Really need help
package com.codegym.task.task18.task1818;
/*
Two in one
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String name1 = reader.readLine();
String name2 = reader.readLine();
String name3 = reader.readLine();
reader.close();
FileOutputStream out1 = new FileOutputStream(name1);
FileInputStream in2 = new FileInputStream(name2);
FileInputStream in3 = new FileInputStream(name3);
byte[] buffer = new byte[in2.available()];
int count = in2.read(buffer);
out1.write(buffer, 0, count);
buffer = new byte[in3.available()];
count = in3.read(buffer);
out1.write(buffer, 0, count);
out1.close();
in2.close();
in3.close();
}
}