Java

/*  ** a simple unZIP tool  **  ** ex.  java UnZip file.zip file1   to unzip file 1 from file.zip  **      java UnZip file.zip         to unzip file.zip   **  */  import java.io.*;  import java.util.*;  import java.util.zip.*;  import java.text.*;    class UnZip {    public static void main(String args[]) throws IOException {      InputStream in =         new BufferedInputStream(new FileInputStream(args[0]));      ZipInputStream zin = new ZipInputStream(in);      ZipEntry e;        while((e=zin.getNextEntry())!= null) {        if (args.length > 1) {          if (e.getName().equals(args[1])) {             unzip(zin, args[1]);             break;            }          }         unzip(zin, e.getName());        }      zin.close();      }      public static void unzip(ZipInputStream zin, String s)        throws IOException {      System.out.println("unzipping " + s);      FileOutputStream out = new FileOutputStream(s);      byte [] b = new byte[512];      int len = 0;      while ( (len=zin.read(b))!= -1 ) {        out.write(b,0,len);        }      out.close();      }  }