Валидатор утверждает, что выводит что-то лишнее, хотя вывод идет по условию. Замучился...

package com.javarush.task.task16.task1630; import java.io.*; public class Solution { public static String firstFileName; public static String secondFileName; static { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); try { firstFileName = reader.readLine(); } catch (IOException e) { e.printStackTrace(); } try { secondFileName = reader.readLine(); } catch (IOException e) { e.printStackTrace(); } try { reader.close(); } catch (IOException e) { e.printStackTrace(); } } public static void main(String[] args) throws InterruptedException { systemOutPrintln(firstFileName); systemOutPrintln(secondFileName); } public static void systemOutPrintln(String fileName) throws InterruptedException { ReadFileInterface f = new ReadFileThread(); f.setFileName(fileName); f.start(); f.join(); System.out.println(f.getFileContent()); } public interface ReadFileInterface { void setFileName(String fullFileName); String getFileContent(); void join() throws InterruptedException; void start(); } public static class ReadFileThread extends Thread implements ReadFileInterface { private String str = ""; @Override public void setFileName(String fullFileName) { this.setName(fullFileName); } @Override public String getFileContent() { return this.str; } public void run(){ BufferedReader reader1 = null; try { reader1 = new BufferedReader( new FileReader(Thread.currentThread().getName())); } catch (FileNotFoundException e) { e.printStackTrace(); } String line = null; StringBuffer stringBuilder = new StringBuffer(); String ls = " "; //System.getProperty("line.separator") try { while( ( line = reader1.readLine() ) != null ) { stringBuilder.append( line ); stringBuilder.append( ls ); } } catch (IOException e) { e.printStackTrace(); } try { reader1.close(); } catch (IOException e) { e.printStackTrace(); } stringBuilder.deleteCharAt(stringBuilder.length()-1); str = stringBuilder.toString(); } } }