Merge files to one qoutations

Main.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) {
		String FilePath = "C:\\Users\\Ivan\\Downloads\\book";

		File folder = new File(FilePath);

		File mergedFile = new File(FilePath + "\\quotations.txt");

		File[] files = folder.listFiles();

		Arrays.sort(files, new Comparator<File>() {
	            @Override
	            public int compare(File o1, File o2) {
	                return -1 * o1.getName().compareTo(o2.getName());
	            }
	        });

		mergeFiles(files, mergedFile);
	}

	public static void mergeFiles(File[] files, File mergedFile) {

		FileWriter fstream = null;
		BufferedWriter out = null;
		try {
			fstream = new FileWriter(mergedFile, true);
			out = new BufferedWriter(fstream);
		} catch (IOException e1) {
			e1.printStackTrace();
		}

		for (File f : files) {
			System.out.println("merging: " + f.getName());
			FileInputStream fis;
			try {
				fis = new FileInputStream(f);
				BufferedReader in = new BufferedReader(new InputStreamReader(fis));

				String aLine;
				while ((aLine = in.readLine()) != null) {
					out.write(aLine);
					out.newLine();
				}

				in.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		try {
			out.close();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}
}