File Input Output Java

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  4. Retrieves the manifest from a JAR file and writes the manifest contents to a file
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
public class Main {
  public static void main(String[] argv) throws Exception {
    JarFile jarfile = new JarFile("filename.jar");
    Manifest manifest = jarfile.getManifest();
    OutputStream fos = new FileOutputStream("manifest");
    jarfile.getManifest().write(fos);
    fos.close();
  }
}