Keskustelu: Ohjelmointikysymykset: Java ei pysty luomaan uusia kansioita?

package minecraftmodinstaller;

import java.io.*;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;


public class MinecraftModInstaller {

    static double version = 0.1;
    static Scanner scanner = new Scanner(System.in);
    static ZipInputStream zin = null;
    static FileInputStream in = null;
    static ZipEntry[] ZipEntrys = null;

    public static void main(String[] args) throws FileNotFoundException {
        try {
            System.out.println("\n\t\tAutomaattinen Modin asentajaa Minecrafttiin\n\t\t\t\t\t\t       v"+version+"\n\n\n<------------------------------------------------------------------------------>\n");
            System.out.print("\t\tAnna modin polku: ");
            String modpath = scanner.nextLine();
            System.out.println();
            try {
                in = new FileInputStream(modpath);
                zin = new ZipInputStream(in);
            } catch(FileNotFoundException e){
                System.out.println("\t\tTiedostoa ei löydy!");
                System.exit(0);
            }
            System.out.println("\n<------------------------------------------------------------------------------>\n");

            ZipEntry ze;
            System.out.println("\t\tModi sisältää seuraavat tiedostot:");
            //try {
                while((ze = zin.getNextEntry()) != null){
                    System.out.println("\t\t\t["+ze.getName()+"]");
                }
                System.out.println("\n\t\tPuretaan tiedostoja kansioon %APPDATA%\\.minecraft\\");

                String appdatad = "";
                String osname = System.getProperty("os.name");
                String userd = System.getProperty("user.home");

                switch(osname){
                    case "Windows 7":
                    case "Windows Vista":
                        appdatad = userd+"\\AppData\\Roaming";
                        break;
                    case "Windows XP":
                    case "Windows 2000":
                        appdatad = userd+"\\Application Data";
                }
                System.out.println("-----");
                zin.close();
                in.close();

                in = new FileInputStream(modpath);
                zin = new ZipInputStream(in);

                while((ze = zin.getNextEntry()) != null){
                    String name = appdatad+"\\.minecraft\\"+ze.getName().replace('/', '\\');
                    System.out.println(name);
                    System.out.println(!name.endsWith("\\"));
                    if(!name.endsWith("\\")){
                    try (FileWriter fw = new FileWriter(new File(name))) {
                        fw.write("");
                        fw.flush();
                    }

                        FileOutputStream outf = new FileOutputStream(name);
                        byte[] buff = new byte[4096];
                        int len;
                        while ((len = zin.read(buff)) > 0) {
                            outf.write(buff, 0, len);
                        }
                        System.out.println(name);
                        outf.close();
                    } else{
                        System.out.println(new File(name).mkdirs();
                        System.out.println("Luodaan kansiota!");
                    }
                }

            //} catch (IOException ex) {
            //    System.out.println("!!! VIRHEELLINEN ZIP-TIEDOSTO !!!");
            //}
        } catch (IOException ex) {
            Logger.getLogger(MinecraftModInstaller.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}