подскажите, где ошибка
package com.javarush.task.task16.task1630;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
/*
Последовательный вывод файлов
*/
public class Solution {
public static String firstFileName;
public static String secondFileName;
static {
Scanner scanner = new Scanner(System.in);
firstFileName = scanner.nextLine();
secondFileName = scanner.nextLine();
scanner.close();
}
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 StringBuilder fileContent;
private String fileName;
@Override
public void setFileName(String fullFileName) {
fileName = fullFileName;
}
@Override
public void run() {
try(BufferedReader reader = new BufferedReader(new FileReader(fileName))){
while (reader.ready()) {
fileContent.append(reader.readLine() + " ");
}
}catch (IOException e){
}
}
@Override
public String getFileContent() {
if (fileContent == null) {
return "";
}
return fileContent.toString();
}
}
}