//Example 9.8
import java.util.*;
import java.util.zip.*;
import java.io.*;
public class tt
{	
  static String zipName,fileName,entryName;
  static byte[] buffer=new byte[1024];
  static int bytesRead;
  public static void main(String args[]) throws IOException
  {
    boolean HELP=false;
    if(args.length==0)
    {
      help();System.exit(0);
    }
    if((args.length>2)&&args[0].equals("c"))
    {  HELP=true;
      zipName=args[1];
      try
      {
        ZipOutputStream zip=
            new ZipOutputStream(new FileOutputStream(zipName));
        for(int i=2;i<args.length;i++)
        {
          fileName=args[i];
          FileInputStream file=new FileInputStream(fileName);
          ZipEntry entry=new ZipEntry(fileName);
          zip.putNextEntry(entry);
          while((bytesRead=file.read(buffer))!=-1)
             zip.write(buffer,0,bytesRead);
          System.out.println(entry.getName()+"added.");
          file.close();
        }
        zip.close();
        System.out.println(zipName+" created.");
      }
      catch(IOException e){ System.out.println(e);}
    }
    if(args.length==3&&args[0].equals("x"))
    {
      HELP=true; zipName=args[1];entryName=args[2];
      try
      {
        ZipFile zip=new ZipFile(zipName);
        ZipEntry entry=new ZipEntry(entryName);
        if(entry!=null)
        {
          InputStream entryStream=zip.getInputStream(entry);
          FileOutputStream file=new FileOutputStream(entry.getName());
          while((bytesRead=entryStream.read(buffer))!=-1)
          {
            file.write(buffer,0,bytesRead);
          }
          System.out.println(entry.getName()+"extracted.");
          file.close();entryStream.close();
        }
        else
          System.out.println(entryName+" not found.");
        zip.close();
      }
      catch(IOException e){ System.out.println(e); }
    }
    if(args.length==2&&args[0].equals("l"))
    {
      HELP=true;
      try
      {
        ZipFile zip=new ZipFile(args[1]);
        for(Enumeration list=zip.entries();list.hasMoreElements();)
        {
          ZipEntry entry=(ZipEntry)list.nextElement();
          System.out.println(entry.getName());
        }
        zip.close();
      }
      catch(IOException e){ System.out.println(e); }
    }
    if(!HELP) help();
  }
  private static void help()
  {
    System.out.println("Usage:Java tt <command> <zip_file>[<file>..]");
    System.out.println(" ");
    System.out.println("<command>:");
    System.out.println("c:Create a zip file.");
    System.out.println("x:Extract files from a zip file.");
    System.out.println("l:List context of a zip file.");
    System.out.println("Examples:");
    System.out.println("java tt c myzip.zip t01.txt t02.txt");
    System.out.println("java tt x myzip.zip t01.txt");
    System.out.println("java tt l myzip.zip");
  } 
}