import java.io.*;						// need File, PrintWriter and IOException
import java.util.Scanner;

// this program will input all of the Strings from a file and output them to a second file using an array to store them temporarily

public class FileReaderWriter
{
	public static void main(String[] args) throws IOException
	{
		Scanner in = new Scanner(System.in);						// use a Scanner to get keyboard input for the file names
		System.out.print("Enter the input file name:  ");
		String file1 = in.next();									// input file name
		System.out.print("Enter the output file name:  ");
		String file2 = in.next();									// output file name
		String[] list = getInput(file1);							// getInput will input from file1 and return it as an array
		sendOutput(list, file2);									// sendOutput will take the array and output its contents to file2
	}
	
	public static String[] getInput(String inputFile) throws IOException	// method to input from inputFile and store in a String array, returning a version
	{																		// of the String array whose size matches the number of inputs
		Scanner infile = new Scanner(new File(inputFile));			// open the Scanner (File)
		String[] list = new String[1000];							// assume no more than 1000 Strings
		int n = 0;													// n is the number of input Strings to this point, used to resize the array later
		while(infile.hasNext()&&n<1000) 							// input while the input file is not empty and we haven't reached 1000 Strings
			list[n++] = infile.next();
		infile.close();												// close the input file
		if(n==1000) System.out.println("Array full, cannot read any more");	// warn user if array is full
		String[] list2 = new String[n];								// create a second String array whose size is exactly n
		for(int i=0;i<n;i++) list2[i] = list[i];					// copy original array's contents into new array and return new array
		return list2;
	}
	
	public static void sendOutput(String[] list, String outputFile) throws IOException	// given a String array and a filename, open the file and output the array's contents there
	{
		PrintWriter outfile = new PrintWriter(new File(outputFile));	// create the PrintWriter to output to outfileFile
		for(int i=0;i<list.length;i++)									// for every String in the array
			outfile.println(list[i]);									// output it to the PrintWriter (File)
		outfile.close();												// close the file
	}
}