Why?
package com.javarush.task.task31.task3106;
import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.zip.ZipInputStream;
/*
Разархивируем файл
*/
public class Solution {
public static void main(String[] args) throws IOException {
Arrays.sort(args, 1, args.length); //сортируем
List<FileInputStream> list = new ArrayList<>();
for (int i = 1; i < args.length-1; i++) {
list.add(new FileInputStream(args[i]));
}
ZipInputStream zis = new ZipInputStream(new SequenceInputStream(Collections.enumeration(list)));
FileOutputStream fos = new FileOutputStream(args[0]);
byte[] buffer = new byte[1024 * 1024];//1MB buffer
while ((zis.getNextEntry()) != null) {
int byteBuffer;
while ((byteBuffer = zis.read(buffer)) != -1) {
fos.write(buffer, 0, byteBuffer);
}
}
fos.close();
zis.close();
}
}