Decompress a zip file using ZipFile in Java

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import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class Main {
  public static void main(String[] args) throws Exception {
    String zipname = "data.zip";
    ZipFile zipFile = new ZipFile(zipname);
    Enumeration enumeration = zipFile.entries();
    while (enumeration.hasMoreElements()) {
      ZipEntry zipEntry = (ZipEntry) enumeration.nextElement();
      System.out.println("Unzipping: " + zipEntry.getName());
      BufferedInputStream bis = new BufferedInputStream(zipFile.getInputStream(zipEntry));
      int size;
      byte[] buffer = new byte[2048];
      BufferedOutputStream bos = new BufferedOutputStream(
          new FileOutputStream(zipEntry.getName()), buffer.length);
      while ((size = bis.read(buffer, 0, buffer.length)) != -1) {
        bos.write(buffer, 0, size);
      }
      bos.flush();
      bos.close();
      bis.close();
    }
  }
}