File concatenating program does not work

Question

Hello, im quite new to java therefore it may only be a simple solution.
The program reads mulitple files off the command line and then should join them up (concatenate) in a new file called "NewFile".
The problem is it only prints the content of one of the files to the new file.
Here is my code:
/*Write an application which concatenates files. The name of
*each file is supplied on the command line. The output file
*consists of all the contents of the first file, followed by
*all the contents of the second file, and so on. One of the
*slides in the lecture may help.
import java.util.*;
import java.io.*;
public class Concatenate
     public void process (String[] argStrings) throws Exception
          String fileName = argStrings[0];
          String contents = null;
          System.out.println();
          System.out.println("Conatenated contents of files:");
          System.out.println();
          for (int index = 0; index < argStrings.length; index++)
               Scanner sc = new Scanner(new File(argStrings[index]));
               contents = sc.nextLine();
            System.out.println(contents);
               sc.close();
          PrintStream output = new PrintStream("NewFile.txt");
          output.println(contents);
        output.close();
}Thanks anyone
John

Answer 1

// put this before the for loop
PrintStream output = new PrintStream("NewFile.txt");
// put this inside the for loop
output.println(contents);Now, do you understand why you have to do that?