import net.lingala.zip4j.ZipFile;
import net.lingala.zip4j.exception.ZipException;
import java.io.IOException;

public class SampleClass{

  public static void main(String[] args)
                     throws ZipException,
                             IOException{
    ZipFile zip = null;
    
    try{
      zip = new ZipFile
      ("myzip.zip");
      zip.renameFile
      ("image1.jpg", "img1.jpg");
    }
    finally{
      if(zip != null)
        zip.close();
    }
    
    System.out.println("main thread end.");
  }
}