import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
import java.util.stream.Collectors;

public class Main {


    public static void main(String[] args) {

       
        String[] fileContents = getFileContents("nums.txt");
        for(int i = 0; i < fileContents.length; i++) {
        	System.out.println(fileContents[i]);
        }
        writeArrayToFile("output.txt", fileContents);

     } // main

     //  reads fileName and returns the contents as String array
     //  with each line of the file as an element of the array
     public static String[] getFileContents(String fileName){
    	 String [] content = null;  
    	 try {
    		// Read the lines from the file and collect them into a list
             List<String> lines = Files.lines(Paths.get(fileName))
                     .collect(Collectors.toList());

             // copy the lines from the list into a 1D array
             content = lines.toArray(new String[0]);

             
         } catch (IOException e) {
        	 System.out.println("File Read Error");
             e.printStackTrace();
         }
    	 
        return content;

     } // getFileContents

     // writes the array a to fileName, one array element per line in the file
     public static void writeArrayToFile(String fileName, String [] a) {

    	 // this is called a try-with-resources
    	 // it automatically closes the resource when
    	 // the program is done with it
    	 try (FileWriter writer = new FileWriter(fileName)) {

    		 // Write each line followed by a newline character
    		 for (String line : a) {
                 writer.write(line + "\n");
             }
         } catch (IOException e) {
        	 System.out.println("File Write Error");
             e.printStackTrace();
         }      
     } // writeArrayToFile


}  // FileInputOutput