStream(filePath);
               FileOutputStream fos = new FileOutputStream(destination);
               int c=0;
               while((c=fis.read())!=-1){
                    fos.write(c);
               fis.close();
               fos.close();
          } catch (FileNotFoundException e) {
               e.printStackTrace();
          } catch (IOException e) {
               e.printStackTrace();
}

Answer 1

cereal_killer wrote:
No. I expected this (String fileName = substring(filePath.lastIndexOf("/")+1, filePath.length());) to workYou didn't provide a string reference on which to execute substring. As in:
String str = "blah blah blah";
String fileName = str.substring(...);
{code}If you just say *substring(start, end)* how is it supposed to know *which* String object to operate on?
Without the someStringReference. preceding it, calling a method--in your case substring--is like calling it on this object, i.e., like this.substring. Your class does not define a substring method, so it's a compile time error to try to call that non-existent method.