what i did wrong? can someone give me few clues?

package pl.codegym.task.task18.task1820; /* Zaokrąglanie liczb */ import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.lang.reflect.Array; import java.util.ArrayList; import java.util.Arrays; import java.util.Scanner; public class Solution { public static void main(String[] args) throws IOException { Scanner scanner = new Scanner(System.in); String file1 = scanner.nextLine(); String file2 = scanner.nextLine(); scanner.close(); FileInputStream inputStream = new FileInputStream(file1); FileOutputStream outputStream = new FileOutputStream(file2); ArrayList<Float> floats = new ArrayList<>(); ArrayList<Integer> kurwa = new ArrayList<>(); String jajebie = null; byte[] bytes = new byte[inputStream.available()]; inputStream.read(bytes); String inputString = ""; for (byte b : bytes) { inputString += (char) b; } for (String s : inputString.split(" ")) { floats.add(Float.valueOf(s)); } for (int i = 0; i < floats.size(); i++) { if (floats.get(i) > 0) { int round = Math.round(floats.get(i)); kurwa.add(round); } else { int a = (int) (floats.get(i) - 0.5); kurwa.add(a); } } for (Integer integer : kurwa) { jajebie += String.valueOf(integer) + " "; } String ostatecznaKurva = jajebie.substring(0, jajebie.length() - 1); outputStream.write(ostatecznaKurva.getBytes()); inputStream.close(); outputStream.close(); } }