3456 попыток, в итоге переделывал 1000 раз и превышен лимит времени.

byte[] buffer = new byte[4096];
int count;
while ((count = zipInputStream.read(buffer)) != -1) {
    fileOutputStream.write(buffer, 0, count);
}

zipInputStream.available()>0

zipInputStream.skipNBytes(4);

zipinputstream.skip(4);

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.ZipEntry;
import java.util.zip.ZipInputStream;

/*
Разархивируем файл
*/

public class Solution {
    public static void main(String[] args) throws IOException {
       // String [] args2 = {"1", "D:/32565.z01", "D:/32565.z02", "D:/32565.z03"};
        String fileName = args[0];
        List<String> names = new ArrayList<>();
        names.addAll(Arrays.asList(args).subList(1, args.length));
        Collections.sort(names);
        List<FileInputStream> inputStreams = new ArrayList<>();
        for (String allNames : names) {
            inputStreams.add(new FileInputStream(allNames));
        }
        ZipInputStream zipInputStream = new ZipInputStream(new SequenceInputStream(Collections.enumeration(inputStreams)));
        FileOutputStream fileOutputStream = new FileOutputStream(fileName);
        ZipEntry zipEntry;
        zipInputStream.skip(4);
                while ((zipEntry = zipInputStream.getNextEntry())!= null){
            for (int c = zipInputStream.read(); c != -1; c = zipInputStream.read()) {
                fileOutputStream.write(c);
            }
} zipInputStream.close();
fileOutputStream.close();
}
}

private static void readFileData(ZipInputStream zis, FileOutputStream fos)
        throws IOException {
    byte[] buffer = new byte[4096];
    int count;
    while ((count = zis.read(buffer)) != -1) {
        fos.write(buffer, 0, count);
    }
}

zipInputStream.getNextEntry();
readFileData(zipInputStream, fileOutputStream);

int count = 0;
while (zipInputStream.getNextEntry() != null) {
    readFileData(zipInputStream, new FileOutputStream(fileName + count++));
}

private static void checkSpannedSignature(InputStream is) throws IOException {
    PushbackInputStream pbis = new PushbackInputStream(is);
    byte[] ZIP_SPANNED_SIGNATURE = { 0x50, 0x4B, 0x07, 0x08 };
    byte[] startBytes = new byte[4];

    pbis.read(startBytes);

    if (!Arrays.equals(startBytes, ZIP_SPANNED_SIGNATURE)) {
        pbis.unread(startBytes);
    }
}

checkSpannedSignature(inputStreams.get(0));